CR24781A FIELD SUPERVISION REPORT Q0039495 £ PRINCE FOR COMALCO ALUMINIUM LIMITED CARPENTARIA SURVEY PERMIT Q/22P AND Q/23P CARPENTARIA BASIN DECEMBER 04 TO 13 1991 CONTRACTOR: HALLIBURTON GEOPHYSICAL SERVICES VESSEL M.V. MAGNIFICENT CREEK SUPERVISOR: R. ROMANIK CONTENTS TITLE 1 CONTENTS 2 GENERAL 3 FIELD PARAMETERS 5 SURVEY STATISTICS 6 NARRATIVE DIARY 7 CONCLUSION AND RECOMMENDATIONS 10 3.0 MI SCELLANEOUS 12 WEATHER 14 TIDES 15 CONTRACTUAL DISCUSSION 16 PERSONNEL 17 Seismic Crew 17 Marine Crew 18 Onshore Support 19 VESSEL SPECIFICATION 20 VESSEL SAFETY 21 RECORDING INSTRUMENTS SPECIFICATION 22 RECORDING INSTRUMENTS DESCRIPTION 23 RECORDING INSTRUMENTS DIAGRAM 27 RECORDING INSTRUMENTS TEST 28 DAILY INSTRUMENTS TEST 29 STREAMER CABLE SPECIFICATIONS 33 STREAMER CABLE DESCRIPTION 37 STREAMER CABLE AUXILIARY EQUIPMENT 38 STREAMER CABLE DIAGRAMS 40 STREAMER CABLE TESTS 41 ENERGY SOURCE SPECIFICATION 42 ENERGY SOURCE DIAGRAM 43 ENERGY SOURCE TESTS 44 ENERGY SOURCE AND OFFSET DIAGRAM 45 NAVIGATION SYSTEMS DETAILS 46 SKYFIX 46 SPHEROID 48 BATHYMETRY 49 ANTENNAE LOCATION DIAGRAM 50 DAILY SURVEY ACTIVITY DETAILS 51 DAILY SURVEY PRODUCTION 53 FIELD TAPE LOGS 56 LINE STATUS 57 LINE LOGS 58 Acknowledgment: Certain equipment technical descriptions and specifications in this report have been reproduced from Halliburton Geophysical Services' literature with permission. INTRODUCTION GENERAL This report covers the marine seismic data acquisition operations conducted by COMALCO ALUMINIUM LIMITED in the exploration permit area Q/22P and Access Authority area Q/23P in the Carpentaria Basin off the coast of Queensland in 1991. The survey operations covered in this document commenced on December 1 and ended on December 13, 1991. The survey was entitled the 1991 CARPENTARIA MARINE SEISMIC SURVEY and encompassed 2D coverage of 1643 kilometres of the sea bed. The data collection technique involved the use of a single streamer and a single tow source of 218O 3 .in. VSX sleeve exploder airguns. The contractor chosen to acquire the seismic data was HALLIBURTON GEOPHYSICAL SERVICES INC. using the vessel M.V. MAGNIFICENT CREEK. This vessel was suitably equipped to carry out the work as it had just completed a survey with the required source/strea- mer configuration. (See Appendix A.) AUSTRAL GEOPHYSICAL CONSULTANTS PTY. LTD. was selected by the operating company to supervise and report on the data acquisition operations carried out by the contractor, and to make decisions on data quality control during the course of the survey. GENERAL Navigation for the survey was subcontracted to RACAL SURVEY which provided the new SKYFIX service to relay the differential corrections for the GPS during the course of the operation. DIGICOURSE INC manufactured the streamer compasses used for the survey. FIELD PARAMETERS Survey Name Client Contractor Coverage Streamer Configuration 1991 Carpentaria Marine Seismic Survey Comalco Aluminium Limited Halliburton Geophysical Services Inc. 1643 kilometres Single 300 Trace, 12.5 metre group interval Configuration Alternate 1090 3 in. Airgun Arrays, 8.33 metres Streamer Depth Source Depth Trace Interval Shotpoint Interval Nominal Fold Sample Rate Record Length Low Cut Filter High Cut Filter Recorded Data Format Recording Density 6 metres 6 metres 12.5 metres 25 metres 60 2 milliseconds 4 seconds 8 Hz/18 dB per octave 128 Hz/72 dB

per octave SEG D Demultiplexed, Code 8015 6250 bpi SURVEY STATISTICS ACTIVITY DESCRIPTION HOURS SURVEY % Recording Line Change Streamer Handling Ancillary Instrument Failure Extended Line Change \Navi gation 150.765 56.169 1.300 10.749 4.433 67.34 25.09 .58 4.80 1.98 TOTAL 223.883 Total Subsurface Kilometres 1645.525 Total Chargeable Kilometres 1645.525 Average Kilometre Per Day 176.398 Total Chargeable Hours 4.433 Total Weather Hours 000.000 Total Days For Survey 9.32 NARRATIVE DIARY 01 December 08:00 M.V Magnificent Creek docked at Darwin's Fort Hill wharf to drop off Client Representative and allow survey equipment to be loaded aboard. 09:00 Steve Bradley from Racal Survey and Ian Macdonald from Concept Navigation board the vessel. 10:30 Rick Romanik from Austral Geophysical boarded the vessel. 11:00 Roger Meaney representing Comalco Aluminium Ltd boarded the vessel. 13:00 Additional fuel and supplies were taken aboard. 17:00 Vessel departs Darwin for prospect. 24:00 Vessel in transit to prospect at 10.5 kts. 02 December Vessel in transit to prospect at 10.5 kts. 03 December 00:00 Vessel in transit to prospect. 23:30 Arrived prospect and commenced deploying streamer. 04 December 04:35 Deploying streamer, replace a bad section. 05:30 Deploying airgun source. 05:31 Transit to Line 91CU-02. 05:57 Recording Line 91CU-02. 08:41 Completed Line 91CU-02 total 29.375 kms. 08:42 Line change. 12:15 Recording Line 91CU-01. 15:06 Completed Line 91CU-01 total 31.400 kms 15:07 Line change. 19:04 Extended Line change. 22:55 Recording Line 91CA-17 sub-total 11.00 kms. 05 December 07:21 Completed Line 91CA-17 total 72.175 kms 07:22 Line change. 09:01 Recording Line 91CA-06. 14:52 Completed Line 91CA-06 total 61.175 kms. 14:53 Line change. 16:14 Fax received confirming the relocation of Line 91CA-10. 17:03 Recording Line 91CA-08. 22:54 Completed Line 91CA-08 total 61.00 kms. 22:55 Line change. 06 December 00:23 Line change. 00:58 Line change extended, waiting navigation. 01:29 Recording Line 91CA-09, terminated due to CMS malfunction. 03:43 Recording Line 91CA-09A. 09:33 Completed Line 91CA-09A total 61.075 kms. 09:33 Line change. 11:49 Recording Line 91CA-07. 21:37 Completed Line 91CA-07 total 61.075 kms. 21:37 Line change. 24:00 Line change extended, streamer repair. NARRATIVE DIARY 07 December 01:18 Line change extended, streamer repair. 01:18 Recording Line 91CA-10. 08:43 Completed Line 91CA-10 total 79.625 kms. 08:47 Line change. 11:06 Recording Line 91CA-11. 17:44 Completed Line 91CA-11 total 68.675 kms. 17:45 Line change . 45.0 kms. 19:54 Recording Line 91CA-04. 24:00 Recording Line 91CA-04 MSP 1800, sub-total 08 December 00:00 Recording Line 91CA-04. 07:15 Completed Line 91CA-04 total 74.650 kms 07:15 Line change. 09:25 Recording Line 91CA-05. 18:06 Completed Line 91CA-05 total 91.375 kms 18:06 Line change . 23:25 Recording Line 91CA-03 terminated. 24:00 Instrument failure FCS hangup. 09 December 00:00 Instrument failure FCS hangup. 01:23 Overlap due to termination. 01:35 Recording Line 91CA-03A. 08:17 Completed Line 91CA-03A total 70.55 kms. 08:17 Line change. 10:22 Recording Line 91CA-02. 18:53 Completed Line 91CA-02 total 91.475 kms. 18:53 Line change. 21:17 Recording Line 91CA-01. 24:00 Recording Line 91CA-01 MSP 1230, sub-total 28.250 kms. December 00:00 Recording Line 91CA-01. 06:30 Completed Line 91CA-01 total 63.350 kms. 06:30 Line change. 08:55 Recording Line 91CA-12. 23:18 Completed Line 91CA-12 total 150.400 kms. December 00:00 Line change. 01:55 Recording Line 91CA-14. 08:31 Completed Line 91CA-14 total 73.525 kms. 06:30 Line change. 08:55 Recording Line 91CA-13. 18:16 Completed Line

91CA-13 total 78.00 kms. 18:16 line change. 20:58 Recording Line 91CA-15. 24:00 Recording Line 91CA-15 MSP 1410, sub-total 32.750 kms. NARRATIVE DIARY December 00:00 Recording Line 91CA-15. 11:29 Completed Line 91CA-15 total 118 kms. 11:29 Line change. 15:09 Recording Line 91CA-16. 24:00 Recording Line 91CA-16 MSP 3850, sub-total 93.750 kms. December 00:00 Recording Line 91CA-16. 01:51 Completed Line 91CA-16 total 115.8 kms. 01:51 Line change. 12:36 Recording Line 91CA-11. 13:50 Completed Line 91CA-11 total 12.725 kms. SURVEY COMPLETED TOTAL 1645.525 kilometres. 17:30 Roger Meaney, Steve Bradley and Ian Macdonald plus a data shipment departed the vessel at Weipa in Queensland. 17:31 Vessel transit to new prospect. 2.2 CONCLUSIONS AND RECOMMENDATION The M.V. Magnificent Creek and crew performed beyond predicted production figures. Their equipment was faultless. After commencing the first line, HGS was requested to record some data with 1080 in 3 , source array - half the volume that was specified in the contract. After reviewing the paper monitors, Comalco's onboard representative, Roger Meaney, decided to continue recording with the smaller array. The 1080 in 3 , array had sufficient energy to penetrate the 4 seconds, and also to assist in attenuating some of the reverberation that was saturating the records. The reverberation was not always apparent on the paper monitors, but it did come and go which may indicate that it is sea bed dependent rather than a condition of the whole area. Comalco may request HGS to assist in designing a source that would be a little bigger in volume than a 540 in 3 ., but smaller than 1080in 3 . for future surveys. The streamer length of 3000m may have been slightly long as shallow events were on top of the first arrivals at the far traces. The possibility of using a shorter streamer in the future may be discussed after the final sections are generated and interpreted. A navigation calibration was conducted in Darwin with only lm difference shown by the SkyFix Navigation System. The Racal SkyFix System was also impressive. Before the survey began, it was felt that HGS would be in a non-productive mode for two to three hours each day waiting for satellite constellations. In fact, very little time was spent on standby due to lack of satellites or due to Racal centre not communicating or relaying the differential codes. The Captain and 2nd Mate learnt very quickly how to judge when the next satellite constellation change was taking place by watching the vessel on the track plotter move slight off course. The distance that the vessel travelled during these constellation changes varied between 25 metres in the lateral dimension to more than 1 kilometre in a forward direction. However, the vessel did not deviate from the pre-plotted heading. A differential correction data station at Weipa for future surveys may eliminate some of the abrupt changes in corrections that HGS experienced. Experimenting was kept at a minimum, since the data was fair to good from previous surveys and HGS could only try different source array volumes and streamer depths. If Comalco is returning to this area to do some infill, a Real Time Processor would be an asset to the operation. Having the option of evaluating certain parameters and the opportunity of moving lines would be a big plus in the acquisition of data in future survey. CONCLUSIONS AND RECOMMENDATION The VSX Sleeve guns array performed very well as there was no downtime for source array during the survey. The airgun mechanics were also very impressive and put in a lot of hard work between line changes to guarantee that the array never fell below specifications. The data quality from the paper monitors was very

good in terms of both the freguency content and the signal to noise ratio. All cable depth controllers functioned very well during the survey. HGS had very little standby time waiting on satellite for the SkyFix system to update the vessel position. While the survey was too short for me to fully assess the crew, or to recommend any organisational improvements, the HGS crew appeared experienced and very safety conscious. 3.1. MISCELLANEOUS BEAUFORT WIND SCALE (For an effective height of 10 metres above sea level) No DESCRIP TION MEAN WIND SPEED KNOTS M/SEC DEEP SEA CRITERION PROBABLE MEAN WAVE HT. (M.) 0 Calm <1 0-0.2 Sea like a mirror 1 Light-air 1-3 0.3-1.5 Ripples with appearance of scales are formed, but without foam crests 0.1 2 Light breeze 4-6 1.6-3.3 Small wavelets, still short but more pronounced, crests have a glassy appear ance but do not break 0.2 3 Gentle breeze 7-10 3.4-5.4 Large wavelets, crests begin to break, foam of glassy appearance perhaps scat tered white horses. 0.6 4 Moderate breeze 11-16 5.5-7.9 Small waves becoming longer, fairly fre quent white horses 1 5 Fresh breeze 17-21 8.0-10.7 Moderate waves, taking a more pronounced long form, many white horses are formed (chance of spray) 2 6 Strong breeze 22-27 10.8-13.8 Large waves beginning to form, white foam crests more extensive everywhere (probably some spray) 3 7 Near gale 28-33 13.9-17.1 Sea heaps up and white foam from break ing waves begins to be blown in streaks along direction of wind 4 8 Gale 34-40 17.2-20.7 Moderately high waves of greater length, edges of crests begin to break into spi ndrift,foam is blown in well marked streaks along direction of the wind 5.5 9 Strong gale 41-47 20.8-24.4 High waves, dense streaks of foam along the direction of wind, crests of spray begin to topple, tumble and roll over, spray may effect visibility 7 10 Storm 48-55 24.5-28.4 Very high waves with long overhanging crests, resulting foam in great patches, is blown in dense white streaks along direction of wind, surface of sea takes a white appearance,tumbling of sea becomes heavy and shock like. 9 11 Violent storm 56-63 28.5-32.6 Exceptionally high waves (small and medium sized ships might be lost to view behind the waves) sea completely covered with long white patches of foam lying along direction of wind everywhere the edges of the wave crests are blown into froth, visibility affected 11.5 12 Hurricane >63 >32.7 The air is filled with foam and spray, sea completely white with driven spray, visibility very seriously affected 14 3.1.1 MISCELLANEOUS CODES TO SEA, SWELL AND VISIBILITY STATES STATE SEA SWELL HEIGHT (metres) VISIBILITY (nm) 0 Glassy No swell <1 <0.03 1 Rippled Very slight <1 0.03 2 Wavelets Slight <1 0.1 3 Slight Low <1 0.3 4 Moderate Moderate 1-4 0.5 5 Rough Fairly heavy 1-4 1.1 6 Very Rough Heavy 1-4 2.2 7 High Very heavy >4 5.4 8 Very High Phenomena I >4 11 9 Phenomena I >4 >27 CR24781A DAILY WEATHER WEATHER DATE A.M. P.M. WIND SEA SWELL WIND SEA SWELL 01/12 2 2 SLIGHT 2 2 SLIGHT 02/12 2 1 VERY SLIGHT 2 2 SLIGHT 03/12 3 2 SLIGHT 3 2 SLIGHT 04/12 3 3 LOW 3 3 LOW 05/12 3 3 LOW 3 3 LOW 06/12 3 3 LOW 3 3 LOW 07/12 4 3 LOW 4 3 LOW 08/12 4 3 LOW 4 3 LOW 09/12 4 3 LOW 4 3 LOW 10/12 5 4 MODERATE 5 4 MODERATE 11/12 5 4 MODERATE 5 4 MODERATE 12/12 3 3 WAVELETS 3 2 SLIGHT 13/12 3 3 WAVELETS 3 3 WAVELETS TIDE TABLES TIDE TABLE DATE HIGH WATER A.M HIGH WATER P.M HOURS HEIGHT(M) HOURS HEIGHT (M) DECEMBER 01 0055 1424 2.6 02 0125 - 1451 2.7 03 0215 1.9 1510 2.7 04 0334 1.9 1529 2.7 05 0415 - 1549 2.8 06 0527 - SP 1614 2.8 Sp 07 0624 - 1638 2.8 08 0858 2.1 1702 2.8 09 0921 2.2 1730 2.8 10 1000 2.2 1801 2.7 11 1055 2.2 1836 2.7 12 -

1914 2.6 13 1253 2.3 1957 2.4 14 1304 2.4 2055 2.2 Np 15 1315 2.5 2231 2.1 16 - 1323 2.5 17 0050 1.9 1334 2.6 18 0252 2.0 1346 2.7 19 0445 2.0 1406 2.8 20 0538 2.1 1436 2.9 21 0658 2.2 1514 3.0 22 0740 2.3 1559 3.1 23 0816 2.3 1649 3.1 Sp 24 0900 2.3 1745 3.1 25 0945 2.3 1843 3.0 26 1031 2.4 1945 2.8 27 1119 2.5 2046 2.6 28 1203 2.6 2153 2.3 29 1243 2.7 2316 2.1 30 - 1315 2.8 31 0500 2.0 Np 1343 2.8 Time Zone 1000 Times and Height of High Water Year 1991 The above table is for the Gulf of Carpentaria-Weipa (Evans Landing) at Latitude 12°41'S and Longitude 141°53'E. CONTRACTUAL DISCUSSION The parameters and requirements for this survey had been discussed in general terms with the Comalco Geophysicist, and Roger Meaney was aboard the vessel for any contractual discus sion. 02/12 Facsimile advising that the vessel is in transit to prospect with an E.T.A. of early a.m. Dec 4th. 04/12 Daily Survey Progress Report facsimile to the Client with a request from R. Meaney to relocate Line 91CA-10. 05/12 Daily Survey Progress Report facsimile to the Client. Fax received with confirmation, along with revised coordinate positions for relocating Line 91CA-10. 06/12 Daily Survey Progress Report facsimile to the Client. 07/12 Daily Survey Progress Report facsimile to the Client. 08/12 Daily Survey Progress Report facsimile to the Client. 09/12 Daily Survey Progress Report facsimile to the Client. 10/12 Daily Survey Progress Report facsimile to the Client. 11/12 Daily Survey Progress Report facsimile to the Client. 12/12 Daily Survey Progress Report facsimile to the Client. 13/12 Daily Survey Progress Report facsimile to the Client and Final Progress Report for Carpentaria Survey 91CA. 4. PERSONNEL 4.1.1 SEISMIC CREW CREW LIST from 1st December to 13th December, 1991 Name Job Title/Function Allan Welfare Mike Chen Jim Sherrin Richard Hodson Ted Moojen Yngva Amundsens Diane Osborne Archie Edwards Roland Mervin Andy Temmen Rick Jonhs Glen Constant John Mason Ivan Donjerkovich Ian Macdonald Steve Bradley Roger Meaney Rick Romanik Party Manager Instrument Engineer System Operator System Operator Technician Technician Technician Quality Controller Quality Controller Compressor Engineer Airgun Mechanic Airgun Mechanic Airgun Mechanic Airgun Mechanic Concept System Technician Racal Survey Comalco Representative Austral Rep\Comalco Representative 4.1.2. MARINE CREW CREW LIST from 1st December to 13th December, 1991 Name Job title/function Dick Ridsdale Jim Bramwell Fred Kerr John Nash Dave Wu Steve Ryan Mike Clooney Mick Carley Brenton White Jim Kelly Pat Boothe Dave Capka Captain 1st Mate 2nd Mate Chief Engineer Second Engineer Motorman A.B.Seaman A. B.Seaman A.B.Seaman Chief Steward Chief Cook Second Cook Ian Taylor Larry Williams Chris King 4.1.3 ONSHORE SUPPORT Halliburton Geophysical Services Vessel Supervisor Vessel Administrator Vessel Administrator VESSEL SPECIFICATION NAME CALL SIGN BUILT TYPE YEAR OWNERS FLAG PORT OF REGISTRY Magnificent Creek VJLC Carrington Slipways N.S.W. Rig tender (adapted for Seismic) 1974 Finbar Marine Group Australian Fremantle, W.A. LENGTH BEAM DRAUGHT TONNAGE 62.32m (190 ft) 14.20m (43.3ft) 4.69m (14.3ft) Gross 1272.18 Net 738.9 MAIN ENGINES GENERATORS PROPELLERS BOW THRUSTER 4 x Daihatsu Diesel 2 x 250 Kw Kato/Cat 50Hz 2 x fixed pitch AUTOPILOT GYRO COMPASS RADARS Decca Arkas 42E 14/550 Plath Navigator II 1 x JRC JMA-3700 plotting 1 x Furuno FR 711 RADIOS Sailor Type R1117 Sailor Type 144B VHF Philips FM 320 CB Codan Type 6081-S Mk 2 Sea Eagle Mk II CB AWA TR 235A WEATHERFAX FATHOMETERS Koden FX 7181 Simrad EP 2BN Simrad EA OSS D600

CAPACITIES CONSUMPTION Fuel: 250 m3 Water:150 3m Fuel: 5-6 tons per day Water: 5 tons per day EVAPORATION OSMATRON: capacity 5 SPEED ENDURANCE ACCOMMODATION Max: 12.5 kts; cruising 9.5 kts 35-40 days 34 person VESSEL SAFETY EQUIPMENT Life boats Life rafts Rescue boat Emergency radios Life boat/raft radio Life jackets Life rings Fire pumps main Standby pump Fire extinguishers Inter Gas system Foam system Foam hoses Helideck Fire suits Fire blankets Breathing apparatus Resuscitators Line throwers Pyrotechnics Safety lines, harnesses Flotation work vest Eye protectors Ear protectors Safety Boots Medical supplies equipment None 4 x 25 man inflatable Alloy dinghy with outboard 2 fixed and 1 portable EPIRB Cabins 100% On deck 100% Standard: Y :With lights: Y Engine room Main deck Foam: Y: Powder: Y: Water: Y: Halon: Y: Engine room, Bow thruster room Streamer reel Streamer spare storage Main deck, bridge 2 2 2 Y Y Y Y Y Y Y Y PROCEDURES Station bills All cabins; in mess room Emergency equipment Fire drill, equipment inspection Abandon ship drill Man overboard drill Safety meetings Fire fighting instruction First Aid instruction Sea survival instruction Emergency radio inspection Pyrotechnics inspection Welding procedure enforcement No smoking areas enforcement All decks Monthly Monthly Monthly Monthly Annually Annually Annually Annually Annually Standard Not 100% (H.G.S.) (H.G.S.) (H.G.S.) procedure 6.1. INSTRUMENT SPECIFICATIONS TYPE NO. OF CHANNELS TAPE TRANSPORTS TAPE FORMAT RECORDING TAPES TAPE SPEED SAMPLE RATE RECORD LENGTH AMPLIFIER GAIN CONSTANT LOW CUT FILTERS HIGH CUT FILTERS NOTCH FILTER REPRODUCE MODE REPRODUCE SETTINGS POLARITY CONVENTION DYNAMIC RANGE FULL SCALE SIGNAL (Referred to EIN) EQUIVALENT INPUT NOISE TiTan 1000 300 data plus 12 auxiliary 2 x Aspen System 482 IBM SEG D Memorex 3800 bpi. 2m/sec 2ms 4 second IFP(in 12db steps) Programmable: Low= 4.15db 8 Hz at 18db/octave 128 Hz at 72db/octave OUT Defoat with PGC Variable SEG Normal Gain constant low 114db Gain constant high llOdb Preamp low = 0.35 uB RMS Preamp high =0.17 uB RMS CROSS FEED ISOLATION DISTORTION GAIN ACCURACY 80db between any 2 channels 0.1% 8-256 Hz +/- 2% chan, to channel, sem to sem OTHER: Multiplexed streamer operation: include TITAN 1000 recording system plus streamer PLOTTERS/LOGGERS Western "Fastbox II" Q.C. System CITOH Electronics CI 600 T.I Omni 800(ADL) EPC single trace profiler 6.2.2 RECORDING INSTRUMENTS DESCRIPTION DFOS STREAMER CONTROL SYSTEM The control function allows operation commands and configuration to be input via a video display terminal. It maintains the system sofware that controls the application of the configuration commands to the streamer interface, data I/O interface, reproduce data, streamer simulator and status processing function via control bus. Configuration and control of the signal processing function are provided via RS-232 serial link. The display terminal is also connected to the control function via RS-232 interface. The control function provides an interface to a Winchester hard disk unit to facilitate storage and control of system software. A floppy disk unit is provided to back the Winchester and to download new software releases. A line printer provides hard copy of configuration of disk files. TITAN 1000 GEOPHYSICAL CONSULTANTS PTY. LTD. DFOS 480 r\ SCS N DATA ) DATA > FCS 1/ N DIGITAL FIBRE OPTIC STREAMER^) 480 SEISMIC CHANNELS DATA ) STREAMER CONTROL SYSTEM DATA > HELD COMPUTER SYSTEM 1/ POWER CONTROL STATUS CONFIGURATION DATA ; RAWPS READ AFTER WRITE Q.C. PLOTTER SYSTEM .3

RECORDING INSTRUMENT DIAGRAM SCS OPERATOR FCS OPERATOR SYSTEM ENGINEERING PLOTTER CONTROL SCS OPERATOR RECORDING INSTRUMENT TEST A full set of monthly instrument tests is generally performed only at the start and finish of each voyage. This is because the Streamer Electronic Modules (SEMs) need to be removed from the cable for that operation. Summaries of the tests carried out are provided overleaf. Onboard analysis showed only minor problems and SEMs which failed to meet specification were replaced as the occasion arose. As is the usual practice, the test tapes will be processed by H.G.S. Sydney, and the results forwarded directly to the Company. Aboard M.V. Magnificent Creek the daily tests carried out were: Dynamic Range Determination (DRD). Impulse test. Cable (system) noise tests. Cable Q.C. tests. Monthly tests included : Equivalent Input Noise test (EIN). A/D Converter dynamic range test. Filter pulse tests. Crossfeed isolation tests. Amplifier harmonic distortion. Individual SEM checks. Skew check on all tape transports. All ones/alternate ones on tape transports. Pattern test: involves inputting various digital patterns into the system and checking data at the processing centre. 6.4.1 DAILY INSTRUMENT TEST DAILY INSTRUMENT TESTS - ANALYSIS RESULTS DATE: 4 December TEST AND RECORD NUMBERS GAIN FAILED COMMENTS | DRD FULL SCALE 1 FIXED OK | NO SIGNAL 2 FIXED OK | FILTER PULSE 8/18 - 128/72 3 IFP OK HARMONIC DISTORTION 20 DB DOWN 4 IFP OK EIN REFERENCE 5 IFP OK EIN 6 IFP OK | SIGNAL FREQUENCY IS 31 .25 H2 WHERE TEST SIG NAL IS USE D DAILY INSTRUMENT TESTS - ANALYSIS RESULTS DATE: 5 December | TEST AND RECORD NUMBERS GAIN FAILED COMMENTS | | DRD FULL SCALE 1 FIXED 0 OK NO SIGNAL 2 FIXED OK FILTER PULSE 8/18 - 128/72 3 IFP 0 OK | HARMONIC DISTORTION 20 DB DOWN 4 IFP OK | EIN REFERENCE 5 IFP OK EIN 6 IFP OK SIGNAL FREQUENCY IS 31 .25 HZ WHERE TEST SIGNAL IS USE1 D TEST AND RECORD NUMBERS GAIN FAILED COMMENTS DRD FULL SCALE 1 FIXED OK NO SIGNAL 2 FIXED OK FILTER PULSE 8/18 - 128/72 3 IFP OK HARMONIC DISTORTION 20 DB DOWN 4 IFP OK EIN REFERENCE 5 IFP OK EIN 6 IFP OK SIGNAL FREQUENCY IS 31 .25 HZ WHERE TEST SIGNAL IS USEl D DAILY INSTRUMENT TESTS - ANALYSIS RESULTS DATE: 6 December 6.4.2 DAILY INSTRUMENT TESTS DAILY INSTRUMENT TESTS - ANALYSIS RESULTS DATE: 7 December | TEST AND RECORD NUMBERS GAIN FAILED COMMENTS | DRD FULL SCALE 1 FIXED 0 OK | NO SIGNAL 2 FIXED OK FILTER PULSE 8/18 - 128/72 3 IFP OK HARMONIC DISTORTION 20 DB DOWN 4 IFP OK EIN REFERENCE 5 IFP OK I EIN 6 IFP OK | ^SIGNAL FREQUENCY IS 31 .25 RE WHERE TEST SIG NAL IS USS D DAILY INSTRUMENT TESTS - ANALYSIS RESULTS DATE: 8 December TEST AND RECORD NUMBERS GAIN FAILED COMMENTS DRD FULL SCALE i FIXED 0 OK NO SIGNAL 2 FIXED OK FILTER PULSE 8/18 - 128/72 3 IFP 0 OK HARMONIC DISTORTION 20 DB DOWN 4 IFP OK | EIN REFERENCE 5 IFP OK | EIN 1 - - 6 IFP OK | Signal frequency is 31 .25 HZ WHERE TEST TTGNALTS'USE D DAILY INSTRUMENT TESTS - ANALYSIS RESULTS DATE: 9 December TEST AND RECORD NUMBERS GAIN FAILED COMMENTS | DRD FULL SCALE 1 FIXED OK | NO SIGNAL 2 FIXED OK | FILTER PULSE 8/18 - 128/72 3 IFP OK | HARMONIC DISTORTION 20 DB DOWN 4 IFP OK | EIN REFERENCE 5 IFP OK | EIN 6 IFP OK | SIGNAL FREQUENCY IS 31 .25 HZ WHERE TEST SIGNAL IS USE! D CR24/81A 6.4.3 DAILY INSTRUMENT TESTS DATE:10 December TEST AND RECORD NUMBERS GAIN FAILED COMMENTS DRD FULL SCALE FIXED FIXED FILTER PULSE 8/18 - 128/72 3 HARMONIC

368067 EIN REFERENCE SIGNAL FREQUENCY IS 31.25 K2 WHERE TEST SIGNAL IS USED DAILY INSTRUMENT TESTS - ANALYSIS RESULTS TEST AND RECORD NUMBERS GAIN FAILED COMMENTS DRD FULL SCALE 1 FIXED 0 OK NO SIGNAL 2 FIXED OK FILTER PULSE 8/18 - 128/72 3 IFP 0 OK HARMONIC DISTORTION 20 DB DOWN 4 IFP OK EIN REFERENCE 5 IFP OK EIN 6 IFP OK SIGNAL FREQUENCY IS 31 .25 HZ WHERE TEST SIC NAL IS USE D DATE: 11 December DAILY INSTRUMENT TESTS - ANALYSIS RESULTS DAILY INSTRUMENT TESTS - ANALYSIS RESULTS DATE: 12 December TEST AND RECORD NUMBERS GAIN FAILED COMMENTS DRD FULL SCALE 1 FIXED OK NO SIGNAL 2 FIXED OK FILTER PULSE 8/18 - 128/72 3 IFP 1 mill sec delay HARMONIC DISTORTION 20 DB DOWN 4 IFP 1 mill sec delay EIN REFERENCE 5 IFP OK EIN 6 IFP OK SIGNAL FREQUENCY IS 31.25 HZ WHERE TEST SIGNAL IS USE D CRZ4781A TEST AND RECORD NUMBERS GAIN FAILED COMMENTS DRD FULL SCALE 1 FIXED OK NO SIGNAL 2 FIXED OK FILTER PULSE 8/18 - 128/72 3 IFP OK HARMONIC DISTORTION 20 DB DOWN 4 IFF OK EIN REFERENCE 5 IFP OK EIN 6 IFP OK SIGNAL FREQUENCY IS31725 HZ WHERE TEST SIC NAL IS USE D 6.4.4 DAILY INSTRUMENT TESTS - DAILY INSTRUMENT TESTS - ANALYSIS RESULTS DATE:13 December 7.1 STREAMER CABLE SPECIFICATIONS STREAMER TYPE MECHANICAL COUPLING STRAIN MEMBER TYPE SECTION TENSILE STRENGTH STREAMER DIAMETER STREAMER LENGTH ACTIVE SEISMIC GROUP LENGTH GROUP MIXING HYDROPHONES HYDROPHONE SPACING GROUP CAPACITANCE GROUP CHARGE SENSITIVITY (prior to preamp for 12.5m) Digital Multiplexed Stainless steel quick connect, field replaceable. Removable electrical connector with field replaceable pins and sockets. Kevlar Exceeds 25001bs straight steady pull 2.6 inch 3000 metres for 240 X 12.50 12.5m(6.25 x 2) standard mixed Up to five basic groups may be mixed with or without weighting to form a supergroup. Mixing may be overlapping. Each basic group may contribute to 5 supergroups. GSI Dish type, acceleration cancelling Linear: 1 phone every .3909 metres. 32 for 12.5m group length 16 for 6.25m groups 62 nf nominal for 12.5 groups 31 nf nominal for 6.25 groups 33.1 picocoulombs/pascal +/- ldb = 3310 nanocoulombs/bar GROUP SENSITIVITY GROUP VOLTAGE SENSITIVITY SIGNAL COUPLING STREAMER POWER SEISMIC CHANNELS PER SEM NUMBER OF SEMS Low preamp =33.1 uvolt/uBar +/-l®2db Hi preamp =132.4 uvolt/uBar +/-l''2db 53.4 uvolt/uBar +/- 1.2db (prior to preamp for 12.5 group, calculated using nominal gain constant) Control signals on twisted pair wire; power and depth control on separate wires. Data return via dual indepen dent optical fibres (240 channels each) hydrophone groups connected to each SEM via individual twisted pairs. Common twisted pairs for heading sensor system. AC voltage 160 to 290, 1.5 Khz synch ronised to SEM clock. Automatic safety shutdown and ground leakage detention 12 40+1 for auxiliaries (480 channel) 42 max for 504 seismic channel + 4 aux 7.1.2 STREAMER CABLE SPECIFICATIONS MAXIMUM NUMBER OF CHANNELS VIA OPTICAL FIBRE SEISMIC AUXILIARY INPUT DC OFFSET DEPTH (AT SEM) WATERBREAK SENSOR Q.C STATUS CONFIGURATION STATUS TEST OSCILLATOR OUTPUT 240 10 42 40 40 (.25 sample rate in lieu of seis) 42 42 42 (used for internal Q.C.) FIBRE OPTICAL Tx RATE BIT ERROR RATE TYPICAL PRACTICAL MEASUREMENT 7.182 Mbits Better than 1 in 10;? Better than 1 in 10' = 4 bit errors in 6 sec/fibre HEADING/DEPTH SENSORS Maximum 40 heading sensors and depth sensors externally mounted in combined unit. Redundant depth data available from transducers internal to

SEMs. Wiring provided for coil operated and sea water return type cable levellers. (SEM) PERFORMANCE STREAMER ELECTRONICS MODULE AMPLIFIER FREQUENCY RESPONSE (3db) A/D CONVERTER TYPE LINEARITY FULL SCALE ABSOLUTE ZERO GAIN A/D CONVERTER DYNAMIC RANGE PREAMPLIFIER TYPE GAIN CONSTANT IFP GAIN Low noise charge preamplifier followed by unity gain low-cut and anti-alias filter stages, followed by an Instant aneous Floating Point Amplifier (IFPA) 4 to 220 Hz 14 bit successive approximation + sign bit +/- 0.0015 % FSR (+/- 0.5 LSB) +/- 0.05 % FSR +/- 0.05 % FSR +/- 0.05 % FSR 78db min. Differential input FET capacitive charge amplifier Remote programmed by operator through onboard electronics. Can be set to low or high setting. The actual gain value is determined by the hydrophone capac itance. The nominal gain constant for 62 nf capacitance is: Low = 4.15 db: high = +7.88 db Min x 1 = 4 exp 0 = 0 db Max x 16,384 = 4 exp 7 = 84 db Resolution is 12 db steps 7.1.3 STREAMER CABLE SPECIFICATIONS MAXIMUM GAIN GAIN ACCURACY (CHANNEL TO CHANNEL, SEM TO SEM) GAIN ACCURACY EQUIVALENT INPUT NOISE(EIN) MAXIMUM TEST INPUT SIGNAL A/D FULL SCALE = 8191.5 mv DYNAMIC RANGE OF FULL SCALE SIGNAL REFERRED TO EIN DISTORTION CROSSFEED ISOLATION LOW CUT FILTERS OUT 8/18 8/12 18/12 HIGH CUT(ANTI-ALIAS) FILTER INPUT LINE FILTER FILTER PHASE DUPLICATION x 40,632 = 92.17db Preamp = high (nominal) +/- 2% Gain step(db) Accuracy(%) 0 to 36 +/- 0.05 36 to 48 +/- 0.065 48 to 60 +/- 0.15 60 to 72 +/- 0.50 72 to 84 +/- 1.00 8 to 128Hz, 62 nanofarad equivalent input capacitance as termination Preamp EIN(uB RMS) Low 0.35 High 0.17 Difference mode, 62 nanofarad equiva- lent input capacitance Preamp mv RSM mv Peak m/bars Peak Low 9340.95 13212.1 247.48 High 2335.24 3303.02 61.86 Gain constant Dynamic range Low + 114.0 High + 110.0 0.1% 8 to 256 Hz (T.H.D. measured to 6th harmonic) FS -0.8db to FS - 48db input level + 80db between any two channels, FS feeding 1 channel only. Typical +95db Standard cutoff frequencies (3db) 3db = 4Hz Slope 3db 6db/octave to 2 Hz = 12db/octave below 2 Hz 8 Hz Slope = 18 db/octave to 4 Hz = 24 db/octave below 4Hz 3db = 8 Hz Slope = 12 db/octave to 4 Hz = 18 db/octave below 4 Hz 3db = 18 hz Slope = 12 db/octave to 4 Hz = 18 db/octave below 4 Hz 6db corner 256 Hz fixed Slope 72 db/octave 6db corner 700 Hz fixed Slope 12 db/octave Type Pi-section +/- 0.5ms (manufacturing) +/- 1.0ms field test 1ms fixed SAMPLE RATE STREAMER CABLE SPECIFICATIONS DC OFFSET OFFSET CORRECTION Maximum of 1024mv at input to A/D Converter at max gain. (Approx 64 uv at input to IFP) Gain related and residual offset correction is applied in digital filters in onboard system. SES MULTIPLEXED CHANNEL Seismic I/P CH 1-12 ALLOCATION SEM internal use CH 13 DC offset correction CH 14 Test oscillator CH 15 REMOTE CONFIGURATION Depth Module address CH 16 Preamp Gain Low and High Gain mode fixed or float HYDROPHONE SPECIFICATION OPERATING TEMPERATURE OPERATING DEPTH DESTRUCTION DEPTH CAPACITANCE RESISTANCE VOLTAGE SENSITIVITY CHARGE SENSITIVITY DEPTH SENSITIVITY TEMPERATURE SENSITIVITY MOTION SENSITIVITY FREQUENCY RESPONSE LOWEST MECHANICAL RESONANCE 0 C TO 38 C 61m 275m 0.0062 Farads +/- 1.7% Greater than 1000 megohm 34.5db re 1 v/bar +/- 1.5 (-185.5 db re 1 v/Pa) db re 1 Pc/Pa +/- 2.0 less than ldb from 0 to 20 less than ldb from 0 C to 38 C less than 3 mv at 1 G and 45Hz 2Hz -1,500Hz: flat to less than ldb 2Hz 7.2 STREAMER CABLE DESCRIPTION This streamer is an upgraded version of

the 480 channel digital fibre optic system which entered service in early 1986. The system comprises three major sub-systems. The streamer contains up to 504 hydrophone groups with a basic group length of 12.5 metres, but up to five of these at a time may be combined to form a pre defined supergroup by use of external programming plugs. The seismic data from these is conditioned and converted to a digital form in electronic units in the streamer and returned to the ship via optical fibres. This is an active streamer which receives electrical power from the ship for the electronics modules. It also receives commands which configure the system in the water. On the ship, the seismic data is received by the Streamer Control System (SCS) which checks the integrity of the data, performs digital operations on them, and presents them in a serial form to the recording system on Ethernet 1inks. The operator sets up, controls the operation of the streamer, and also monitors its performance from a terminal on the SCS. The data received by the recording system from the SCS is demultiplexed into trace sequential format in a mass memory and has record and headers appended. The data is then recorded on Aspen tape drives. The recording system performs additional automatic quality checks on the data and provides several displays for operator evaluation. Configuration and control of the SEMs is provided by the streamer power system via the power bus. In the 240 channel configuration, SEMs 1 through 21 process digital data from previous SEMs and place them consecutively on fibre ’A'. At SEM 22, optical fibre 'A' is carrying its maximum number of seismic data channels so SEM 22 switches all of the data from SEMs 1 through 21 onto optical fibre 'B' . The data from SEMs 1-21 continues to be synchronised, re-timed and placed on fibre 'B' at each forward SEM, while the data being collected in the forward portion of the streamer, 22-42 is processed and put on optical fibre 'A'. 7.3 STREAMER CABLE AUXILIARY EQUIPMENT MODEL 396 CABLE DEPTH CONTROLLER (DIGIBIRD) The model 396 Cable Depth Controller is a microprocessor-based depth control device mounted externally on a marine seismic streamer cable. The assembly is streamlined to minimise flow-induced noise generation, and is designed for compatibility with existingmounting hardware and communication coils. The unit is battery powered, non corroding and supports a number of functions for improved cable depth control. Communications with up to 63 Digibirds occur over a single twisted pair transmission line, using traditional inductive coupling techniques in a 27 kilo hertz FSK communication link. The transmit/receive (Tx/Rx) coil in the streamer may be either a Digicourse Model 385 coil, mounted in a Model 301 Streamer Interface Adaptor, or a similar Tx/Rx coil of other manufacture. The Digibird supports a variety of command and data acquisition functions including: - setting cable depth reporting current depth and temperature reporting battery usage in hours and minutes, % of battery life remaining and amp-hours consumed - reporting wings angle with resolution of 1 degree providing ballast information. The Digibird has a stainless steel body, moulded plastic nose and shank parts, and all stainless steel hardware. The wings are moulded of urethane mixed with phenolic micro balloons (for buoyancy), and sized to provide 20 kg of force at 5 knots. The entire bird unit attaches to the cable using standard bird-mounting collars on 26.5 inch centres. Using a sea water port at the tail, the bird monitors depth over a range of 0-200 feet with a resolution of 0.1 feet. Once programmed with an operating depth, the bird operates autonomously to supply sufficient force to control cable depth. In addition the control

algorithm parameters may be altered under software control to respond to changing environmental or operational conditions. Such algorithm changes may be made while the bird is either in or out of the water. Emergency surface or emergency dive facilities are provided in the Digiscan Model 293 operator station. The Model 396 Compass Bird incorporates a Model 321 heading Sensors in the body of the unit which allows depth temperature and heading data plus depth keeping ability, to be derived from just one externally mounted device. SPECIFICATION MODEL 396 COMPASS BIRD Mechanical: Weight : 2.8 kg in sea water Length : lm Mounting : conventional bird collars on .57m centres Batteries: 4 x alkaline D cell or 2 lithium DD cells Endurance: 3-4 weeks typical use(alkaline) 6-8 weeks typical use(lithium) Conununi cat i ons: Type: serial FSK Frequency: 27 khz Data rate: 1200 bits/second Diving plane: Lift : 45 lbs(20kg) at 5 knots at 15 deg wing angle Airfoil: NASA 651-012 airfoil section Aspect ratio: 2.0 Wing span: 48 cm Surface area: 903 sq. cm Depth Sensor: Operating range: 61m Accuracy: +/- 0.15m Resolution: +/- 0.03m Compass (Digicourse Model 321/02): Resolution: +/-0.3 degrees Accuracy: 0.5 degrees Sampling: Selectable: 0.3-6 second Averaging: Selectable: 3, 7, 15, 31 sample M/V MAGNIFICENT CREEK H.G.S. 240 TRACE STREAMER SIEHH TO CEWrFE tX MRQUH ARRAY an Mficx ssc-nobcsfi Of FHHTTO CENTRE OF HEARGROUP ie <z> TAL-BUOT <=>==fr 14 20 •O 18 <z> STRETCH SECTDN 18 CZWt (SEM)StreamerElectronicModule NOTES Total length of a LI and L2 cluster is 130m. Group length is 12.5m. The central navigation point is the reference position for all antennae. Depth control units and relevant dimensions are listed in the section of the report. CKZ^/dlA 7.5 STREAMER CABLE TESTS Testing of the SEMs is referred to in section 6.4 Other tests conducted daily on the streamer included offset distance checks and ambient noise records, both of which were carried out at the beginning and end of each line. A cable Q.C. test was also performed daily by request. This test measures cable response and is useful for checking on groups which may be weak. As well as the monitor records obtained from the WESTERN Plotter, it is also possible to obtain a hard copy print out of the cable noise of each group, sampled simultaneously at 2ms. However, the computer time needed for this operation makes it impractical on approach to the line when other test procedures, such as checking the airguns' timing, are also necessary. Therefore, as a matter of practice, the cable-noise print out is produced after the end of the line. ENERGY SOURCE SPECIFICATION ENERGY SOURCE MANUFACTURER NUMBER OF GUNS WAVE SHAPE KIT TOTAL ARRAY VOLUME TYPICAL PEAK OUTPUT PULSE TO BUBBLE RATIO TYPICAL VALUES OBSERVED OPERATING AIR PRESSURE GUN TIMING METHOD OPERATING GUN DEPTH ARRAY GEOMETRY MONITORING MINIMUM ARRAY VOLUME MINIMUM AIR PRESSURE FAR FIELD SIGNATURE NUMBER OF COMPRESSORS TYPE AND CAPACITY MINIMUM RECYCLE TIME DELAY TIME TO PEAK POWER ARRAY GEOMETRY OFFSET TO CENTRE OF SOURCE ARRAY OFFSET CENTRE ARRAY TO CENTRE NEAR CABLE GROUP (No 240) VSX Sleeve airguns Texas Instruments 32 No 1090a in. 102 bar/metres quoted 13 : 1 quoted No test carried out 1800 psi TIGER System 5m Hydrostatic air flow lines and gauges; measured strops to Norwegian buoys Arrival time of output selected guns to geophones on gun strings and near group Not less than 1800 cu.in Not less than 1600 psi Not recorded 8 3 Sullair 300 SCFM driven by Caterpillar 3406 engines.(2 x on line) 5 PB-44 600 SCFM, driven by GM-671 (3 x on line) 9

second 51.2ms 8.33 gun string separation (2 x strings) 97m 176m nominal ENERGY SOURCE DIAGRAM M.V. MAGNIFIENT CREEK 1090 CUBIC-INCH SLEEVE GUN ARRAY CLIENT: COMALCO ALUMINIUM LIMITED DATE: DECEMBER 1991 SURVEY: CA91 STARJ3DARD DUTER STRING ( 16 GUNS 13.95m & 520 cu in. 2 ISO 80 BO 60 >4D 40 40 40 x >40* 40* •'40 4fr >40 216 40 40 2D 80 10 10 THESE TVO SUB-ARRAYS ARE USED TOGETHER TO FORM 4 1D90 cu.in VDLUi array - . 200 120 BO 80 3] Mfl 40 40 40 4lA 40 40 4d- 447 4MH 40 fetllo'- 3) I ainn | |l.80n | |i50it| ]1.50m| 1.20 | | 1.2& | 160 80 BO €0 >40 ■40 40 4fl V >40 4 fr >40 20- 40 40 2D 20 THESE TVO SUB-ARRAYS ARE USED TOGETHER TO FORM A 1090 cu.in VQLUMI ARRAY. < 17 13 19 20 21 S2 23 24 2 5 26 27 28 29 30 31 32 STARBOARD INNER STRING ( 16 GUNS 13.35r. @ 570 cu in. ) 2M 120 Bp 80 3Q Mo 40 40 40 44 s - 4d 40 40- 4a '4<7 40 40^ 40 ^0 jtf*- al I airin I |l.80n I [iSO^ |l.50n| 1.20 | | 1.2Q [ 33 3+ 35 36 37 38 39 40 41 42 43 44 45 46 <7 48 PDRT DUTER STRING C 16 GUNS 13.95n 6 520 cu in. ) ENERGY SOURCE TESTS No tests were conducted on the output of the array or any of its components. As a matter of practice, no near or far field recording is carried out. Near cable group offset distance is checked at the start and finish of each line, using return times from hydrophones in fixed positions on each gun string. Airgun array spread calculations were made at least once a day by request and the method of determination is included in the HGS Field Report. ENERGY ARRAY AND OFFSET DIAGRAM M.V. MAGNIFIENT CREEK 1090 CUBIC-INCH SLEEVE GUN ARRAY CLIENT: COMALCO ALUMINIUM LIMITED DATE: DECEMBER 1991 SURVEY: CA91 EITHER OF THESE TWO SUB-ARRAYS ARE USED TO FORM AN ARRAY OF 10903.IN. VOLUME. Port outer and Starboard inner is one configuration with Port inner and Starboard outer the other configufation. Only one configuration utilized when operating. CRZ4/d1A NAVIGATION SYSTEMS DETAILS SKYFIX Racal Survey has recently introduced its SkyFix Differential GPS System in the Far East using the Inmarsat Pacific Ocean Region and Indian Ocean Region. Extensive performance trials and projects undertaken to date have shown that SkyFix meets the best industry expectations in terms of quality of service and accuracy. The system embodies the successful combination of data capacity, range and coverage, with a flexible networked approach that lends itself to comprehensive performance and quality monitoring. The link capacity of 1200 bits per second allows data from a number of networked reference stations to be sent simultaneously without introducing unacceptable delays between reference station and user. With four reference stations, each generating correction data for ranges from eight satellites, an upgrade rate of better than three seconds is achieved by the SkyFix system. The wide area coverage of the Inmarsat Pacific Ocean Region satellite can be seen in Fig 3. Clearly, the reference station/user separation is no longer constrained by the effective range of a terrestrial data link. This allows full advantage to be taken of the great distance over which the corrections remain valid. Satellite communications systems, particularly at the Inmarsat L-band frequency of 1.5 GHz, are extremely reliable and free of the interference associated with the crowded M.F./H.F bands. This high data integrity gives users confidence that the correction will be continuously received without interference. The SkyFix Australia and New Zealand network comprises reference station at Cairns, Darwin, Broome, Perth, Adelaide and Sydney. The differential correction generated at each reference station is brought via landlink to each data hub, and

to a control centre in Singapore where the system is monitored for performance and quality. A composite message containing full RTCM 104 formatted data from all reference stations is then sent via dual redundant landlinks to the OTC earth station at Perth for updating and broadcasting over the Inmarsat Pacific Region satellite. The design of reference station networks provides a high quality service to major offshore hydrocarbons prospect areas. Ideally, each of these will be covered by more than one reference station. The system is easily expandable to provide new areas of coverage by the addition of further networked reference stations. Correction data is automatically included in the system performance and quality control function at the control centres. SKYFIX Whilst the DGPS service providers have no control over the operation of the GPS system itself, performance can be monitored, quantified and reported to users. The function of the SkyFix data hub and control centre in Australia is of fundamental importance as its role is to guarantee the best possible system performance. The SkyFix control centre has control over and responsibility for the differential data generated at the reference station and the subsequent broadcast to users. For this reason, monitoring and control functions include extensive analysis and archiving of the corrections and the comparison of data arriving from different reference stations within the network. In addition, satellite data link receiving equipment verifies correct broadcast data reception, and this off-air data is applied to locally observed raw observations to verify user-positioning performance. The SkyFix monitoring and control process continues 24 hours a day. On board the user vessel or drilling rig etc. , the data is received either via an existing Inmarsat-A terminal or by a terminal provided by Racal Survey. Whichever terminal is used, the signal is taken at Inmarsat A.I.F. band into a purpose designed unit which tunes to the pre-assigned SkyFix broadcast frequency and demodulates and decodes the correction data. This is then fed directly to the on-board GPS equipment. The SkyFix combination of the Inmarsat satellite communication links using the RTCM 104 DGPS data protocol, the reference station, monitoring and user infrastructure has been shown, through a growing body of project and trial experience, to provide a robust Differential GPS operating environment which is consistently capable of pinpointing positions to an accuracy of 5 metres or better. 9.2 SPHEROID SPHEROID: ANS SEMI-MAJOR AXIS: RECIPROCAL OF FLATTENING: 6378160 298.25 WGS 84 to AGD 66 Figures used to transfer WGS 84 co-ordinates to AGD 66. DELTA X: DELTA Y: DELTA Z: 133 48 148 Position on Darwin Wharf for initial calibration check: Latitude: Longitude: 12 28 21.501 S 130 50 45 14 E Position of Cairns Differential Station: Latitude: Longitude: 16 54 21.945 S 145 45 35.409 E All satellite positions (GPS and Transit) now broadcast in WGS 84. no transformation from WGS 72 is required. 9.3 BATHYMETRY 9.3.1 FATHOMETER DESCRIPTION The SIMRAD EA Hydrographic Echosounder used during the survey is a precision water-depth measurement device. It can be used at depths ranging from extremely shallow to 1000-1200 metres and has an 8" dry paper recorder which can be set to a multiplicity of scales, speeds and resolutions. The sounder is also equipped with a digital depth display and an output connector for BCD depth data signals. The resolution of this output data and the display is 0.1 metre to 200 metres and 1 metre at depths greater than 200 metres. Sound velocity and draft compensation can be manually set for virtually all normal operating conditions. Figure 9.4.1.1 shows a table for the ranges and sounding

rates of the unit. BASIC RANGE SELECTOR PHASED A B C D 5m & 10m RANGE 1 0-50 0-100 0-250 0-500 Phased in 1 m. steps to a maximum range of 175-180 RANGE 2 30-80 60-160 150-400 300-800 RANGE 3 60-110 120-220 300-550 600-1100 RANGE 4 90-140 180-280 450-700 900-1400 RANGE 5 120-170 240-340 600-850 1200-1700 PULSES 258/min 129/min 51.6/min 25.8/min 258/min Figure 9.4.1.1 SIMRAD EA - RANGES AND SOUNDING RATES The echo sounder has two frequencies of operation - 38 kHz and 710 kHz. Sounding can be performed with one or both frequencies selected, and in the latter, the system transmits alternately on 38 kHz and 710 kHz. When operating with the single 710 kHz, the sounding rate is actually 774 soundings per minute, of which all are digitised but only every third is displayed on the recording paper. Sound velocity compensation covers a range from 1400 m/sec to 1547 m/sec and draught corrections from 0 to 9.9 metres are possible in 0.1 metre steps. During the survey, the unit was also fitted with an AB100 range print out unit which annotated the analogue chart with the range in use automatically. 9.4 ANTENNAE LOCATION DIAGRAM LOCATION 7. - CNP X(+STBD) 0.0m Y(+FWD) 0.0m - PRIMARY DGPS ANTENNA 0.0m 0.0m TRANSIT SATELLITE ANTENNA 1.0m 2.5m FATHOMETER TRANSDUCER 3.2m 2.4m SONAR TRANSDUCER -3.0m 2.5m BACKUP DGPS ANTENNA 0.0m - 0.9m CENTRE OF STERN ,0.0m -29.8m CENTRE OF SOURCE ARRAY 0.0m -96.8m NEAR BCU 0.0m -232.0m OFFSET FROM CNP 2. 3. 4. 5. 6. 8.SKYFIX INMARSAT NB: THE COMMON NAV POINT (CNP) IS THE REFERENCE POINT FOR SHOT CONTROL. CR24781A 10.1.0 DAILY SURVEY ACTIVITY DETAILS FROM TO ACTIVITY TOTAL CHARGE ** DATE 04/12/91 00:00-04:35 DEPLOYING STREAMER 0.000 0.000 04:35-05:30 DEPLOYING AIRGUN SOURCE 0.000 0.000 05:30-05:57 TRANSIT TO LINE 91CU-02 0.000 0.000 05:57-08:41 RECORDING LINE 91CU-02 2.733 0.000 08:41-12:14 LINE CHANGE 3.550 0.000 12:14-15:06 RECORDING LINE 91CU-01 2.867 0.000 15:06-19:04 HGS LINE CHANGE TO NEW PROSPECT 3.967 0.000 19:04-22:55 COMALCO CHARGE LINE CHANGE TO CA 3.850 3.850 22:55-24:00 RECORDING LINE 91CA-17 1.083 0.000 ** Subtotal ** 18.050 3.850 ** DATE 05/12/91 00:00-07:21 RECORDING LINE 91CA-17 7.350 0.000 07:21-09:01 LINE CHANGE 1.667 0.000 09:01-14:52 RECORDING LINE 91CA-06 5.850 0.000 14:52-17:03 LINE CHANGE 2.183 0.000 17:03-22:54 RECORDING LINE 91CA-08 5.850 0.000 22:54-24:00 LINE CHANGE 1.100 0.000 ** Subtotal ** 24.000 0.000 ** DATE 06/12/91 00:00-00:23 LINE CHANGE 0.383 0.000 00:23-00:58 EXTENDED LINE CHANGE WAITING ON NAV 0.583 0.583 00:58-01:29 RECORDING 91CA-09 TERMINATED 0.517 0.000 01:29-03:43 CMS FAILURE- NAV DATA NOT RECORDED 2.233 0.000 03:43-09:33 RECORDING LINE 91CA-09 5.833 0.000 09:33-11:49 LINE CHANGE 2.267 0.000 11:49-21:37 RECORDING LINE 91CA-07 9.800 0.000 21:37-23:32 LINE CHANGE 1.917 0.000 23:32-24:00 STREAMER REPAIR EXTENDED LINE CHG 0.467 0.000 ** Subtotal ** 24.000 0.583 ** DATE 07/12/91 00:00-01:18 EXT- LINE CHANGE STREAMER REPAIR 1.300 0.000 01:18-08:43 RECORDING LINE 91CA-10 7.417 0.000 08:43-11:06 LINE CHANGE 2.383 0.000 11:06-17:44 RECORDING LINE 91CA-11 6.633 0.000 17:44-19:54 LINE CHANGE 2.167 0.000 19:54-24:00 RECORDING LINE 91CA-04 MSP 1800 4.100 0.000 ** Subtotal ** 24.000 0.000 10.1.1 DAILY SURVEY ACTIVITY DETAILS FROM TO ACTIVITY TOTAL CHARGE ** DATE 08/12/91 00:00-07:15 RECORDING LINE 91CA-04 7.250 0.000 07:15-09:25 LINE CHANGE 2.167 0.000 09:25-18:06 RECORDING LINE 91CA-05 8.683 0.000 18:06-21:22 LINE CHANGE 3.267

0.000 21:22-23:25 RECORDING LINE 91CA-03 TERMINATED 2.050 0.000 23:25-24:00 INSTRUMENT FAILURE - FCS HANGUP 0.583 0.000 ** Subtotal ** 24.000 0.000 ** DATE 09/12/91 00:00-01:23 INSTRUMENT FAILURE-FCS HANGUP 1.383 0.000 01:23-01:35 RECORDING OVERLAP LINE 91CA-03A 0.200 0.000 01:35-08:17 RECORDING LINE 91CA-03A 6.700 0.000 08:17-10:22 LINE CHANGE 2.083 0.000 10:22-18:53 RECORDING LINE 91CA-02 8.517 0.000 18:53-21:17 LINE CHANGE 2.400 0.000 21:17-24:00 RECORDING LINE 91CA-01 2.717 0.000 ** Subtotal ** 24.000 0.000 ** DATE 10/12/91 00:00-06:03 RECORDING LINE 91CA-01 6.050 0.000 06:03-08:55 LINE CHANGE 2.867 0.000 08:55-23:18 RECORDING LINE 91CA-12 14.383 0.000 23:18-24:00 LINE CHANGE 0.700 0.000 ** Subtotal ** 24.000 0.000 ** DATE 11/12/91 00:00-01:55 LINE CHANGE 1.917 0.000 01:55-08:31 RECORDING LINE 91CA-14 6.600 0.000 08:31-10:35 LINE CHANGE 2.067 0.000 10:35-18:16 RECORDING LINE 91CA-13 7.683 0.000 18:16-20:58 LINE CHANGE 2.700 0.000 20:58-24:00 RECORDING LINE 91CA-15 MSP 1410 3.033 0.000 ** Subtotal ** 24.000 0.000 ** DATE 12/12/91 00:00-11:29 RECORDING LINE 91CA-15 11.483 0.000 11:29-15:09 LINE CHANGE 3.667 0.000 15:09-24:00 RECORDING LINE 91CA-16 8.850 0.000 ** Subtotal ** 24.000 0.000 ** DATE 13/12/91 00:00-01:51 RECORDING LINE 91CA-16 1.850 0.000 01:51-12:36 LINE CHANGE PICK UP REMAINDER L/ll 10.750 0.000 12:36-13:50 RECORDING LINE 91CA-11A W-END 1.233 0.000 ** Subtotal * * 13.833 0.000 *** Total *** 223.88 4.433 10.2 DAILY SURVEY PRODUCTION DETAILS LINE DIR FSP LSP TOT-SP TOT-KM FCSP LCSP TOT-CSP TOT-CKM STATUS ** DATE: 04/12/91 * START TIME 05:57 91CU-02 089 101 1275 * Subsubtotal * 1175 29.375 101 1275 1175 1175 29.3750 29.3750 COMP START TIME 12:14 91CU-01 179 101 1356 Subsubtotal * 1256 31.400 101 1356 1256 1256 31.4000 31.4000 COMP START TIME 22:55 91CA-17 180 101 540 Subsubtotal * 440 11.000 101 540 440 440 11.0000 11.0000 MSP ** Subtotal ** ** DATE: 05/12/91 2871 71.7750 START TIME 00:00 91CA-17 180 541 3427 Subsubtotal * 2887 72.175 541 3427 2887 2887 72.1750 72.1750 COMP START TIME 09:01 91CA-06 270 101 2547 Subsubtotal * 2447 61.175 101 2547 2447 2447 61.1750 61.1750 COMP START TIME 17:03 91CA-08 90 101 2540 Subsubtotal * 2440 61.000 101 2540 2440 2440 61.0000 61.0000 COMP ** Subtotal ** 7774 194.3500 ** DATE: 06/12/91 START TIME 03:43 91CA-09A 270 101 2543 Subsubtotal * 2443 61.075 101 2543 2443 2443 61.0750 COMP 61.0750 * START TIME 11:49 91CA-07 090 101 4323 * Subsubtotal * 4223 105.575 101 4323 4223 4223 105.5750 105.5750 COMP ** Subtotal ** 6666 166.6500 10.2.1 DAILY SURVEY PRODUCTION DETAILS LINE DIR FSP LSP TOT-SP TOT-KM FCSP LCSP TOT-CSP TOT-CKM STATUS DATE: 07/12/91 DATE: 09/12/91 91CA-03A 270 944 3763 * Subsubtotal * 2820 70.500 944 3763 * START TIME 10:22 91CA-02 090 101 3759 * Subsubtotal * 3659 91.475 101 3759 * START TIME 21 :17 91CA-01 270 101 1230 1130 28.250 101 1230 ** * START TIME 01:35 * Subsubtotal * ** Subtotal ** 2820 70.5000 COMP 2820 70.5000 3659 91.4750 COMP 3659 91.4750 1130 28.2500 MSP 1130 28.2500 7609 190.2250 91CA-10 073 101 3285 3185 79.625 101 3285 3185 79.6250 COMP * Subsubtotal * 3185 79.6250 * START TIME 11:06 91CA-11 257 101 2847 * Subsubtotal * 2747 68.675 101 2847 2747 68.6750 COMP 2747 68.6750 * START TIME 19:54 91CA-04 270 101 1800 1700 42.500 101 1800 1700 42.5000 MSP ** * START TIME 01:18 Subsubtotal * 1700 42.5000 ** Subtotal ** 7632 190.8000 ** DATE: 08/12/91 START TIME 00:00 91CA-04 270 1801 4786 2986 74.650 1801 4786 2986

74.6500 COMP * Subsubtotal * 2986 74.6500 * START TIME 09:2 91CA-O5 089 101 3755 * Subsubtotal * 3655 91.375 101 3755 3655 91.3750 COMP 3655 91.3750 * START TIME 21:22 91CA-03 270 101 943 843 21.075 101 943 843 21.0750 TBC * Subsubtotal * 843 21.0750 ** Subtotal ** 7484 187.1000 10.2.2 DAILY SURVEY PRODUCTION DETAILS LINE DIR FSP LSP TOT-SP TOT-KM FCSP LCSP TOT-CSP TOT-CKM STATUS ** DATE: 10/12/91 * START TIME 00:00 91CA-01 270 1231 3764 2534 63.350 1231 3764 2534 63.3500 COMP * Subsubtotal * 2534 63.3500 * START TIME 08:55 91CA-12 180 101 6116 6016 150.400 101 6116 6016 150.4000 COMP * Subsubtotal * 6016 150.4000 ** Subtotal ** 8550 213.7500 it it DATE: 11/12/91 * START TIME 01:55 91CA-14 000 101 3041 2941 73.525 101 3041 2941 73.5250 COMP * Subsubtotal * 2941 73.5250 * START TIME 10:35 91CA-13 359 101 3220 3120 78.000 101 3220 3120 78.0000 COMP * Subsubtotal * 3120 78.0000 * START TIME 20:58 91CA-15 180 101 1410 1310 32.750 101 1410 1310 32.7500 MSP * Subsubtotal * 1310 32.7500 ** Subtotal ** 7371 184.2750 ** DATE: 12/12/91 * START TIME 00:00 91CA-15 180 1411 6133 4723 118.075 1411 6133 4723 118.0750 COMP * Subsubtotal * 4723 118.0750 * START TIME 15:09 91CA-16 000 101 3850 3750 93.750 101 3850 3750 93.7500 MSP * Subsubtotal * 3750 93.7500 ** Subtotal ** 8473 211.8250 ** DATE: 13/12/91 * START TIME 00:00 91CA-16 000 3851 4732 882 22.050 3851 4732 882 22.0500 COMP * Subsubtotal * 882 22.0500 * START TIME 12:36 91CA-11A 077 111 619 509 12.725 111 619 509 12.7250 COMP * Subsubtotal * 509 12.7250 ** Subtotal ** 1391 34.7750 *** Total *** 65821 1645.5250 10.3 FIELD TAPE LOG LINE NUMBERS FILE NOS. TAPE NOS. TOTAL DATE 91CU-02 91CU- 91CU-01 91CU- 101 1275 101 1356 6430 - 6441 CU 6442 - 6453 CU 12 04/12/91 12 04/12/91 91CA-17 91CA- 541 3427 91CA-06 91CA- 101 2547 91CA-08 91CA- 101 2540 91CA-09A 91CA- 101 2543 91CA-07 91CA- 101 4323 91CA-10 91CA- 101 3285 91CA-11 91CA- 101 2839 91CA-04 91CA- 101 4782 91CA-O5 91CA- 101 3755 91CA-03 91CA- 101 951 91CA-03A 91CA- 1839 3763 91CA-02 91CA- 101 3759 91CA-01 91CA- 1231 3764 91CA-12 91CA- 101 6113 91CA-14 91CA- 101 3038 91CA-13 91CA- 101 3220 91CA-15 91CA- 1411 6125 91CA-16 91CA- 101 4713 91CA-11A 91CA- 111 619 *** Total *** 6454 - 6485 CA 32 05/12/91 6486 - 6508 CA 23 05/12/91 6509 - 6531 CA 23 05/12/91 6534 - 6556 CA 23 06/12/91 6557 - 6596 CA 40 06/12/91 6597 - 6626 CA 30 07/12/91 6627 - 6652 CA 26 07/12/91 6653 - 6696 CA 44 08/12/91 6697 - 6731 CA 35 08/12/91 6732 - 6739 CA 8 08/12/91 6740 - 6766 CA 27 08/12/91 6767 - 6801 CA 34 09/12/91 6802 - 6766 CA 35 10/12/91 6837 - 6893 CA 57 10/12/91 6894 - 6922 CA 29 11/12/91 6923 - 6953 CA 31 11/12/91 6954 - 7010 CA 57 12/12/91 7011 - 7054 CA 44 13/12/91 7055 - 7059 CA 5 13/12/91 627 LINE STATUS COMALCO CARPENTARIA MARINE SURVEY LINE STATUS 91CU & 91CA LINE DIR FSP LSP KMS FCSP LCSP CHGKMS STATUS Lines 91CU Q23/P 01 179 101 1356 31.4000 101 1356 31.4000 COMP 01 270 101 1230 28.2500 101 1230 28.2500 MSP 01 270 1231 3764 63.3500 1231 3764 63.3500 COMP 02 089 101 1275 29.3750 101 1275 29.3750 COMP 02 090 101 3759 91.4750 101 3759 91.4750 COMP Lines 91CA Q22/P 03 270 101 943 21.0750 101 943 21.0750 TBC 03A 270 944 3763 70.5000 944 3763 70.5000 COMP 04 270 101 1800 42.5000 101 1800 42.5000 MSP 04 270 1801 4786 74.6500 1801 4786 74.6500 COMP 05 089 101 3755 91.3750 101 3755 91.3750 COMP 06 270 101 2547 61.1750 101 2547 61.1750 COMP 07 090 101 4323 105.575 101 4323 105.575 COMP 08 90 101 2540 61.0000

101 2540 61.0000 COMP 09A 270 101 2543 61.0750 101 2543 61.0750 COMP 10 073 101 3285 79.6250 101 3285 79.6250 COMP 11 257 101 2847 68.6750 101 2847 68.6750 COMP 11A 000 111 619 12.7250 111 619 12.7250 COMP 12 180 101 6116 150.400 101 6116 150.400 COMP 13 359 101 3220 78.0000 101 3220 78.0000 COMP 14 000 101 3041 73.5250 101 3041 73.5250 COMP 15 180 101 1410 32.7500 101 1410 32.7500 MSP 15 180 1411 6133 118.075 1411 6133 118.075 COMP 16 000 101 3850 93.7500 101 3850 93.7500 SP 16 000 3851 4732 22.0500 3851 4732 22.0500 COMP 17 180 101 540 11.0000 101 540 11.0000 MSP 17 180 541 3427 72.1750 541 3427 72.1750 COMP LINE: 91CU-02 AZIMUTH: 089 STATUS: COMP DATE: 04/12/91 START: 05:57 HRS END: 08:41 HRS FSP: 101 LSP: 1275 FCSP: 101 TOTAL SP: 1175 LCSP: 1275 TOTAL CSP: 1175 TOTAL KM: TOTAL CKM: 29.375 29.375 FSP LAT: 11 42 41.9 S LSP LAT: 11 41 33.7 S FSP LSP LON: 140 LON: 140 FSP WATER DEPTH: 63.0 LSP WATER DEPTH: 65.0 OFFSET (M): 77.6 WIND: 5-1-kts W SEA: 2 SWELL (M): 0 STREAMER:- DEPTHS (M):6+/-l SOL NOISE: 2.3 uBAR AVERAGE EOL NOISE: 2.03 uBAR AVERAGE STATUS: Trace #188 DEAD FEATHERING : 4.3 PORT - 2.1 STBD NEAR 6 GROUPS: 2.027 NEAR 6 GROUPS: 2.24 uBAR AVERAGE uBAR AVERAGE DEPTH (M): 6 PRESSURE (psi): 1800 ENERGY SOURCE:- CAPACITY (in3): 1090 PERFORMANCE: Gun #16 Off NAVIGATION:- SYSTEM: SkyFix STATIONS IN USE: SV 6,11, 19,18 PERFORMANCE: Good SP 201-289 SV 15 low elevation causing drift in readings to port of true position. Sp 291 about 80m off line. COMMENTS: EDITS: Trace 188 Record 723 bad. LINE: 91CU-01 AZIMUTH: 179 STATUS: COMP DATE: 04/12/91 START: 12:14 HRS END: 15:06 HRS FSP: 101 LSP: 1356 FCSP: 101 LCSP: 1356 TOTAL SP: 1256 TOTAL CSP: 1256 TOTAL KM: TOTAL CKM: 31.400 31.400 FSP LAT: 11 33 58.85 S LSP LAT: 11 50 59.94 S FSP LON: 140 21 LSP LON: 140 21 29.30 E 49.19 E FSP WATER DEPTH: 64.0 LSP WATER DEPTH: 65.0 OFFSET (M): 78.0 WIND: 5 kts SEA: 2 SWELL (M): 0.5 STREAMER:- DEPTHS (M):6+/-l SOL NOISE: 2.0 uBAR AVERAGE EOL NOISE: 1.86 uBAR AVERAGE STATUS: Trace #188 DEAD FEATHERING : 5.8 PORT NEAR 6 GROUPS: 1.96 NEAR 6 GROUPS: 1.95 uBAR AVERAGE uBAR AVERAGE ENERGY SOURCE:- CAPACITY (in3): 1090 DEPTH (M): 6 PRESSURE (psi): 1800 PERFORMANCE: BOTH LARGE AND SMALL ARRAYS WERE USED DOWN THE LINE TO SEE IF DATA COULD BE IMPROVED. ON THE PAPER MONITORS THE 1080 CU. IN. APPEARED BETTER NAVIGATION:- SYSTEM: SkyFix STATIONS IN USE: SV 12, 13, 24, 16 PERFORMANCE: DURING SATELLITE CHANGES THE VESSEL DRIFT TILL THE NEW SV IS INTO PLACE. DISTANCE OF DRIFT DEPENDS ON THE CURRENT AND THE HEADING. COMMENTS: EDITS: TR#188. DATA IS VERY SHALLOW AND THERE IS SOME DEEPER EVENTS. START: 22:55 END: 07:21 HRS HRS FSP: LSP: 101 3427 FCSP: 101 LCSP: 3427 TOTAL SP: TOTAL CSP: 3327 3327 TOTAL KM: TOTAL CKM: 83.175 83.175 FSP LAT: 12 34 33. 46 S FSP LON: 140 39 38.97 E FSP WATER DEPTH: 64.0 LSP LAT: 13 19 28. 95 S LSP LON: 140 39 36.63 E LSP WATER DEPTH: 57.0 LINE: 91CA-17 AZIMUTH: 180 STATUS: COMP DATE: 05/12/91 OFFSET (M): 78.0 WIND: 10 KTS NW SEA: 2 SWELL (M): 1 STREAMER:- DEPTHS (M):6+/-l SOL NOISE: 2.8 uBAR AVERAGE EOL NOISE: 2.7 uBAR AVERAGE STATUS: TRACE #188 DEAD FEATHERING : 3.2-0.6 PORT - STBD NEAR 6 GROUPS: 2.2 NEAR 6 GROUPS: 2.6 uBAR AVERAGE uBAR AVERAGE ENERGY SOURCE:- CAPACITY (in3): 1090 DEPTH (M): 6 PERFORMANCE: SP 1680 GUN #21 VOL 1050 CU IN. TESTED FULL ARRAY SP 1931 TO 1946 PRESSURE (psi): 1800 NAVIGATION:- SYSTEM

PERFORMANCE: SP 660 TO SP SP 1956 SkyFix STATIONS 685 CONSTELLATION CHANGE CONSTELLATION CHANGE IN USE: SV 3,11,17,15,14, COMMENTS: THOUGHT OUT THE LINE REVERBERATIONS CAUSED MIDNIGHT SHOTPOINT 540. LINE COMMENCED ON BY DEC 04/91 THE SEA BED START: 09:01 HRS FSP: 101 FCSP: 101 TOTAL SP.- 2447 TOTAL KM: 61. 175 END: 14:52 HRS LSP: 2547 LCSP: 2547 TOTAL CSP: 2447 TOTAL CKM: 61. 175 FSP LAT: 13 22 06.75 S FSP LON: 140 30 41.79 E FSP WATER DEPTH: 63 .0 LSP LAT: 13 22 04.49 S LSP LON: 139 56 49.18 E LSP WATER DEPTH: 65 .0 LINE: 91CA-06 AZIMUTH: 270 STATUS: COMP DATE: 05/12/91 OFFSET (M): 78.0 WIND: 5-10 KTS NW SEA: 2 SWELL (M): 0.5 STREAMER:- DEPTHS (M):6+/-l SOL NOISE: 2.8 uBAR AVERAGE EOL NOISE: 2.7 uBAR AVERAGE STATUS: TRACE #188 DEAD FEATHERING : 3.2-0.6 PORT - STBD NEAR 6 GROUPS: 2.2 NEAR 6 GROUPS: 2.1 uBAR AVERAGE uBAR AVERAGE ENERGY SOURCE:- CAPACITY (in3): 1090 PERFORMANCE: SP 1125 GUN #47 OFF DEPTH (M): 6 PRESSURE (psi): 1800 NAVIGATION:- SYSTEM: SkyFix STATIONS IN USE: SV 6,12,13 and 24 PERFORMANCE: SP 1364 SV CONSTELLATION CHANGE. COMMENTS: RECORD QUALITY STILL FAIR TO GOOD START: 17:03 END: 22:54 HRS HRS FSP: 101 LSP: 2540 FCSP: LCSP: 2 101 540 TOTAL SP: TOTAL CSP: 2440 2440 TOTAL KM: TOTAL CKM: 61.000 61.000 FSP LAT: 13 LSP LAT: 13 31 13 33 13 .46 S .46 S FSP LSP LON: 140 LON: 140 31 31 35.77 E 35.77 E FSP LSP WATER DEPTH: WATER DEPTH: 61.0 61.5 OFFSET (M): 78.0 WIND: 10 KTS NW ' SEA: 2 SWELL (M): 1.5 STREAMER:- DEPTHS SOL NOISE: 2.3 EOL NOISE: 2.2 (M):i uBAR uBAR 6+/-1 AVERAGE AVERAGE FEATHERING : .8-3.5 NEAR 6 GROUPS: 2.2 NEAR 6 GROUPS: 2.29 PORT uBAR uBAR AVERAGE AVERAGE LINE: 91CA-08 AZIMUTH: 90 STATUS: COMP DATE: 05/12/91 STATUS: TRACE #188 DEAD DEPTH (M): 6 PRESSURE (psi): 1800 ENERGY SOURCE:- CAPACITY (in3): 1090 PERFORMANCE: SP 1125 GUN #47 OFF NAVIGATION:- PERFORMANCE: SYSTEM: SkyFix FAIR TO GOOD. STATIONS IN USE: SV 3,11,13,17,21 COMMENTS: LOTS OF RINGING ON PAPER MONITORS. START: 01:18 HRS FSP: 101 FCSP: 101 TOTAL SP: 3185 TOTAL KM: 79.625 END: 08:43 HRS LSP: 3285 LCSP: 3285 TOTAL CSP: 3185 TOTAL CKM: 79.625 FSP LAT: 13 17 29.65 S FSP LON: 140 53 17.60 E FSP WATER DEPTH: 44.0 LSP LAT: 13 04 59.56 S LSP LON: 141 35 27.27 E LSP WATER DEPTH: 12.0 OFFSET (M): 78.0 WIND: 10 KTS NW ' SEA: 2 SWELL (M): 1.5 LINE: 91CA-10 AZIMUTH: 073 STATUS: COMP DATE: 07/12/91 FEATHERING : 10.8 PORT -7.3 STBD STREAMER:- DEPTHS SOL NOISE: 1.2 (M):6+/-l uBAR AVERAGE EOL NOISE: 2.9 uBAR AVERAGE NEAR 6 GROUPS: 4.5 NEAR 6 GROUPS: 5.8 uBAR AVERAGE uBAR AVERAGE STATUS: All trace good. ENERGY SOURCE:- CAPACITY (in3): 1090 DEPTH (M): 6 PRESSURE (psi): 1800 PERFORMANCE: SP 2946 GUN# 54 OFF VOL 1050 NAVIGATION:- SYSTEM: SkyFix STATIONS IN USE: SV 11,15,21 14,18 PERFORMANCE: SP 2491 TO SP 2535 LOST DGPS, SHOT ON TIMING 9 SEC INTERVAL. COMMENTS: EDITS: SP# NIL. LINE WAS TERMINATED EARLY DUE TO HAZARDOUS WATER. THIS LINE WAS RE-LOCATED TO OBTAIN A BETTER TIE WITH THE ONSHORE DATA. START: 11:06 HRS FSP: 101 FCSP: 101 TOTAL SP: 2747 TOTAL KM: 68.675 END: 17:44 HRS LSP: 2847 LCSP: 2847 TOTAL CSP: 2747 TOTAL CKM: 68.675 FSP LAT: 12 57 57. 66 S FSP LON: 141 29 01.05 E FSP WATER DEPTH: 25.0 LSP LAT: 13 05 56. 80 S LSP LON: 140 51 54.55 E LSP WATER DEPTH: 48.0 OFFSET (M): 78.0 WIND: 10 kts NU l SEA: 3 SWELL (M): 1 LINE: 91CA-11 AZIMUTH: 257 STATUS: COMP DATE: 07/12/91 STREAMER:- SOL NOISE: EOL NOISE: STATUS: SP DEPTHS

(M):6+/-l uBAR AVERAGE uBAR AVERAGE FEATHERING : 8.5 PORT -6.6 PORT NEAR 6 GROUPS: 2.3 uBAR AVERAGE NEAR 6 GROUPS: 2.4 uBAR AVERAGE 2600 CABLE STRIKE MOVING FROM TRACE 70 TOWARDS TRACE 1. ENERGY SOURCE:- CAPACITY (in3): 1090 DEPTH (M): 6 PRESSURE (psi): 1800 PERFORMANCE: All guns working NAVIGATION:- SYSTEM: SkyFix STATIONS IN USE: SV 2,13,16,19,24. PERFORMANCE: SP 854 RECORDED ON TIMING. SP 1620 RECORDED ON TIMING. SP1767 RECORDED ON TIMING. COMMENTS: EDITS: NIL. MISSED SP 854,855,856,1562,1563,1564,1565,1766 AND 1819. START: 19:54 HRS FSP: 101 FCSP: 101 TOTAL SP: 4686 TOTAL KM: 117.150 END: 07:15 HRS LSP: 4786 LCSP: 4786 TOTAL CSP: 4686 TOTAL CKM: 117.150 FSP LAT: 13 05 31. 94 S FSP LON: 140 51 54.55 E FSP WATER DEPTH: 46.0 LSP LAT: 13 05 38. 21 S LSP LON: 139 49 58.82 E LSP WATER DEPTH: 64.0 OFFSET (M): 77.0 WIND: 10 kts NW SEA: 3 SWELL (M): 1.5 LINE: 91CA-04 AZIMUTH: 270 STATUS: COMP DATE: 08/12/91 FEATHERING : 4.7 PORT -6.0 STBD STREAMER:- SOL NOISE: DEPTHS (M):6+/-l 7.6 uBAR AVERAGE EOL NOISE: 5.4 uBAR AVERAGE NEAR 6 GROUPS: 1.9 NEAR 6 GROUPS: 2.2 uBAR AVERAGE uBAR AVERAGE STATUS: All trace good. ENERGY SOURCE:- CAPACITY (in3): 1090 PERFORMANCE: All guns working DEPTH (M): 6 PRESSURE (psi): 1800 NAVIGATION:- SYSTEM: SkyFix PERFORMANCE: 11,14,18,19 Time recording SP 3097 to 3117 at 9sec. STATIONS IN USE: SV 3,17,21,20.23 COMMENTS: EDITS: SP# Nil. START: 09:25 HRS FSP: 101 FCSP: 101 TOTAL SP: 3655 TOTAL KM: 91. 375 END: 18:06 HRS LSP: 3755 LCSP: 3755 TOTAL CSP: 3655 TOTAL CKM: 91. 375 FSP LAT: 13 13 59. 75 S FSP LON: 139 50 57.15 E FSP WATER DEPTH: 64 .0 LSP LAT: 13 13 24. 86 S LSP LON: 140 41 34.35 E LSP WATER DEPTH: 57 .0 OFFSET (M): 77.0 WIND: 10 kts NW ' SEA: 3 SWELL (M): 1.5 LINE: 91GA-05 AZIMUTH: 089 STATUS: COMP DATE: 08/12/91 FEATHERING : 0.1 PORT -5.4 STBD STREAMER:- DEPTHS (M):6+/-l SOL NOISE: 5.42 uBAR AVERAGE EOL NOISE: 7.53 uBAR AVERAGE STATUS: All trace good. NEAR 6 GROUPS: 2.26 NEAR 6 GROUPS: 2.52 uBAR AVERAGE uBAR AVERAGE ENERGY SOURCE:- CAPACITY (in3): 1090 PERFORMANCE: All guns working. DEPTH (M): 6 PRESSURE (psi): 1800 NAVIGATION:- SYSTEM: SkyFix STATIONS IN USE: SV 6,16,17,20 PERFORMANCE: SP 1151 Singapore Master Station Off. Sp 1390 change constellations SP 1461 change constellation. Sp 1713 change constellations. At SP2554 there was a lOmjump to port. COMMENTS: At SP 2719 onward the SP No’s will need to be relabelled due to missed Sp’s that did not occurred. The SP numbering on the observer report will have to be increased by 4 due to a slight navigation jump that increased the speed of the vessel to lOOkts and the system missed four SP. The SP that are missing are SP 2720,2721,2722 and 2723 therefore SP 2724 is Rec #2720. START: 21:22 HRS FSP : 101 FCSP: 101 TOTAL SP: 843 TOTAL KM: 21.075 END: 23:25 HRS LSP : 943 LCSP: 943 TOTAL CSP: 843 TOTAL CKM: 21.075 FSP LAT: 13 13 24 .86 S FSP LON: 140 41 34.35 E FSP WATER DEPTH: 61.0 LSP LAT: 12 58 35 .08 S LSP LON: 140 28 37.66 E LSP WATER DEPTH: 65.0 OFFSET (M): 76.0 WIND: 10-15 kts NW SEA : 3 SWELL (M): 1.5 STREAMER:- DEPTHS (M) :< 6+/-1 FEATHERING : .0 PORT 3. 4 STBD SOL NOISE: 7 .09 uBAR AVERAGE NEAR 6 GROUPS: 2. 44 uBAR : AVERAGE EOL NOISE: 4 .11 uBAR AVERAGE NEAR 6 GROUPS: 2. 04 uBAR AVERAGE STATUS: All trace good • LINE: 91CA-03 AZIMUTH: 270 STATUS: TBC DATE: 08/12/91 DEPTH (M): 6 PRESSURE (psi): 1800 ENERGY SOURCE:- CAPACITY (in3): 1090 PERFORMANCE: All guns working. NAVIGATION:- SYSTEM: SkyFix STATIONS IN USE: SV 17,21,3 PERFORMANCE:

Cairns DGPS was used during the recording of this line. COMMENTS: EDITS: SP# Nil Termination due to Titan hangup and unable to sent data. START: 01:35 END: 08:17 HRS HRS FSP: LSP: 944 3763 FCSP: 944 LCSP: 3763 TOTAL SP: 2820 TOTAL CSP: 2820 TOTAL KM: TOTAL CKM: 70.500 70.500 FSP LAT: 12 58 35. 36 S FSP LON: 140 29 50.74 E FSP WATER DEPTH: 66.0 LSP LAT: 12 58 32. 23 S LSP LON: 139 49 58.75 E LSP WATER DEPTH: 64.0 OFFSET (M): 79.0 WIND: 10-15 kts NW r SEA: 4 SWELL (M): 1.4 LINE: 91CA-03A AZIMUTH: 270 STATUS: COMP DATE: 09/12/91 FEATHERING : 9.6 STBD-1.5 STBD STREAMER:- DEPTHS (M):6+/-l SOL NOISE: 7.0 uBAR AVERAGE EOL NOISE: 4.31 uBAR AVERAGE STATUS: ALL trace good. NEAR 6 GROUPS: 2.44 NEAR 6 GROUPS: 2.04 UBAR AVERAGE uBAR AVERAGE ENERGY SOURCE:- CAPACITY (in3): 1090 PERFORMANCE: All guns working. DEPTH (M): 6 PRESSURE (psi): 1800 NAVIGATION:- SYSTEM: SkyFix PERFORMANCE: Good constellation STATIONS IN USE: all day, no problem with signals. SV 11,15,14,15,18 COMMENTS: Records quality fair to good. START: 10:22 HRS FSP: 101 FCSP: 101 TOTAL SP: 3659 TOTAL KM: 91.475 END: 18:53 HRS LSP: 3759 LCSP: 3759 TOTAL CSP: 3659 TOTAL CKM: 91.475 FSP LAT: 12 50 00.70 S FSP LON: 139 50 54.45 E FSP WATER DEPTH: 64.0 LSP LAT: 12 50 02.89 S LSP LON: 140 41 34.63 E LSP WATER DEPTH: 63.0 OFFSET (M): 78.0 WIND: 15 kts NW ' SEA: 4 SWELL (M): 1.5 LINE: 91CA-O2 AZIMUTH: 090 STATUS: COMP DATE: 09/12/91 FEATHERING : 4.8 STBD-4.6 STBD STREAMER:- DEPTHS SOL NOISE: 5.5 (M):6+/-l uBAR AVERAGE EOL NOISE: 8.3 uBAR AVERAGE NEAR 6 GROUPS: 2.2 NEAR 6 GROUPS: 2.2 uBAR AVERAGE uBAR AVERAGE STATUS: All trace good. ENERGY SOURCE:- CAPACITY (in3): 1090 PERFORMANCE: All guns working DEPTH (M): 6 PRESSURE (psi): 1800 NAVIGATION:- SYSTEM: SkyFix PERFORMANCE: Sp 2216 Navigation jump to Sp 3251 recording on velocity and STATIONS IN USE: SV 2,13,16,19,24 slightly. Sp 3241 recording time 9.0 sec. the navigation is stable. COMMENTS: Line completed. START: 21:17 HRS FSP: 101 FCSP: 101 TOTAL SP: 3664 TOTAL KM: 91.600 END: 06:04 HRS LSP: 3764 LCSP: 3764 TOTAL CSP: 3664 TOTAL CKM: 91.600 FSP LAT: 12 39 59.19 S FSP LON: 140 40 36.75 E FSP WATER DEPTH: 64.0 LSP LAT: 12 39 59.57 S LSP LON: 139 50 00.59 E LSP WATER DEPTH: 64.0 LINE: 91CA-01 AZIMUTH: 270 STATUS: COMP DATE: 10/12/91 OFFSET (M): 78.0 WIND: 15 kts NW SEA: 4 SWELL (M): 1.5 STREAMER:- SOL NOISE: DEPTHS (M):6+/-l 8.1 uBAR AVERAGE FEATHERING : 1.7 PORT -4.45 STBD EOL NOISE: 5.9 uBAR AVERAGE NEAR 6 GROUPS: 2.2 NEAR 6 GROUPS: 2.2 uBAR AVERAGE uBAR AVERAGE STATUS: All trace good. ENERGY SOURCE:- CAPACITY (in3): 1090 PERFORMANCE: All guns good DEPTH (M): 6 PRESSURE (psi): 1800 NAVIGATION:- SYSTEM: SkyFix PERFORMANCE: Fair. COMMENTS: EDITS: SP# Nil STATIONS IN USE SV 3,17,21,15, ENERGY SOURCE:- CAPACITY (in3): 1090 PERFORMANCE: All guns good. LINE: 91CA-12 AZIMUTH: 180 STATUS : COMP DATE: 10/12/91 START: 08:55 HRS FSP : 101 FCSP: 101 TOTAL SP: 6016 TOTAL KM: 150.400 END: 23:18 HRS LSP : 6116 LCSP: 6116 TOTAL CSP: 6016 TOTAL CKM: 150.400 FSP LAT: 12 34 43 .43 S FSP LON: 139 58 44.36 E FSP WATER DEPTH : 64.0 LSP LAT: 13 56 27 .35 S LSP LON: 139 58 39.19 E LSP WATER DEPTH : 65.0 OFFSET (M): 78.0 WIND: 20 kts NW SEA: 4- -5 SWELL (M) : 2-2.5 STREAMER:- DEPTHS (M):i 6+/-1 FEATHERING : 0.0 PORT -3. 6STBD SOL NOISE: 5.86 uBAR AVERAGE NEAR 6 GROUPS: 2.2 uBAR : AVERAGE EOL NOISE: 6.59 uBAR AVERAGE NEAR 6 GROUPS: 2.1 uBAR : AVERAGE STATUS: All trace good • DEPTH (M): 6 PRESSURE (psi): 1800 NAVIGATION:- SYSTEM:

SkyFix STATIONS IN USE: SV 2,16,18,19,24 PERFORMANCE: Slight Navigation jump SP 1489,2573,2759 due to constellation changes. COMMENTS: EDITS: SP# nil. LINE COMPLETED. LINE: 91CA-13 AZIMUTH: 359 STATUS: COMP DATE: 11/12/91 START: 10:35 HRS END: 18:16 HRS FSP: 101 LSP: 3220 FCSP: 101 TOTAL SP: 3120 LCSP: 3220 TOTAL CSP: 3120 TOTAL KM: TOTAL CKM: 78.000 78.000 FSP LAT: 13 15 56.80 S LSP LAT: 12 33 33.02 S FSP LSP LON: 140 LON: 140 FSP WATER DEPTH: 66.0 LSP WATER DEPTH: 66.0 OFFSET (M): 78.0 WIND: 20 kts NW SEA: 4 SWELL (M): 2-2.5 STREAMER:- DEPTHS (M):6+/-l SOL NOISE: 7.8 uBAR AVERAGE EOL NOISE: 9.20 uBAR AVERAGE STATUS: All good traces. FEATHERING : .5 STBD 3.2 PORT NEAR 6 GROUPS: 2.1 NEAR 6 GROUPS: 2.88 uBAR AVERAGE uBAR AVERAGE ENERGY SOURCE:- CAPACITY (in3): 1090 PERFORMANCE: All guns operational DEPTH (M): 6 PRESSURE (psi): 1800 NAVIGATION:- PERFORMANCE: SYSTEM: SkyFix SP 716 change to Cairns STATIONS from Darwin. Sp IN USE: SV 2,13,16,19,24 1748 Nav jump forward 30m. COMMENTS: EDITS: SP# Nil. Occasional swell noise throughout the streamer moving aft from front. Vessel off line up to 20m during SV constellation changes. STREAMER:- DEPTHS (M):6+/-l SOL NOISE: NA uBAR AVERAGE EOL NOISE: 6.38 uBAR AVERAGE FEATHERING : .8 PORT- 1.1 STBD NEAR 6 GROUPS: NA uBAR AVERAGE NEAR 6 GROUPS: 1.91 uBAR AVERAGE STATUS: SP 810 steamer depth increased to 7m due to excessive swell noise. ENERGY SOURCE:- CAPACITY (in3): 1090 PERFORMANCE: All guns operational. DEPTH (M): 6 PRESSURE (psi): 1800 START: 01:55 END: 08:31 HRS HRS FSP: LSP: 101 3041 FCSP: 101 LCSP: 3041 TOTAL SP: TOTAL CSP: 2941 2941 TOTAL KM: TOTAL CKM: 73.525 73.525 FSP LAT: 13 55 36. 77 S FSP LON: 140 10 53.56 E FSP WATER DEPTH: 66.0 LSP LAT: 13 15 35. 27 S LSP LON: 140 11 04.39 E LSP WATER DEPTH: 66.0 LINE: 91CA-14 AZIMUTH: 000 STATUS: COMP DATE: 11/12/91 OFFSET (M): 78.0 WIND: 25 kts NW SEA: 5 SWELL (M): 2.5 NAVIGATION:- SYSTEM: SkyFix STATIONS IN USE: SV 11,14,21,18,19 PERFORMANCE: COMMENTS: EDITS: SP# Nil. SP 441,442 and 443 unable to record due to tape transport drive problem. LINE: 91CA-15 AZIMUTH: 180 STATUS: COMP DATE: 12/12/91 START: 20:58 HRS END: 11:29 HRS FSP: LSP: 101 6133 FCSP: 101 TOTAL SP: 6033 LCSP: 6133 TOTAL CSP: 6033 TOTAL KM: 150.825 TOTAL CKM: 150.825 FSP LAT: 12 LSP LAT: 13 34 35.58 S 56 31.12 S FSP LSP LON: 140 LON: 140 FSP WATER DEPTH: 66.0 LSP WATER DEPTH: 67.0 OFFSET (M): 79.0 WIND: 15-20 kts NW SEA: 5 SWELL (M): 2.0 STREAMER:- DEPTHS (M):6+/-l SOL NOISE: 4.74 uBAR AVERAGE EOL NOISE: 8.09 uBAR AVERAGE STATUS: Streamer lower to 7.0m FEATHERING : 5.9 STBD 0.4 PORT NEAR 6 GROUPS: 2.82 NEAR 6 GROUPS: 2.70 uBAR AVERAGE uBAR AVERAGE Sp 3791 depth reduce to 6.5m. ENERGY SOURCE:- CAPACITY (in3): PERFORMANCE: Sp 5214 Gun #3 off 1090 DEPTH (M): 6 vol 1040 PRESSURE (psi): 1800 NAVIGATION:- SYSTEM: SkyFix PERFORMANCE: Sp 4648 navigation loss. STATIONS IN USE: SV 2,13,19 4654, 4655, 4657, 4658 and COMMENTS: EDITS: SP# nil. Missed SP 4651,4652, 4652, SP 4659. Streamer was lower due to excessive noise cause by the increasing swell LINE: 91CA-16 AZIMUTH: 000 STATUS: COMP DATE: 13/12/91 START: 15:09 HRS FSP: 101 FCSP: 101 END: 01:51 HRS LSP: 4732 LCSP: 4732 TOTAL SP: 4632 TOTAL CSP: 4632 TOTAL KM: 115.800 TOTAL CKM: 115.800 FSP LAT: 13 36 46.67 S LSP LAT: 12 33 40.13 S FSP LON: 140 23 16.53 E LSP LON: 140 23 18.67 E FSP WATER DEPTH: 65.0 LSP WATER DEPTH: 65.0 OFFSET (M): 78.0 WIND: 20-25 kts NW SEA: 5 SWELL (M):

2.5 STREAMER:- DEPTHS (M):6+/-l SOL NOISE: 7.44 uBAR AVERAGE EOL NOISE: 7.81 uBAR AVERAGE FEATHERING : 2.5 PORT - 0.8 STBD NEAR 6 GROUPS: 2.59 NEAR 6 GROUPS: 2.59 uBAR AVERAGE uBAR AVERAGE STATUS: Swell noise causing excessive noise on streamer. ENERGY SOURCE:- CAPACITY (in3): 1090 DEPTH (M): 6 PRESSURE (psi): 1800 PERFORMANCE: SP 490 Gun#19 off vol 1050Hin. NAVIGATION:- SYSTEM: SkyFix STATIONS IN USE: SV 3,12,16,20,17, PERFORMANCE: Recording on timing SP 1048. Sp 2905 recording using time. SP 2922 change to Darwin and back on Cairns station SP 3026-SP 3645 a jump forward 50m. COMMENTS: Note: SCS Rebooted at RN 4397 filters causing bad data from Rec#4402 Traces #192 to trace #230 from Record #4359 to Record #4397 LINE: 91CA-11A AZIMUTH: 077 STATUS: COMP DATE: 13/12/91 START: 12:36 HRS END: 13:20 HRS FSP: LSP: 111 619 FCSP: 111 LCSP: 619 TOTAL SP: 1018 TOTAL CSP: 1018 TOTAL KM: TOTAL CKM: 25.450 25.450 FSP LAT: 12 57 59.51 S FSP LON: 141 28 53.00 E LSP LAT: 12 56 27.29 S LSP LON: 141 35 52.35 E FSP WATER DEPTH: 25.0 LSP WATER DEPTH: 16.4 OFFSET (M): 78.0 WIND: 20 kts NW SEA: 5 SWELL (M): 2 STREAMER:- DEPTHS (M):6+/-l SOL NOISE: 6.7 uBAR AVERAGE EOL NOISE: 11.5 uBAR AVERAGE STATUS: STREAMER DEPTH HAD TO BE STREAMER DEPTH HAD TO BE FEATHERING : 6.1 STBD 6.0 STBD NEAR 6 GROUPS: 2.8 uBAR AVERAGE NEAR 6 GROUPS: 3.2 uBAR AVERAGE INCREASED BECAUSE OF THE SWELL. DECREASE DUE TO SHALLOW WATER DEPTHS ENERGY SOURCE:- CAPACITY (in3): 1090 DEPTH (M): 6 PRESSURE (psi): 1800 PERFORMANCE: All good STATIONS IN USE: SV 3,12, NAVIGATION:- SYSTEM: SkyFix PERFORMANCE: Fair to Good COMMENTS: HGS recorded this line from the western end to the eastern end nearest the shore. SURVEY COMPLETED

PRINCE ^SS Q0039496 Q0039496 FINAL OPERATIONS REPORT MARINE SEISMIC SURVEY COMALCO ALUMINIUM LTD SURVEY Q/22P 2-D CONFIDENTIAL CLIENT COMALCO ALUMINIUM LTD CONTRACTOR HALLIBURTON GEOPHYSICAL SERVICES, INC. VESSEL M/V MAGNIFICENT CREEK SURVEY Q/22P 2-D DATES 4 DECEMBER 1991 - 13 DECEMBER 1991 C R2 4 7 8 1A TABLE OF CONTENTS SECTION TITLE PAGE I INTRODUCTION - i. Introduction 1.1 ii. Survey Vessel 1.2 iii. Personnel 1.3 iv. Key Survey Parameters 1.4 II TITAN 1000 SYSTEM i. Overview II.1 ii. Digital Fibre Optic Streamer Description i II.2 iii. Digital Fibre Optic Streamer Details II.3 iv. Streamer Control System Description II. 4 V. Streamer Control System Details II. 6 vi. Field Computer System III Description II.7 vii. Field Computer System Details II.8 Ill AUXILIARY INSTRUMENTS i. Fathometer Description III.l ii. Fathometer Details III.l iii. Multi-Trace Plotter Description III.2 iv. Multi-Trace Plotter Details III.2 IV ENERGY SOURCE i. Airgun Array Description IV. 1 ii. Airgun Array Details IV. 3 iii. Tiger II System Description IV. 4 iv. Tiger II System Details IV. 4 V. Energy Source Discussion IV. 5 V NAVIGATION SYSTEMS (1) OVERVIEW V. 1.1 (2) RADIO POSITIONING SYSTEMS i. DGPS Description V.2.1 ii. Skyfix DGPS System Details V.2.2 iii. DGPS System Details V.2.3 iv. DGPS System Calibration V.2.4 TABLE OF CONTENTS SECTION TITLE PAGE V NAVIGATION SYSTEMS Cont. (3) SATELLITE POSITIONING SYSTEM i. Transit Satellite Description V.3.1 ii. Transit Satellite Details V.3.2 (4) CONFIGURABLE MARINE SYSTEM i. CMS Overview V.4.1 ii. CMS Option Details (980B) V.4.2 iii. HGS NAV System Description V.4.3 iv. HGS NAV System Details V.4.4 V. STS III System Description V.4.5 vi. STS III System Details V.4.6 vii. Sonar Details and Discussion V.4.8 viii. Gyro Description V.4.9 ix. Gyro Details and Discussion V. 4.9 X. Navigation Discussion V.4.10 xi. Navigation Tape Summary V.4.11 xii. Navigation Summary V.4.12 VI OPERATIONS i. Offset Calculation VI. 1 ii. Operations Discussion VI. 2 iii. Digital Streamer Discussion VI. 3 iv. Recording Instrument Discussion VI. 4 V. Instrument Tests VI. 5 vi. Statistics VI. 6 vii. Shipment Details VI. 7 TABLE OF APPENDICES APPENDIX TITLE A Line Summary B Field Tape Inventory C Line Status Log D Navigation Field Report PLATE TITLE 1 Streamer Control System 2 FCS III Diagram 3 Streamer Electronics Module 4 Antennae Location Diagram 5 2180 cu.in. Sleeve Gun Array Diagram 6 2180 cu.in. Source Array Diagram 7 240 trace Streamer Diagram 8 Location of Prospect 1.1 I. INTRODUCTION Introduction A 2-D marine seismic survey was conducted by Halliburton Geophysical Services, Inc. for Comalco Aluminium Ltd, between 4 December 1991 and 13 December 1991. The survey was conducted in Australian petroleum permit area Q/22P in the Gulf of Carpetaria. The purpose of the following report is to provide the reader with an insight into methods and equipment used by HGS to collect the data and also to highlight any problems that were encountered during the survey period. Section I.ii consists of statistics of the Motor Vessel Magnificent Creek. Section I.iii contains a list of key personnel involved with the operation and maintenance of instruments and equipment employed in the collection of data. Also those responsible for the assurance of quality and integrity of data recorded. Key survey parameters are outlined in section I.iv. An overview of the instrumentation is detailed in sections II, III and IV. Section II contains a brief description of the theory of operation of HGS's unique equipment. Section IV involves details and discussion of HGS's source array and source timing. A brief description of the operating principles of the various navigation systems, including base station data, system

calibration and navigation tape summary, is outlined in section V. In the final section (VI) all aspects of operational procedures are provided and include shipment details and survey statistics. Three appendices containing a line summary, field tape inventory and line status log, can be found following section VI. A number of plates are attached to this report which illustrate various supplementary details involved with data collection and equipment. 1.2 Flag Home Port Trade Owners Call Sign Length Breadth Depth Draft Official No Gross Tonnage Nett Tonnage Main Engines Electric Power . . . . Load Line Survey Vessel M/V MAGNIFICENT CREEK Australia Fremantle Foreign-going Guardian Marine Services VJLC metres L.O.A. 13.20 metres B.O.A. metres 3.05 - 4.40 metres 3553747A 1272 Tonnes 739 Tonnes 4 x 1100 BHP Diahatsu PSH TC M-26D 2 X 250 Kw KATO 415V 50 Hz Lloyds Register 1.3 Personnel Party Manager . . . Systems Engineer Quality Controllers Survey Operators A. Welfare M. Chen A. Edwards R. Mervin R. Hodson J. Sheerin System Operators .... . . T. Moojen D. Osborne Y. Amundsen Compressor Engineer . . . . . A. Temmen Source Mechanics .... . . R. Johns J. Mason G. Constant I. Donjerkovich Master . . R. Ridsdale Vessel Supervisor .... . . L. Williams UMS Representative . . . . . I. MacDonald Navigation (Racal) . . . . . S. Bradley Client Representative . . . . R. Romanik R. Meaney 1.4 Key Survey Parameters Parameters Dual or Single Single Groups per Streamer 240 Group Interval 12.5 Metres Nominal Streamer Offset 79 Metres Streamer Depth 6 Metres Nominal Depth Interval 300 Metres Streamer Tracking (Yes/No) ... No Nominal Compass Interval .... 300 Metres Feather Angle ( Max ) 10 Degrees Instrument Parameters Sample Interval Record Length Hi-cut Filter Lo-cut Filter Source Parameters 2 Milliseconds 4 Seconds 180Hz-72dB/Octave 8Hz-18dB/Octave 1090 Cu. In. 6 Metres 14 Metres 16.66 Metres Parallel 2 1800 P.S.I. Array Volume Array Depth Array Length Array Spread Array Formation Number of Strings Nominal Pressure 1.5 iv. Key Survey Parameters Cont. Navigation Parameters Shotpoint Interval Line Begin Extension Line End Extension Primary Navigation 25.00 Metres -4 SP +4 SP Differential GPS The following parameters were used the local datum of AGD 66; to convert WGS84 to Reference Spheroid Semi-Major Axis . Semi-Minor Axis . Flattening . . . Australian National 6378160 m. 6356774.719 m. 1/298.25 Reference Spheroid Semi-Major Axis . Semi-Minor Axis . Flattening . . . World Geodetic 1984 6378137 m. 6356752.31 m. 1/298.257223563 Geodetic Reference Datum . . . . False Eastings False Northings Longitude of Central Meridian . . Scale Factor on C.M Australian Geodetic 1966 500000 m. 10000000 m. 141 degrees East 0.999600 SECTION II TITAN 1000 SYSTEM CR2478 1A II.1 II. TITAN 1000 SYSTEM i. Overview The Titan 1000 recording system comprises three subsystems; the Digital Fibre Optic Streamer (DFOS), the Streamer Control System (SCS), and the Field Computer System III (FCS III). The DFOS is the in-water portion of the system while the SCS and the FCS III comprise the onboard instrumentation. Each of these subsystems are functionally described and their key features highlighted in the following sections of this report. II.2 ii. Digital Fibre Optic Streamer - Description The 480 Channel Digital Fibre Optic streamer consists of four major in water elements; Live Sections, Program Plugs, Streamer Electronic Modules (SEM) and Repeater Modules. The M/V Magnificent Creek's streamer was configured as shown on the streamer diagram appended to this report. The three major components making up each "cluster" are a SEM positioned between a Live I and a Live II, with each Live section containing 6 separate

groups. Each group contains 32 acceleration-canceling "dish" type hydrophones. The Program Plug, positioned midway in every Live section, has a twofold function. Firstly it determines whether the section is a Live I or a Live II, depending on which type of plug is installed in the section. Secondly it determines the trace "mix" (1:1, 2:1, 3:1 or 5:1) of the particular cluster. Signal processing in the streamer is performed by the SEMs. Each SEM processes 12 groups of analog data from the adjacent section(s). Signal processing consists of preamplifying, filtering, multiplexing, gain ranging and analog to digital conversion. The analog data is always sampled by the SEM at a 1 millisecond sample rate and preamplified with a low noise charge amplifier. Each channel may be filtered with a choice of low cut filters and then applied to a fixed 256 Hz, 72dB/octave anti alias filter. It is then multiplexed, gain adjusted with a quaternary gain instantaneous floating point amplifier and converted to digital form by a 14-bit plus sign, successive approximation, A/D converter. The digital data is added to the incoming data stream, from the previous SEMs, for transmission by one of two optical fibres to the next SEM. Each optical fibre is capable of handling 252 seismic channels at 1 millisecond sample rate. Besides seismic data, four channels of SEM auxiliary data containing depth, test oscillator and DC offset information (one channel is grounded to provide further crossfeed isolation for the DC offset channel) are digitized and added to the data stream. Configuration and control of the SEMs is provided by the streamer control system via the command bus. Power for the streamer is provided by the streamer power system via the power bus. iii. Digital Fibre Optic Streamer - Details Length 3000 Metres Group Interval 12.5 Metres Live Section Length 75 Metres Stretch Section Length 100 Metres SEM Module Length 0.46 Metres Repeater Module Length 0.3 Metres Streamer Trace Mix 001-240 2:1 Mix Hydrophones per Group 32 Hydrophone Interval Linear, 1 phone/ 0.3906 m Hydrophone Type TI - ACR No. of Stretch Sections 1 Front, 1 Tail Skin Type Polyurethane Depth Transducer Location .... In all SEMs & compass/birds Depth Controllers Location . . . Trace #s 1, 13, 37, 61, 85, 109, 133, 157, 181, 205, 229, 235. Near Group 240 Streamer Sensitivity 53.4 gv/Aibar Near Trace Average Offset .... 79 Metres iv. Streamer Control System - Description The Streamer Control System provides the means of controlling the streamer, acquiring the streamer data and formatting the data into a form suitable for the FCS III. The SCS comprises three major sub-assemblies; the DMI chassis and two identical chassis containing the digital filter hardware for signal processing. The SCS is considered as one unit in the following functional description. The SCS is composed of several functional blocks. They are the streamer interface, data I/O interface, signal processing reproduce data, status processing and control functions. The streamer interface allows the streamer control system to receive data from a conventional analog streamer or from a digital streamer. The streamer interface may also receive test data from a streamer test unit via optical fibre and simulated data patterns from a streamer simulator. The streamer interface sorts and distributes the input data onto two 8-bit input data buses. The seismic data I/O port (SIDIOP) receives raw data from the streamer interface via the input data bus, embeds a timing signal into the data and pipelines serial data to the signal processing function. It receives the serial, filtered, data back from the signal processing function, converts it to parallel data, and passes it to one of the two data buses. The signal processing function receives raw SEM data from the data I/O

interface, prepares the data for the digital filters, applies digital high-cut and DC offset filters, converts the data back to serial form and transmits the data to the FCS III. The data are also returned to the I/O interface, converted to parallel format and placed on the output bus for access by the reproduce function. The reproduce data function allows the user to select input data received as raw, unfiltered data from the streamer interface and filtered data from the data I/O interface. It provides optional reproduce processing of selected input data and outputs to four display devices. Two multiplexed displays, each with 312 channel capacity, are provided to a dual channel oscilloscope for real-time quality control of the entire streamer. The observer may select raw data from a portion of the streamer to be displayed in conjunction with the same data channels of filtered data. II.5 iv. Streamer Control System Cont. Reproduce data may be transmitted to a digital camera for a paper display of up to 512 data channels. Two user selectable single trace display outputs can be sent to a single trace profiler. User configurable, high cut and low cut filters, specifically for single trace displays, may be selected. Seismic data or streamer noise data is output to a spectrum analyzer for real-time frequency domain analysis. The status processing function receives status and error information from the streamer interface via parallel data bus. The status and data bits are displayed on an LED display panel. The control function allows operator commands and configuration to be input via video display terminal. It maintains the system software that controls the application of the configuration commands to the streamer interface, data I/O interface, reproduce data, streamer simulator and status processing functions via control bus. Configuration and control of the signal processing function are provided via an RS-232 serial link. The display terminal is also connected to the control function via an RS-232 interface. The control function provides an interface to a Winchester hard disk unit to facilitate storage and control of system software. A floppy disk unit is provided to back up the Winchester and download new software releases. A line printer provides hard copies of configuration disk files. Manufacturer Operating System SCS Software Gain Control Mode Sample Interval Record Length Recording Delay Preamplifer Gain Dynamic Range Filters Selected Time Zero Source . . Texas Instruments Motorola VersaDos version 4.6 Version 2.22 I.F.P. 2 Msec. 4 sec. 0 sec. 0.535 115 Db (referred to input noise) Hi-cut 180Hz-72dB/Octave Lo-cut 8Hz-18dB/Octave Field Time Break II.7 vi. Field Computer System III - Description The FCS III is the final subsystem of the TITAN 1000. The FCS III receives serial data from the SCS and records it to tape. The FCS III provides trace sequential recording of up to 480 channels of seismic data at a 1 millisecond sample rate. It contains the necessary circuitry to receive, store, format, write to magnetic tape, digitally check and reproduce read-after-write records. The FCS III is divided into five major rack mounted subsystems plus peripherals. They are the Gould 32/2705 Computer, Gould I/O Expansion, Zitel Mass Memory, Amplifier Controller. The recording system receives the seismic data from the Streamer Control System (SCS) via Ethernet links. The data may then be resampled to 2 or 4 milliseconds, if required, prior to formatting and demultiplexing. Trace headers are applied prior to writing data from mass memory to tape. The recorder initiates recording by first writing the record header and then pulling the seismic data trace sequentially from mass memory and writing these to tape. The mass memory stores data in one buffer while data is extracted from the other and recorded on

tape. Data is passed to a pair of Aspen A480 dual controller and cartridge drives. This sub-system consists of two controllers and four drives, with one controller in operation all the time and the other a backup unit. Each system has a built in microprocessor with its own software to control data buffering, tape drive operations and error recovery procedures. The sub system tape drives are self loading and self threading units that utilise IBM 3480 compatible cartridges and write to these tapes up to 37871 BPI. A C.Itoh CI-800Q graphics band printer is used to produce the single trace profile during data recording. An OYO GS-622 multi-trace plotter is interfaced via the Fastbox subsystem to the recording system. It gives a permanent visual display of all the traces of a selected recorded file, when requested by the Titan operator. II.8 vii. Field Computer System - Recording System Software Version Tape Format Channels (on tape) Sample Interval Record Length Dynamic Range Polarity Details Field Computer System III HGS SYS 11 SEG D. 2.5 Byte Group Coded Recording 37871 b.p.i. 254 (includes 12 aux, 2 Q.C.) 2 Msec. 4 Seconds 115 dB (referred to input noise) Positive pressure gives negative number on tape as per SEG convention SECTION III AUXILIARY INSTRUMENTS III.l Simrad EA 1498 m/sec. 2.4 m aft 4.2 m. May 1990 III. AUXILIARY INSTRUMENTS Fathometer Description The Simrad EA Hydrographic Echosounder is capable of precision depth measurements in waters ranging from the extremely shallow, down to approximately 1000 - 1200 metres. (Extreme range 1700 metres.) It has an 8 inch dry paper recorder which records scale lines and bottom echo simultaneously. The recorder has four basic ranges of 50, 100, 250 and 500 metres, each with four phased ranges for recording from 0 - 1700 metres. The sounder is also equipped with a digital depth display, and has an external plug connection to allow transfer of depth data to the CMS for logging purposes. Fathometer Details Manufacturer Model Water Velocity Value Transducer Position (with respect to CNP) Draft Correction Calibrated III.2 Multi-Trace Plotter Description The OYO GS-622 is a 22 inch thermal plotter capable of producing high quality wiggle trace and variable area displays of all data traces and auxiliaries. The Du Pont Fastbox system, to which the plotter is interfaced, is a high speed rasterizer which converts trace sequential seismic data to rasterized data for plotting. It does so at speeds which allow the plotter to run at fully rated output. Operator control of plot parameters is via keyboard entry from a CRT display terminal. Multi-Trace Plotter Details Manufacturer Model Number of Channels Plot Rate Timing line periods Trace # Annotation Display Mode Traces per Inch Polarity OYO Corporation GS-622 512 max 2.5in per sec. Light Lines :- 20 Msec Heavy Lines :- 1 Sec At the start of the header at every 12th trace "On Line" Variable Area "Noise Strips":- Wiggle Trace "On Line" :- Variable "Noise Strips":- 15 Positive pressure downbreak SECTION IV ENERGY SOURCE IV. 1 IV. ENERGY SOURCE Airgun Array - Description The Versatile Source Array (VSX) incorporates a new type of airgun; the sleeve gun. The sleeve-gun incorporates a new concept in airgun design in that the shuttle is an external sleeve that produces a full 360 degree port. This allows a more efficient acoustical pulse than the traditionally ported airgun. Three chambers control the movement of the shuttle. These are the air-spring return chamber, the firing chamber and the main chamber. The air-spring chamber is constantly fed by the air supply through the fill passage. Its purpose is twofold: first, it holds the shuttle closed when the gun is not firing and second, it provides a spring return, or recoil, to return the shuttle to its firing

position. The firing chamber controls the firing of the airgun. It is fed by a solenoid valve which is normally in the closed position. When an electrical pulse is sent to the solenoid valve, the valve opens and supplies air to the firing chamber. This creates a force imbalance that opens the shuttle. Once the shuttle is completely open, small exhaust ports in the firing chamber dump the air pressure. Once this chamber and the main chamber have exhausted, the shuttle returns to the closed position. The main air chamber is exhausted very rapidly to create an explosion or acoustic blast. This chamber also contributes a majority of the opening force on the shuttle, causing the shuttle to open quickly. As soon as the firing chamber has moved the shuttle far enough to break the face seal between the shuttle and the chamber sleeve, the high pressure air rushes under the shuttle flange, thus exposing a much greater area to the chamber pressure. This is by far the greatest force acting on the shuttle. After the shuttle has opened fully, there is no longer any pressure in the main chamber or the firing chamber. The pressure in the air-spring chamber is sufficient to close the shuttle. IV. 2 i. Airgun Array - Description Cont. To ensure accurate timing, the sleeve gun incorporates a ring of magnets in the top of the shuttle. As the shuttle moves towards the timing coil, located in the cap of the gun, an electrical pulse, termed the shuttle pulse, is generated and returned to the Texas Instruments Airgun Controller for timing control. The VSX source comprised four strings of Sleeve guns comprising a 2180 cubic inch array. Each sub-array included three low pressure open ended air lines so that the depth could be monitored by means of static air pressure at all times. The arrays were floated with the use of plastic Norwegian buoys. This enabled the sub-arrays to ride at the contract specified depth. The Texas Instruments Airgun Controllers (TIGER II) monitored the firing of each airgun in each of the sub-arrays. Individual gun firing times were continuously controlled to give phasing within +/- 1 millisecond to ensure maximum pulse amplitude and front-to-back ratio. The TIGER II also performed a quality control function by indicating with individual gun LED displays, the status of a gun if it was not operating correctly ie. a self-fire or no fire. The airguns performances were logged on both the CMS navigation tape and printer log. VSX Sleeve Airguns Texas Instruments 10, 20, 40, cu in. 2180 cu. in. 64 4 14 m / Parallel 8.3/8.3/8.3m 67 Metres 1800 P.S.I. Operating Depth 6.0 m. +/- 1.0 m. Airgun Array - Details Gun Type Manufacturer . . . Individual Gun Sizes Operating Volume Total available Air Guns Number of Strings Length of Array/Type Array strings spread Stern to Array Centre Operating Pressure Timing Control Firing Delay Compressors . Tiger II 51.2 Msec. Sullair (l spare) PB-44 (2 spare) IV. 4 Tiger II System - Description The Texas Instruments Airgun Controller (TIGER II) is a microprocessor controlled unit that supervises all timing, firing, and control functions for an airgun array of up to 64 airguns. The Tiger II monitors the shuttle pulse of each airgun and continuously adjusts individual gun firing times to synchronise the array within a 2 millisecond standard deviation for optimum pulse amplitude and front-to-back ratio of the array. A fire sequence is initiated on receipt of wire blast from the recording instruments. The Tiger II returns Field Time Break (FTB) to the recording instruments and fires the guns 51.2 msec later. When used with a digital streamer, the Tiger II synchronises FTB with the digital streamer data. This synchronisation function is called "multiplex streamer mode". The Tiger II maybe operated independently in stand-alone mode or it may be operated in computer mode via a link to the CMS III. Stand-

alone mode enables all normal gun control functions to be implemented from the front panel keyboard. The air gun array is unaffected by the selection of stand-alone mode insofar as actual performance is concerned, however performance monitoring is limited. The computer mode link to the CMS III facilitates data logging of individual gun performance in real time as well as the production of graphically presented performance statistics at the end of the line. Tiger II System - Details Manuf acturer Texas Instruments Tiger II 64 51.2 Msec. Version 1.3 Model Max channels Timing delay . . Firmware release Energy Source Discussion Initially a conventional tow array was used with a spread of 25 metres between the two outer arrays changing to the use of half an array. This was achieved by utilising either the port inner and stbd outer or port outer and stbd inner guns forming an array of 1090 cubic inches. Whichever array was in use for any particular line this was annotated on all associated logs. At the clients request, a small portion of line 91CA-01 had the full array of 2180 cubic inches active with the majority of the line having the normal 1090 cubic inch array. All associated logs were annotated with the relevant shotpoint numbers and source volume. Routine compressor and airgun maintenance was carried out by Halliburton Geophysical Services personnel during line change periods, therefore any downtime was kept to a minimum. There were no problems encountered with the source array or Tiger Control System throughout the period of this survey. SECTION V NAVIGATION SYSTEMS PART 1 OVERVIEW CR24781A V. NAVIGATION SYSTEMS 1. OVERVIEW The navigation function on the survey was performed by a combination of Halliburton Geophysical Services (HGS) equipment and Racal Survey Limited's (Racal) equipment. Racal supplied the Differential Global Positional System equipment (DGPS), which provided positional data for input to the HGS Configurable Marine System (CMS). This utilises the DGPS position data to navigate in real time, perform all line control functions and record the raw navigation data to magnetic tape. Further details concerning more specific aspects of the DGPS and CMS systems are set out in further sections of this report. SECTION V NAVIGATION SYSTEMS PART 2 RADIO POSITIONING SYSTEMS CRZ 4/8 1A V. NAVIGATION SYSTEMS 2. RADIO POSITIONING SYSTEMS i. DGPS - Description The Differential Global Positioning System (DGPS) satellite-based navigation system consists of a constellation of high altitude satellites orbiting the earth every 12 hours, ground-based monitor and control stations and user equipment which may be located on the land, sea or in the air. The satellites are located in six different orbital planes inclined approximately 63 degrees to the equator, at altitudes of 20 degrees, 190 kilometres above the earth's surface. The Trimble Navigation Model 4000AX GPS locator provides high accuracy, 3-dimensional positioning and velocity, based on the Navstar Global Positioning System (GPS). This system has been developed by the U.S. Department of Defense. The basic measurement from the GPS receiver is that of the apparent propagation time of a timing mark from the satellite to the receiving antenna. By making this measurement from four satellites the user's position, ie. latitude, longitude and altitude, can be determined. By measuring the rate of change of range (range-rate) the user's speed and heading can also be determined. This measurement is made more accurate by utilising the doppler shift effect of the carrier. As the satellite positions are measured to within a few metres and the satellite clocks are calibrated to within a few nanoseconds, accurate positional data, with an absolute accuracy of less than 15 metres is possible. The

Model 4000AX operates on the civilian L-band C/A code transmissions from the Navstar constellations. Latitude, longitude and altitude determinations are based on World Geodetic Spheroid (WGS-84) coordinates. The receiver automatically acquires and simultaneously tracks up to ten satellites; measures ranges and range-rates and then computes position, velocity and time. V.2.2 Skvfix DGPS System - Details The Skyfix system utilised Inmarsat communication satellites as a datalink to receive differential corrections. The system used onboard incorporated two reference stations, one situated in Cairns and the other in Darwin. These provided range correction data for up to eight satellites simultaneously. Corrections, which are computed at the two stations are communicated to the Singapore Control centre via Inmarsat. Singapore Control monitors the corrections for performance and quality. From there a composite message containing full RTCM 104 formatted data from all reference stations is passed to two Inmarsat earth stations at Centosa and Perth to be uplinked and broadcast over the Pacific and Indian Ocean region satellites respectively. The vessel operated the Skyfix system through two separate systems for the reference stations Cairns and Darwin. Two Sea Tel Aventex AR 150005 satellite receivers, received the L-band 1.5 GHz frequencies of the Inmarsat system. This data was linked to a Racal Satellite Demodulator and from this interfaced to the Compaq 386 operating the Trimble DNAV software. V.2.3 Trimble 4000AX 1227.6 MHZ Racal Survey 17 m. 0 m. DGPS System - Details Type Frequency Survey Company Antenna Height (above sea level) Antenna Location from C.N.P. . . DGPS System Calibration Conventional RPS calibration procedures and checks such as calibration over a fixed baseline or baseline crossings were not considered relevant to this survey because of the way DGPS operates. The onboard system was initially calibrated to a surveyed bollard on Darwin wharf whilst the vessel was alongside on the 1 December 1991. The drift was constantly monitored depending on GPS coverage, using the DGPS system and updates applied to the onboard system whenever it became necessary. The calibration procedure was performed as follows: Trimble 4000AX GPS receivers were installed at the Cairns and Darwin bases. The antennaes were mounted over known geodetic points whose WGS-84 coordinates were stored in the GPS receivers. As the available constellations were tracked the delta values of latitude, longitude and altitude between the reference coordinates and the GPS determined coordinates were transmitted and received onboard via the Inmarsat communication system. These deltas were in the form of semi-circles (10 semi circles = 9.4 metres). The IDs of the satellites in use were also transmitted via the Inmarsat system. The constellations used in determining a position had to contain no fewer than four satellites, each of which had to have elevation angles above the horizon greater than 10 degrees. The Position Dilution of Precision (PDOP), which is a measure of the magnification of error caused by the satellite geometry, had to be less than 4 to be useful. These constellations had to be tracked by both the vessel's and the earth station's Trimble 4000AX receivers. Another Trimble 4000AX GPS receiver was installed on the vessel and interfaced to the DGPS system; which was, in turn, linked to the NAVCOMP computer. The DGPS system monitored the real time differential data and the constellation being tracked by the reference GPS receivers. The real-time differential data was automatically applied to the mobile GPS WGS-84 position and a corrected set of WGS-84 coordinates were calculated. The corrected WGS-84 coordinates were transformed into the

local datum, in use. The computed ranges from the derived local datum were compared with the observed ranges with a resultant difference (delta), between the two, being displayed. SECTION V NAVIGATION SYSTEMS PART 3 SATELLITE POSITIONING SYSTEM CR24781A V. NAVIGATION SYSTEMS 3. SATELLITE POSITIONING SYSTEM Transit Satellite - Description Transit satellites, which are maintained by the United States Navy, are continuously orbiting the earth, transmitting data that describes their current position. The MX 1107 Satellite Receiver acquires all satellite information automatically. When two or more satellite signals are available at the same time, the MX 1107 tracks the one offering the best signal. The MX 1107 receives two signals from the satellite (150 and 400 MHz) which it in turn converts to digital form. This information is sent to a processor which calculates the vessel's present position based on the data received and the doppler shift as the satellite passes. Between satellite passes (approx 35 to 100 minutes), the processor continually calculates and displays vessel's position by dead-reckoning, based from the last satellite fix position update and the vessel's speed and heading. The satellite also transmits Greenwich Mean Time (GMT) which is stored by the processor until it gets updated by the next satellite update from a good pass. After each useable satellite pass the MX 1107 automatically and continuously displays updated data comprising the vessel's latitude and longitude and will continue dead-reckoning until the next good satellite pass. Transit Satellite System - Details MAGNAVOX MX 1107 Satellite Receiver Manufacturer Magnavox Model MX 1107 Type Receiver frequencies Antenna height Antenna Location from CNP . . . . Sensitivity Tuning Transit Sat Receiver 150 and 400 MHz 15 m. 2.5 m. @ 070° -145 dBm Automatic/programmed In order to convert coordinates following parameters were used: from WGS-72 to AGD-66 the DELTA X = 137 m. DELTA Y = 50 m. DELTA Z = -150 m. The MX 1107 receiver was interfaced directly into the HGS NAV computer for the purposes of navigation quality control. Transit satellite data was not used for survey navigation. All satellite fixes were recorded to magnetic tape and printed out on the ADL (Automatic Data Log) printout. SECTION V NAVIGATION SYSTEMS PART 4 CONFIGURABLE MARINE SYSTEM III CR24781A V.4.1 V. NAVIGATION SYSTEMS 4. CONFIGURABLE MARINE SYSTEM III i. Overview The Configurable Marine System (CMS III) is at the centre of data collection operations. Although the most visible function of the CMS III is survey control and navigation data recording, the system also collects and records data from a variety of sources. The CMS III comprises a central TI 98OB mini-computer networked to 2 TI 990 based sub systems. Various peripheral systems are interfaced directly to the 980B computer or to one of its 990 subsystems. The major functions of the 980B central computer are: record all ancillary data on its peripheral tape transports, provide seismic line control, provide data to the ADL log for real-time quality control, provide selectable data over an external Quality Control link (XQC) and drive a graphical plotter for steering guidance. The 980B computer has an operator interface provided by the 990 QC subsystem. The operator interface is used to enter line control parameters and prospect level parameters. A subset of the data recorded to tape are routinely passed to the 990 QC and displayed on a VDU, the same data are passed to the Automatic Data Logger (ADL) for quality control. Additionally the 990 QC allows the operator to interrogate the 980B at any time for additional data. The second 990 based subsystem is the OBB/STS/TIGER system.

This 990 based mini computer runs under the DX10 multitasking operating system which allows the computer to perform its three major tasks as though they were running on separate machines. The three functions are streamer tracking, realtime binning and TIGER II quality control. These three functions are described more fully in a later section. The third major sub-system of the CMS is the HGS NAV navigation computer. A Compaq 386 desktop computer which receives raw navigation data, eg. range data, GPS position data, sonar velocity data or gyro data and supplies a computed position to the 980B for line control. V.4.2 ii. CMS Option Details (9 8 0B) TI 980B Texas Instruments CMS 10.00.41 CMS III Control Computer Manufacturer Software Version The following options of the CMS III were active during the survey: Magnetic Tape Subsystem Yes Great Circle Navigation Yes Sonar Subsystem No Gyro Subsystem Yes Tiger Subsystem Yes Titan 1000 Subsystem Yes Streamer Tracking Yes CDP Steering No Offset Sensor No Fathometer System Yes Magnetometer Subsystem No Gravity Subsystem No XQC Subsystem Yes Time Reference UTC V.4.3 HGS Navigation System - Description The HGS NAV sub-system of the CMS III performs all navigation tasks. The system navigates in real-time from raw range data supplied by external Radio Positioning Systems or position data supplied by Global Positioning Systems. For radio positioning systems, unfiltered ranges are passed by the HGS NAV system to the 980B for recording on magnetic tape and for printing on the ADL printer. Alternatively, shotpoint position data derived from GPS systems is recorded on tape. Filtered position and velocity data are also passed to the 980B for use by the line control task. The HGS Nav system comprises a Compaq 386SX, 20 MHz desktop computer with maths co-processor operating Concept System navigation software, designed specifically for HGS. All navigation data is interfaced through the Universal Marine System. This unit is a data acquisition system providing an interface between selected navigation systems, marine survey sensors and a host computer. 20 Mhz, 386SX Compaq Concept HGS NAV 201.1.10 Slot # Base Format V.4.4 HGS Navigation System - Details Navigation Computer Manufacturer . . . Software Version Slot Assignments AUX COM3 AUX COM 3 SPECIFICATION 133.0 m. 48.0 m. -148.0 m. LAT. - WGS 84 LONG.- WGS 84 WGS-84 TO AGD-66 CONVERSION Delta X Delta Y Delta Z These transformation parameters are used solely to transfer WGS-84 satellite fixes into the local datum. Spheroid in use Australian National Geodetic Reference Datum .... AGD-66 Streamer Tracking System III - Description The Streamer Tracking System (STS III) is a marine data gathering system that acquires and processes magnetic heading and streamer depth .data from digital compasses and depth transducers located on the streamer. Processed streamer tracking data are combined with other navigation data and displayed on video terminals in a combined graphical and text format. Raw streamer tracking data are transmitted to the CMS III for recording on magnetic tape for subsequent post mission processing. The raw data are also printed on the ADL terminal for quality control in real-time. A number of parameters are entered into the system to define the streamer and source configuration. The parameters are used in real time for streamer tracking, and they are also written to tape for post processing. The key parameters are listed in the following sub-section. STS III System - Details The following data describes the streamer and compass configuration of the STS III to allow it to perform its streamer track function. Tabulated below is the configuration of the depth controller/compasses at the

beginning of the prospect. Any changes that were made during the survey period were noted accordingly in the relevant logs. STS BCU ASSIGNMENTS SEQ # BIRD SER # 1. 6821. 2. • • 6011. 3. • • 4020. 4. 4022. 5. 9 • 5659. 6. • • 5895. 7. • • 3051. 8. 3138. 9. 6839. 10. 3630. 11. 5748. 12. 6050. CMS DEPTH BCU # ASSIGN • 65. . . 01. • 66. 02 . • 67. 03. * 68. 04 . 69. 05. 70. 06. 71. • 07. • 72. 08. « 73. • 09. • 74. 10. 75. 11. 76. 12. COMPASS ASSIGN OFFSET TRACE (M.) NUMBER . 01. . . 2925. . . . 1 . 02. . . 2775. . . .13 . 03. . . 2475. . . .37 . 04. . . 2175. . . .61 . 05. . . 1875. . . .85 . 06. . . 1575. . . 109 . 07. . . 1275. . . 133 . 08. . . .975. . . 157 . 09. . . .675. . . 181 . 10. . . .375. . . 205 . 11. . . . 75. . . 229 . 12. . . . .0. . . 235 vi. STS III System - Details Cont. Streamer length 3000m. Total Number of Traces 240 Line Spacing N/A Bin Width N/A Spec Depth 6 m. Spec Depth Range +/-1 m. Max Change in Heading per 100 Mtrs 5 Deg. Tow Point to Near BCU Distance 232m. Common Nav Point (CNP) to Stern 29.8 m. Stern to Airgun Distance (Centre) 67 m. Tow Point to Near Group Distance (Centre) .... 146 m. Tow Fixture Available No Wide Tow Option No Steering Parameter (CNP, Near, Dist frm Towpt) . CNP Gyro Correction 0 Yaw Correction 0 Magnetic Declination 3.5° East Software version used in the STS III was STS v 7.2 Sonar Discussion and Details Due to a modification update program being carried out, the sonar system was not available for use throughout the period of this survey. V.4.9 The Mark 227 Gyrocompass azimuth reference system. provided an accurate true north The syncro outputs of the MK 227 vi i i. Gyro Description Gyrocompass were connected directly to syncro-to-digital converters in the CMS III. The gyrocompass contains a gyroscope controlled in a manner to make it seek and continually align itself with the meridian. An external gimbal system mounts the gyrocompass binnacle to provide a pendulously stabilized horizontal reference plane for azimuth data. The gyrocompass consists of two major assemblies, the Master Compass and the Pedestal. The Master Compass comprises an oil filled hermetically-sealed binnacle containing the sensitive element. Mechanical and electronic systems compensate the gyrocompass for errors associated with latitude and velocity. A servo follow up system maintains the phantom yoke aligned with the gyrosphere. The Pedestal serves as a support for the Master Compass and provides a housing for the electronic control assemblies and power supplies. Gvro Details and Discussion Manufacturer Sperry Marine Systems Model Mark 227 Mod 0 Gyrocompass The gyro performed continually throughout the whole prospect without problems. Navigation Discussion The main problem encountered with the primary navigation system of DGPS was the poor periods of coverage. Constellation changes from four to three satellites and periods of poor elevation produced, at times, very poor positioning or periods of no positioning. Lines were generally affected with localised movement to Starboard or Port, or poor shotpoint spacing. This was characteristic of poor PDOPS or constellation changes. Lines affected are detailed in a summary which will aid navigation processing with any areas of signifigant jumps or loss of position. During periods in which no positioning was available, shot control of the line was changed from distance to time of an appropriate value relative to our last computed velocity. Navigation processing will find gaps in positioning on most lines. These gaps, where no correct lat/long is available, generally are about 10 shotpoints in duration and occur 1-3 times on a line. There are, however, larger periods of non positioning on a small number of lines, the largest gap being approximately 1.2 kilometres on line 91CA-07. This example is the exception rather

than the rule. This, as with all such anomalies, are detailed in the summary. Interpellation or alternative techniques will be required in processing these areas. Another problem which presents itself from these periods is shotpoint relabelling. This is due to the DGPS system computing incorrect positions and subsequently causing jumps of greater than 100 metres. When incorrect positions of distances of hundreds of metres are accepted by the HGS Nav, the computed velocity causes the CMS to believe large groups of shotpoints have been missed. Due to this relabelling will be a necessity. Future launching of additional GPS satellites should eliminate the above faults from occurring, providing fuller coverage and improved constellation geometry which will greatly improve the DGPS accuracy Lastly datum conversion from WGS 84 to AGD 66 has already been computed within HGS Nav software. The coordinates recorded to navigation tape are in the AGD 66 datum. Datum shift parameters are listed in the earlier in the report. Navigation Tape Summary TAPE # LINE # DATE 000360 91CU-02 -> 91C1-01 04/12/91 -> 04/12/91 000361 91CU-17 -> 91CA-17 04/12/91 -> 05/12/91 000362 91CA-06 -> 91CA-06 05/12/91 -> 05/12/91 000363 91CA-08 -> 91CA-08 05/12/91 -> 05/12/91 000364 91CA-09 -> 91CA-09A 06/12/91 -> 06/12/91 000365 91CA-07 -> 91CA-07 06/12/91 -> 06/12/91 000366 91CA-10 -> 91CA-10 07/12/91 -> 07/12/91 000367 91CA-11 -> 91CA-11 07/12/91 -> 07/12/91 000368 91CA-04 -> 91CA-04 07/12/91 -> 08/12/91 000369 91CA-04 -> 91CA-05 08/12/91 -> 08/12/91 000370 91CA-05 -> 91CA-03A 08/12/91 -> 09/12/91 000371 91CA-02 -> 91CA-02 09/12/91 -> 09/12/91 000372 91CA-01 -> 91CA-01 09/12/91 -> 10/12/91 000373 91CA-12 -> 91CA-12 10/12/91 -> 10/12/91 000374 91CA-12 -> 91CA-12 10/12/91 -> 10/12/91 000375 91CA-14 -> 91CA-14 11/12/91 -> 11/12/91 000376 91CA-13 ~> 91CA-13 11/12/91 -> 11/12/91 000377 91CA-15 -> 91CA-15 11/12/91 -> 12/12/91 000378 91CA-15 -> 91CA-15 12/12/91 -> 12/12/91 000379 91CA-16 -> 91CA-16 12/12/91 -> 12/12/91 000380 91CA-16 -> 91CA-16 12/12/91 -> 12/12/91 000381 91CA-16 -> 91CA-16 12/12/91 -> 13/12/91 000382 91CA-llA-> 91CA-11A 13/12/91 -> 13/12/91 Navigation Summary The following is a summary of lines which have poor positioning or no positioning. Any lines not mentioned below are without problems and DGPS coverage was good throughout. 91CA - 01 At approximately SP 161 S.V. #15 low elevation causing incorrect position data, ship steered to keep on line. At SP 290 S.V. #15 dropped giving true position of vessel at SP 295. At SP 1942 change constellation, takes a while to find solution to position, implies navigation starts drifting until SP 1962 where recorded positions are correct. 91CA - 03 reason unknown probably 91CA - 03A changing from Cairns to SP 742 A jump of 60 metres forward, poor constellation. SP 1602 A 2 0 metre jump to port on Darwin differentials. 91CA - 04 SP 3101 A 200 metre jump forward in the line, due to instability shot control was changed to time of 9 secs, SP 3117 shot control reverted to distance. At SP 1915 a 40 metre jump to port as differential positioning changed from Darwin to Cairns. 91CA - 05 SP 505 change constellation, delay while navigation converges to a fix. SP 512 position correct. 91CA - 07 SP 1073 to SP 1178 all navigation position data incorrect due to poor satellite coverage. At SP 1535 change to bad constellation, navigation position data incorrect. SP 1579 to SP 1584 using time shot control T = 9 sec. At SP 1584 to SP 2 071 shotpoint navigation data noisy. At SP 2079 change to bad constellation, navigation data incorrect. At SP 2079 to 2090 using time shot control T = 9 sec. At SP 2144

lose navigation data. At SP 2144 to SP 2186 using time shot control T = 9 sec. xii. Navigation Summary Cont. 91CA - 10 SP 2487 change to bad constellation, navigation data incorrect. SP 2491 using time shot control T = 9 sec. SP 2531 S.V. #6 dropped. SP 2 53 5 using distance control on shots, interval = 25 m. At SP 2701 tried S.V. #6 again, navigation data incorrect. SP 2707 using time shot control T = 9 sec. SP 2721 dropped S.V. #6. SP 2731 using distance control on shots, interval = 25 m. 91CA - 11 SP 847 Lost positioning completely, SP 854 time control 9 secs, SP 875 back on distance , shot control stable. At SP 1491 general poor positioning due to a new satellite constellation. At SP 1601 lost positioning completely, SP 1602 time control of 9 secs used, SP 1620 back on distance control. At SP 1639 lost positioning completely, SP 1640 time control of 9 secs used, SP 1652 back on distance control navigation stable. At SP 1702 a jump of about 50 metres to port due to change from Darwin to Cairns. From this shotpoint poor positioning and vessel moving off line according to nav. SP 1764 lost positioning completely, SP 1767 shot control time 9 secs, SP 1817 back on distance shot control. At SP 1846 change to Darwin differentials, this produced instability and a 70 metre skew to port. SP 1856 changed back to Cairns differentials. 91CA - 12 SP 1281 change to bad constellation. Jump at SP 1281. Change from Cairns differentials to Darwin differentials at SP 1283. SP 1288 return to Cairns differentials. SP 1356 change to Darwin differentials, slight jump. SP 1489 change to Cairns differentials, slight jump. SP 2570 change to bad constellation. SP 2573 to SP 2582 using time control on shots, T = 9 sec. At SP 2759 navigation jump on constellation change. 91CA - 15 SP 4375 Navigation positioning poor until SP 4401. At SP 4648 lost positioning completely, SP 4650 shot control changed to time 9 secs. SP 4672 Positioning stable and back on distance control of 25 metres. xii. Navigation Summary Cont. 91CA - 16 SP 1047 lose navigation positioning. Use time shot control, T = 9 sec. SP 1069 change to Darwin differentials. SP 1077 return to distance shot control. SP 1305 return to Cairns differentials. SP 2900 lose navigation positioning. SP 2905 use time shot control, T = 9 sec. SP 2922 swap to Darwin differentials. SP 2942 changed shot interval to T = 8.5 sec. SP 2971 return to distance shot control. SP 3026 return to Cairns differentials. SP 3340 navigation velocities bad, change to time control, T = 9 sec; use Darwin differentials. SP 3349 return to distance shot control. SP 3371 return to Cairns differentials. SP 3645 50 metre jump forward. SP 3792 lose navigation position. SP 3798 to SP 3815 use time shot control, T = 9 sec. SP 4131 navigation starts drifting. SP 4133 swapped to Darwin differentials. SP 4149 to 4164 use time shot control, T = 9 sec. SP 4207 return to Cairns differentials. SP 4533 navigation starts drifting. SP 4547 change to Darwin differentials, navigation good. SP 4695 to EOL navigation positions drifting. i , : RENUMBER OF SHOTPOINTS FOR CARPENTARIA MARINE Q/22P SURVEY. CORDING TO THE NAVIGATION LOG, THERE ARE TWO LINES WITH SHOTPOINTS V^ED DURING SURVEY AND THEY NEED RENUMBER IN THE POST-PROCESSING. I .OWING ARE THE CHANGES MADE : GA-0 7 SHOTPOINT JUMP OCCURED IN TWO PLACES. SP 1072-1178 WHICH HAS SHOTPOINT JUMPED BY 54 AS ESTIMATED BY THE DISTANCE BETWEEN SP 1071 AND 1179. SP 1534-1584 WHICH HAS SHOTPOINT JUMPED BY 13 AS ESTIMATED BY THE DISTANCE BETWEEN SP 1533 AND 1585. -101 - 1071 101 - 1071 072 - 1178 1072 - 1124 (NEED TO TAKE OUT 54 SP IN BETWEEN) xl79 - 1533 1125 - 1479 1534 - 1584 1480 -

1517 (NEED T.0 TAKE OUT 13 SP IN BETWEEN) 585 - 4368 1518 - 4301 P IN FIELD RENUMBER SP FOR PROCESSING CA-17 SHOTPOINT JUMPED IN BETWEEN SP 662 TO SP 683 BY 11 AS ESTIMATED FROM THE DISTANCE. P IN FIELD RENUMBER SP 101 - 661 ■101 - 661 662 - - 683 662 - 672 684 - 3427 673 - 3416 FOR PROCESSING (NEED TO TAKE■ OUT 11 SP IN BETWEEN) SECTION VI OPERATIONS CR24781A VI. 1 VI. OPERATIONS Offset Calculation The offset was determined by firing a single gun (twice) from each of the two sub arrays used ie. Port Outer and Starboard Inner or Port Inner and Starboard Outer and recording the data on tape. Offset recordings are made at the beginning of every line and may be found on the first tape of each recorded line. The offset gun chosen from each sub array was located at the centre of the gun string. These were gun #9 on the port outer string, gun #25 on the port inner string, gun #41 on the starboard inner string and gun #57 on the starboard outer string. The gun numbers and record numbers were recorded on the observers log. The onset time (t) of the first break of each of the four shots to the near trace of each streamer was determined from the offset program resident in the Titan 1000 software. The program simply determines the onset time in milliseconds of the first arrivals at a nominated trace. The hard copy printouts of the offset analysis software were kept with the single fold plots and shipped to the processing centre. The distance from the centre of the gun array to the centre of the near trace was computed by subtracting a gun delay of 51.2 milliseconds from the average onset time, then multiplying this by the water sound velocity of 1.5 metres/millisecond. Half the group interval was then added to determine the distance to the centre of the group. An example of one of the four offset calculations is shown as follows:- OFFSET = [ (t - gun delay) x (water velocity/1000)] + (group interval/2) = [(100 - 51.2) X 1.5] + 6.25 = 79.45 metres Each of the four offset measurements was evaluated in this way and the results were recorded on the observer's logs. Operations Discussion The weather conditions and sea state were favourable throughout the survey period. During data acquisition on line 91CU-02 the source volume was reduced by half to 1090 cubic inches at the Clients request to evaluate the effect on data quality and resolution. In the Clients opinion no reduction in quality was apparent and the remainder of the survey was completed utilising this source volume. This assisted in reducing reverberations which were evident on the streamer during the majority of the lines in this survey. Line 91CA-10 had the preplotted co-ordinates changed to prevent any incident occurring at an area of shallow water over which the preplotted coordinates transversed. The new co-ordinates supplied, tied both an onshore surveyed line with a previously surveyed offshore line. This eliminated any need for the vessel to enter any shallow water area thus preventing any actual incident occurring and on data acquisition indicated to the Client that no detrimental loss of data occurred. Apart from the previously mentioned minor navigation problems, there were no other interruptions to the survey. VI. 3 Digital Streamer Discussion Throughout the Q/22P 2-D survey one stretch section, 100 metres in length, was incorporated between the lead-in and the last active section of each streamer. A tail-end stretch was incorporated after the first active section with approximately 150 metres of rope to reduce tailbuoy induced noise bursts. The streamer was ballasted for neutral buoyancy with the depths maintained by the use of Digicourse models 396/02 and 5011 Series compass birds. Streamer depths were constantly monitored throughout the survey.

Depth transducers were located in every SEM and Digicourse bird. Bird depths were displayed on the operator's STS terminal, recorded on the observer's log, ADL and magnetic tape. These depths were the primary depths used to control the trim of the streamer. VI. 4 Recording Instruments Discussion In general the instruments functioned well throughout the survey. VI. 5 Instrument Tests The recording instruments operated within contractual specifications with few problems being encountered for the duration of the survey. SEM tests were carried out on a daily and monthly basis throughout the survey to ensure that the instruments were operating satisfactorily. The Daily Instrument tests consisted of:~ -Converter Dynamic Range Determination (set of two) -Amplifier Harmonic Distortion Test (set of two) -Equivalent Input Noise (set of two) -General Purpose Noise/DC Offset Test The Monthly Instrument Tests consisted of:- -Converter Dynamic Range Determination (set of nine) -Amplifier Harmonic Distortion (set of four) -Equivalent Input Noise Test (set of two) -Filter Pulse Test -Crossfeed Check (odds and evens) The analyses were performed in the FCS and the results checked against the set specifications. Hard copies of the results were made available at all times to the Client Representative on board. VI. 6 Statistics First Recording Day 4 December 1991 Last Recording Day 13 December 1991 Number of Processable Lines Shot 18 Number of Chargeable Kilometres 1645.525 Number of Chargeable Shotpoints 65821 Average Chargeable Kilometres per Recording Day 164.55 VI. 7 vii. Shipment Details Seismic Data Shipments Shipment No Date 2840-007-SYD-91 13-12-91 Seismic data shipped to :~ Attn: John Thornton Halliburton Geophysical Services, Inc. 6-10 Talavera Road North Ryde N.S.W. 2113 Navigation Data Shipments Date 13-12-1991 Shipment No 2840-015-SIN-91 Navigation data shipped to :- Attn: Tan Eng Teck Navigation Processing Halliburton Geophysical Services Far East Pty Ltd #08-23 Lam Soon Industrial Building 63 Hillview Ave SINGAPORE 2366 APPENDIX A LINE SUMMARY Al- LINE SUMMARY DATE LINE DIR SP RANGE RN RANGE COMMENTS 04/12/91 91CU-02 089.0 101 -1275 101 -1275 COMPLETE 91CU-01 178.9 101 -1356 101 -1356 COMPLETE 91CA-17 179.9 101 - 540 101 - 540 M.S.P. 05/12/91 91CA-17 179.9 541 -3427 541 -3416 COMPLETE 91CA-06 270.0 101 -2547 101 -2547 COMPLETE 91CA-08 090.1 101 -2540 101 -2540 COMPLETE 06/12/91 91CA-09 270.2 D.N.P. D.N.P. D.N.P. 91CA-09A 270.2 101 -2543 101 -2541 COMPLETE 91CA-07 090.1 101 -4368 101 -4268 T.B.C. 07/12/91 91CA-10 073.2 101 -3285 101 -3278 COMPLETE 91CA-11 257.5 101 -2847 101 -2839 COMPLETE 91CA-04 269.8 101 -1800 101 -1800 M.S.P. 08/12/91 91CA-04 269.8 1801-4786 1801-4786 COMPLETE 91CA-05 089.4 101 -3755 101 -3751 COMPLETE 91CA-03 270.0 101 - 969 101 - 943 T.B.C. 09/12/91 91CA-03A 270.0 881 -3763 881 -3763 COMPLETE 91CA-02 090.1 101 -3659 101 -3659 COMPLETE 91CA-01 269.9 101 -1230 101 -1230 M.S.P. 10/12/91 91CA-01 269.9 1231-3764 1231-3764 COMPLETE 91CA-12 180.0 101 -6116 101 -6116 COMPLETE 11/12/91 91CA-14 000.2 101 -3041 101 -3038 COMPLETE 91CA-13 000.2 101 -3220 101 -3220 COMPLETE 91CA-15 180.1 101 -1410 101 -1410 M.S.P. 12/12/91 91CA-15 180.1 1411-6133 1411-6125 COMPLETE 91CA-16 000.0 101 -3850 101 -3838 M.S.P. 13/12/91 91CA-16 000.0 3851-4732 3839-4713 COMPLETE 91CA-11A 077.6 101 - 619 101 - 619 COMPLETE COMPLETION OF COMALCO CARPENTARIA O/22P 2-D SURVEY CR24781A APPENDIX B FIELD TAPE INVENTORY FIELD TAPE INVENTORY RECORDS BOX LINE NO. SP RANGE 04/12/91 06430 06431 91CU-02 91CU-02 101 - 202 203 - 309 101 -

202 203 - 309 01 06432 91CU-02 310 - 416 310 - 416 06433 91CU-02 417 - 523 417 - 523 05434 91CU-02 524 - 630 524 - 630 06435 91CU-02 631 - 737 631 - 731 06436 91CU-02 738 - 844 738 - 844 06437 91CU-02 845 - 951 845 - 951 06438 91CU-02 952 -1058 952 -1058 06439 91CU-02 1059-1165 1059-1165 06440 91CU-02 1166-1272 1166-1272 01 06441 91CU-02 1273-1275 1273-1275 06442 91CU-01 101 - 202 101 - 202 06443 91CU-01 203 - 309 203 - 309 06444 91CU-01 310 - 416 310 - 416 06445 91CU-01 417 - 523 417 - 523 06446 91CU-01 524 - 630 524 - 630 06447 91CU-01 631 - 737 631 - 737 06448 91CU-01 738 - 844 738 - 844 06449 91CU-01 845 - 951 845 - 951 06450 91CU-01 952 -1058 952 -1052 01 06451 91CU-01 1059-1165 1059-1165 06452 91CU-01 1166-1272 1166-1272 06453 91CU-01 1273-1356 1273-1356 06454 91CA-17 101 - 202 101 - 202 06455 91CA-17 203 - 309 203 - 309 06456 91CA-17 310 - 416 310 - 416 06457 91CA-17 417 - 523 417 - 523 05/12/91 06458 91CA-17 524 - 630 524 - 630 06459 91CA-17 631 - 748 631 - 737 06460 91CA-17 749 - 855 738 - 844 02 06461 91CA-17 856 - 962 845 - 951 06462 91CA-17 963 -1069 952 -1058 06463 91CA-17 1070-1176 1059-1165 06464 91CA-17 1177-1283 1166-1272 06465 91CA-17 1284-1390 1273-1379 06466 91CA-17 1391-1497 1380-1486 06467 91CA-17 1498-1604 1487-1593 06468 91CA-17 1605-1711 1594-1700 06469 91CA-17 1712-1818 1701-1807 FIELD TAPE INVENTORY DATE TAPE NO. LINE NO. SP RANGE RECORDS BOX 05/12/91 06470 06471 91CA-17 91CA-17 1819-1925 1926-2032 1808-1914 1915-2021 02 06472 91CA-17 2033-2139 2022-2128 06473 91CA-17 2140-2246 2129-2235 06474 91CA-17 2247-2353 2236-2342 06475 91CA-17 2354-2460 2343-2449 06476 91CA-17 2461-2567 2450-2556 06477 91CA-17 2568-2674 2557-2663 06478 91CA-17 2675-2781 2664-2770 06479 91CA-17 2782-2888 2771-2877 06480 91CA-17 2889-2995 2878-2984 02 06481 91CA-17 2996-3102 2985-3091 06482 91CA-17 3103-3209 3092-3198 06483 91CA-17 3210-3316 3199-3305 06484 91CA-17 3317-3423 3306-3412 06485 91CA-17 3424-3427 3413-3416 06486 91CA-06 101 - 202 101 - 202 06487 91CA-06 203 - 309 203 - 309 06488 91CA-06 310 - 416 310 - 416 06489 91CA-06 417 - 523 417 - 523 06490 91CA-06 524 - 630 524 - 630 03 06491 91CA-06 631 - 737 631 - 737 06492 91CA-06 738 - 844 738 - 844 06493 91CA-06 845 - 951 845 - 951 06494 91CA-06 952 -1058 952 -1058 06495 91CA-06 1059-1165 1059-1165 06496 91CA-06 1166-1272 1166-1272 06497 91CA-06 1273-1379 1273-1379 06498 91CA-06 1380-1486 1380-1486 06499 91CA-06 1487-1593 1487-1593 06500 91CA-06 1594-1700 1594-1700 03 06501 91CA-06 1701-1807 1701-1807 06502 91CA-06 1808-1914 1808-1914 06503 91CA-06 1915-2021 1915-2021 06504 91CA-06 2022-2128 2022-2128 06505 91CA-06 2129-2235 2129-2235 06506 91CA-06 2236-2342 2236-2342 06507 91CA-06 2343-2449 2343-2449 06508 91CA-06 2450-2547 2450-2547 06509 91CA-08 101 - 202 101 - 202 -B3- FIELD TAPE INVENTORY DATE TAPE NO. LINE NO. SP RANGE RECORDS BOX 05/12/91 06510 06511 91CA-08 91CA-08 203 - 309 310 - 416 203 - 309 310 - 416 03 06512 91CA-08 417 - 523 417 - 523 06513 91CA-08 524 - 630 524 - 630 06514 91CA-08 631 - 737 631 - 737 06515 91CA-08 738 - 844 738 - 844 06516 91CA-08 845 - 951 845 - 951 06517 91CA-08 952 -1058 952 -1058 06518 91CA-08 1059-1165 1059-1165 06519 91CA-08 1166-1272 1166-1272 06520 91CA-08 1273-1379 1273-1379 04 06521 91CA-08 1380-1486 1380-1486 06522 91CA-08 1487-1593 1487-1593 06523 91CA-08 1594-1700 1594-1700 06524 91CA-08 1701-1807 1701-1807 06525 91CA-08 1808-1914 1808-1914 06526 91CA-08

1915-2021 1915-2021 06527 91CA-08 2022-2128 2022-2128 06528 91CA-08 2129-2235 2129-2235 06529 91CA-08 2236-2342 2236-2342 06530 91CA-08 2343-2449 2343-2449 04 06531 91CA-08 2450-2540 2450-2540 06/12/91 06532 91CA-09 D.N.P. D.N.P. 06533 91CA-09 D.N.P. D.N.P. 06534 91CA-09A 101 - 202 101 - 202 06535 91CA-09A 203 - 309 203 - 309 06536 91CA-09A 310 - 416 310 - 416 06537 91CA-09A 417 - 525 417 - 523 06538 91CA-09A 526 - 632 524 - 630 06539 91CA-09A 633 - 739 631 - 737 06540 91CA-09A 740 - 846 738 - 844 04 06541 91CA-09A 847 - 953 845 - 951 06542 91CA-09A 954 -1060 952 -1058 06543 91CA-09A 1061-1167 1059-1165 06544 91CA-09A 1168-1274 1166-1272 06545 91CA-09A 1275-1381 1273-1379 06546 91CA-09A 1382-1488 1380-1486 06547 91CA-09A 1489-1595 1487-1593 06548 91CA-09A 1596-1702 1594-1700 06549 91CA-09A 1703-1809 1701-1807 FIELD TAPE INVENTORY DATE TAPE NO. LINE NO. SP RANGE RECORDS BOX 06/12/91 06550 06551 91CA-09A 91CA-09A 1810-1916 1917-2023 1808-1914 1915-2021 05 06552 91CA-09A 2024-2130 2022-2128 06553 91CA-09A 2131-2237 2129-2235 06554 91CA-09A 2238-2344 2236-2342 06555 91CA-09A 2345-2451 2343-2449 06556 91CA-09A 2452-2543 2450-2541 06557 91CA-07 101 - 202 101 - 202 06558 91CA-07 203 - 309 203 - 309 06559 91CA-07 310 - 416 310 - 416 06560 91CA-07 417 - 523 417 - 523 05 06561 91CA-07 524 - 630 524 - 630 06562 91CA-07 631 - 737 631 - 737 06563 91CA-07 738 - 844 738 - 844 06564 91CA-07 845 - 951 845 - 951 06565 91CA-07 952 -1058 952 -1058 06566 91CA-07 1059-1237 1059-1165 06567 91CA-07 1238-1344 1166-1272 06568 91CA-07 1345-1451 1273-1379 06569 91CA-07 1452-1577 1380-1486 06570 91CA-07 1578-1684 1487-1593 05 06571 91CA-07 1685-1791 1594-1700 06572 91CA-07 1792-1900 1701-1807 06573 91CA-07 1901-2007 1808-1914 06574 91CA-07 2008-2119 1915-2021 06575 91CA-07 2120-2226 2022-2128 06576 91CA-07 2227-2333 2129-2235 06577 91CA-07 2334-2442 2236-2342 06578 91CA-07 2443-2549 2343-2449 06579 91CA-07 2550-2656 2450-2556 06580 91CA-07 2657-2763 2557-2663 06 06581 91CA-07 2764-2870 2664-2770 06582 91CA-07 2871-2977 2771-2877 06583 91CA-07 2978-3084 2878-2984 06584 91CA-07 3085-3191 2985-3091 06585 91CA-07 3192-3298 3092-3198 06586 91CA-07 3299-3405 3199-3305 06587 91CA-07 3406-3512 3306-3412 06588 91CA-07 3513-3619 3413-3519 06589 91CA-07 3620-3726 3520-3626 -B5- FIELD TAPE INVENTORY DATE TAPE NO. LINE NO. SP RANGE RECORDS BOX 06/12/91 06590 91CA-07 3727-3833 3627-3733 06 06591 91CA-07 3834-3940 3734-3840 06592 91CA-07 3941-4047 3841-3947 06593 91CA-07 4048-4154 3948-4054 06594 91CA-07 4155-4261 4055-4161 06595 91CA-07 4262-4368 4162-4268 06596 91CA-07 4369-4369 4269-4269 07/12/91 06597 91CA-10 101 - 206 101 - 206 06598 91CA-10 207 - 313 207 - 313 06599 91CA-10 314 - 420 314 - 420 06600 91CA-10 421 - 527 421 - 527 06 06601 91CA-10 528 - 634 528 - 634 06602 91CA-10 635 - 741 635 - 741 06603 91CA-10 742 - 847 742 - 847 06604 91CA-10 848 - 954 848 - 954 06605 91CA-10 955 -1062 955 -1062 06606 91CA-10 1063-1169 1063-1169 06607 91CA-10 1170-1276 1170-1276 06608 91CA-10 1277-1383 1277-1383 06609 91CA-10 1384-1490 1384-1490 06610 91CA-10 1491-1597 1491-1597 07 06611 91CA-10 1598-1704 1598-1704 06612 91CA-10 1705-1811 1705-1811 06613 91CA-10 1812-1918 1812-1918 06614 91CA-10 1919-2025 1919-2025 06615 91CA-10 2026-2132 2026-2132 06616 91CA-10 2133-2239 2133-2239 06617 91CA-10 2240-2346 2240-2346 06618 91CA-10 2347-2453 2347-2453 06619 91CA-10 2454-2560 2454-2560

06620 91CA-10 2561-2667 2561-2667 07 06621 91CA-10 2668-2781 2668-2774 06622 91CA-10 2782-2888 2775-2881 06623 91CA-10 2889-2995 2882-2988 06624 91CA-10 2996-3102 2989-3095 06625 91CA-10 3103-3209 3096-3202 06626 91CA-10 3210-3285 3203-3278 06627 91CA-11 101 - 202 101 - 202 06628 91CA-11 203 - 309 203 - 309 06629 91CA-11 310 - 416 310 - 416 FIELD TAPE INVENTORY DATE TAPE NO. LINE NO. . SP RANGE RECORDS BOX 07/12/91 06630 91CA-11 417 - 523 417 - 523 07 06631 91CA-11 524 - 630 524 - 630 06632 91CA-11 631 - 737 631 - 737 06633 91CA-11 738 - 844 738 - 844 06634 91CA-11 845 - 955 845 - 951 06635 91CA-11 956 -1062 951 -1058 06636 91CA-11 1063-1169 1059-1165 06637 91CA-11 1170-1276 1166-1272 06638 91CA-11 1277-1383 1273-1379 06639 91CA-11 1384-1490 1380-1486 06640 91CA-11 1491-1599 1487-1593 08 06641 91CA-11 1600-1706 1594-1700 06642 91CA-11 1707-1814 1701-1807 06643 91CA-11 1815-1922 1808-1914 06644 91CA-11 1923-2029 1915-2021 06645 91CA-11 2030-2136 2022-2128 06646 91CA-11 2137-2243 2129-2235 06647 91CA-11 2244-2350 2236-2342 06648 91CA-11 2351-2457 2343-2449 06649 91CA-11 2458-2564 2450-2556 06650 91CA-11 2565-2671 2557-2663 08 06651 91CA-11 2672-2778 2664-2770 06652 91CA-11 2779-2847 2771-2839 06653 91CA-04 101 - 202 101 - 202 06654 91CA-04 203 - 309 203 - 309 06655 91CA-04 310 - 416 310 - 416 06656 91CA-04 417 - 523 417 - 523 06657 91CA-04 524 - 630 524 - 630 06658 91CA-04 631 - 737 737 - 737 06659 91CA-04 738 - 844 738 - 844 06660 91CA-04 845 - 951 845 - 951 08 06661 91CA-04 952 -1058 952 -1058 06662 91CA-04 1059-1165 1059-1165 06663 91CA-04 1166-1272 1166-1272 06664 91CA-04 1273-1379 1273-1379 06665 91CA-04 1380-1486 1380-1486 06666 91CA-04 1487-1593 1487-1593 06667 91CA-04 1594-1700 1594-1700 06668 91CA-04 1701-1807 1701-1807 08/12/91 06669 91CA-04 1808-1914 1808-1914 DATE FIELD TAPE INVENTORY TAPE NO. LINE NO. SP RANGE RECORDS BOX 08/12/91 06670 91CA-04 1915-2021 1915-2021 06671 91CA-04 2022-2128 2022-2128 06672 91CA-04 2129-2235 2129-2235 06673 91CA-04 2236-2342 2236-2342 06674 91CA-04 2343-2449 2343-2449 06675 91CA-04 2450-2556 2450-2556 06676 91CA-04 2557-2663 2557-2663 06677 91CA-04 2664-2770 2664-2770 06678 91CA-04 2771-2877 2771-2877 06679 91CA-04 2878-2984 2878-2984 06680 91CA-04 2985-3091 2985-3091 06681 91CA-04 3092-3198 3092-3198 06682 91CA-04 3199-3305 3199-3305 06683 91CA-04 3306-3412 3306-3412 06684 91CA-04 3413-3519 3413-3519 06685 91CA-04 3520-3626 3520-3626 06686 91CA-04 3627-3733 3627-3733 06687 91CA-04 3734-3840 3734-3840 06688 91CA-04 3841-3947 3841-3947 06689 91CA-04 3948-4054 3948-4054 06690 91CA-04 4055-4161 4055-4161 06691 91CA-04 4162-4268 4162-4268 06692 91CA-04 4269-4375 4269-4375 06693 91CA-04 4376-4482 4376-4482 06694 91CA-04 4483-4589 4483-4589 06695 91CA-04 4590-4696 4590-4696 06696 91CA-04 4697-4786 4697-4786 06697 91CA-05 101 - 202 101 - 202 06698 91CA-05 203 - 309 203 - 309 06699 91CA-05 310 - 416 310 - 416 06700 91CA-05 417 - 523 417 - 523 06701 91CA-05 524 - 630 524 - 630 06702 91CA-05 631 - 737 631 - 737 06703 91CA-05 738 - 844 738 - 844 06704 91CA-05 845 - 951 845 - 951 06705 91CA-05 952 -1058 952 -1058 06706 91CA-05 1059-1165 1059-1165 06707 91CA-05 1166-1272 1166-1272 06708 91CA-05 1273-1379 1273-1379 06709 91CA-05 1380-1486 1380-1486 09 -B8- DATE FIELD TAPE INVENTORY TAPE NO. LINE NO. SP RANGE RECORDS BOX 08/12/91 06710 06711 91CA-05 91CA-05 1487-1593 1594-1700

1487-1593 1594-1700 10 06712 91CA-05 1701-1807 1701-1807 06713 91CA-05 1808-1914 1808-1914 06714 91CA-05 1915-2021 1915-2021 06715 91CA-05 2022-2128 2022-2128 06716 91CA-05 2129-2235 2129-2235 06717 91CA-05 2236-2342 2236-2342 06718 91CA-05 2343-2449 2343-2449 06719 91CA-05 2450-2556 2450-2556 06720 91CA-05 2557-2663 2557-2663 10 06721 91CA-05 2664-2770 2664-2774 06722 91CA-05 2771-2877 2775-2881 06723 91CA-05 2878-2984 2882-2988 06724 91CA-05 2985-3091 2989-3095 06725 91CA-05 3092-3198 3096-3202 06726 91CA-05 3199-3305 3203-3309 06727 91CA-05 3306-3412 3310-3416 06728 91CA-05 3413-3519 3417-3523 06729 91CA-05 3520-3626 3524-3630 06730 91CA-05 3627-3733 3631-3737 11 06731 91CA-05 3734-3751 3738-3755 06732 91CA-03 101 - 202 101 - 202 06733 91CA-03 203 - 309 203 - 309 06734 91CA-03 310 - 416 310 - 416 06735 91CA-03 417 - 523 417 - 523 06736 91CA-03 524 - 630 524 - 630 06737 91CA-03 631 - 737 631 - 737 06738 91CA-03 738 - 844 738 - 844 06739 91CA-03 845 - 958 845 - 951 09/12/91 06740 91CA-03A 881 - 982 881 - 982 11 06741 91CA-03A 983 -1089 983 -1089 06742 91CA-03A 1090-1196 1090-1196 06743 91CA-03A 1197-1303 1197-1303 06744 91CA-03A 1304-1410 1304-1410 06745 91CA-03A 1411-1517 1411-1517 06746 91CA-03A 1518-1624 1518-1624 06747 91CA-03A 1625-1731 1625-1731 06748 91CA-03A 1732-1838 1732-1838 06749 91CA-03A 1839-1945 1839-1945 DATE FIELD TAPE INVENTORY TAPE NO. LINE NO. SP RANGE RECORDS BOX 09/12/91 06750 91CA-03A 1946-2052 1946-2052 06751 91CA-03A 2053-2159 2053-2159 06752 91CA-03A 2160-2266 2160-2266 06753 91CA-03A 2267-2373 2267-2373 06754 91CA-03A 2374-2480 2374-2480 06755 91CA-03A 2481-2587 2481-2587 06756 91CA-03A 2588-2694 2588-2694 06757 91CA-03A 2695-2801 2695-2801 06758 91CA-03A 2802-2908 2802-2908 06759 91CA-03A 2909-3015 2909-3015 06760 91CA-03A 3016-3122 3016-3122 06761 91CA-03A 3123-3229 3123-3229 06762 91CA-03A 3230-3336 3230-3336 06763 91CA-03A 3337-3443 3337-3443 06764 91CA-03A 3444-3550 3444-3550 06765 91CA-03A 3551-3657 3551-3657 06766 91CA-03A 3658-3763 3658-3763 06767 91CA-02 101 - 202 101 - 202 06768 91CA-02 203 - 309 203 - 309 06769 91CA-02 310 - 416 310 - 416 06770 91CA-02 417 - 523 417 - 523 06771 91CA-02 524 - 630 524 - 630 06772 91CA-02 631 - 737 631 - 737 06773 91CA-02 738 - 844 738 - 844 06774 91CA-02 845 - 951 845 - 951 06775 91CA-02 952 -1058 952 -1058 06776 91CA-02 1059-1165 1059-1165 06777 91CA-02 1166-1272 1166-1272 06778 91CA-02 1273-1379 1273-1379 06779 91CA-02 1380-1486 1380-1486 06780 91CA-02 1487-1593 1487-1593 06781 91CA-02 1594-1700 1594-1700 06782 91CA-02 1701-1807 1701-1807 06783 91CA-02 1808-1914 1808-1914 06784 91CA-02 1915-2021 1915-2021 06785 91CA-02 2022-2128 2022-2128 06786 91CA-02 2129-2235 2129-2235 06787 91CA-02 2236-2342 2236-2342 06788 91CA-02 2343-2449 2343-2449 06789 91CA-02 2450-2556 2450-2556 12 12 DATE -BIO- FIELD TAPE INVENTORY TAPE NO. LINE NO. SP RANGE RECORDS BOX 09/12/91 06790 91CA-02 2557-2663 2557-2663 06791 91CA-02 2664-2770 2664-2770 06792 91CA-02 2771-2877 2771-2877 06793 91CA-02 2878-2984 2878-2984 06794 91CA-02 2985-3091 2985-3091 06795 91CA-02 3092-3198 3092-3198 06796 91CA-02 3199-3305 3199-3305 06797 91CA-02 3306-3412 3306-3412 06798 91CA-02 3413-3519 3413-3519 06799 91CA-02 3520-3626 3520-3626 06800 91CA-02 3627-3773 3627-3733 06801 91CA-02 3774-3759 3774-3759 06802 91CA-01 101 - 202 101 - 202 06803 91CA-01 203 -

309 203 - 309 06804 91CA-01 310 - 416 310 - 416 06805 91CA-01 417 - 523 417 - 523 06806 91CA-01 524 - 630 524 - 630 06807 91CA-01 631 - 737 631 - 737 06808 91CA-01 738 - 844 738 - 844 06809 91CA-01 845 - 951 845 - 951 06810 91CA-01 952 -1058 952 -1058 06811 91CA-01 1059-1165 1059-1165 06812 91CA-01 1166-1272 1166-1272 06813 91CA-01 1273-1379 1273-1379 06814 91CA-01 1380-1486 1380-1486 06815 91CA-01 1487-1593 1487-1593 06816 91CA-01 1594-1700 1594-1700 06817 91CA-01 1701-1807 1701-1807 06818 91CA-01 1808-1914 1808-1914 06819 91CA-01 1915-2021 1915-2021 06820 91CA-01 2022-2128 2022-2128 06821 91CA-01 2129-2235 2129-2235 06822 91CA-01 2236-2342 2236-2342 06823 91CA-01 2343-2449 2343-2449 06824 91CA-01 2450-2556 2450-2556 06825 91CA-01 2557-2663 2557-2663 06826 91CA-01 2664-2770 2664-2770 06827 91CA-01 2771-2877 2771-2877 06828 91CA-01 2878-2984 2878-2984 06829 91CA-01 2985-3091 2985-3091 13 DATE FIELD TAPE INVENTORY TAPE NO. LINE NO. SP RANGE RECORDS BOX 10/12/91 06830 06831 91CA-01 91CA-01 3092-3198 3199-3305 3092-3198 3199-3305 14 06832 91CA-01 3306-3412 3306-3412 06833 91CA-01 3413-3519 3413-3519 06834 91CA-01 3520-3626 3520-3626 06835 91CA-01 3627-3733 3627-3733 06836 91CA-01 3734-3764 3734-3764 06837 91CA-12 101 - 202 101 - 202 06838 91CA-12 203 - 309 203 - 309 06839 91CA-12 310 - 416 310 - 416 06840 91CA-12 417 - 523 417 - 523 14 06841 91CA-12 524 - 630 524 - 630 06842 91CA-12 631 - 737 631 - 737 06843 91CA-12 738 - 844 738 - 844 06844 91CA-12 845 - 951 845 - 951 06845 91CA-12 952 -1058 952 -1058 06846 91CA-12 1059-1165 1059-1165 06847 91CA-12 1166-1272 1166-1272 06848 91CA-12 1273-1379 1273-1379 06849 91CA-12 1380-1486 1380-1486 06850 91CA-12 1487-1593 1487-1593 15 06851 91CA-12 1594-1700 1594-1700 06852 91CA-12 1701-1807 1701-1807 06853 91CA-12 1808-1914 1808-1914 06854 91CA-12 1915-2021 1915-2021 06855 91CA-12 2022-2128 2022-2128 06856 91CA-12 2129-2235 2129-2235 06857 91CA-12 2236-2342 2236-2342 06858 91CA-12 2343-2449 2343-2449 06859 91CA-12 2450-2556 2450-2556 06860 91CA-12 2557-2666 2557-2663 15 06861 91CA-12 2667-2773 2664-2770 06862 91CA-12 2774-2880 2771-2877 06863 91CA-12 2881-2987 2878-2984 06864 91CA-12 2988-3094 2985-3091 06865 91CA-12 3095-3201 3092-3198 06866 91CA-12 3202-3308 3199-3305 06867 91CA-12 3309-3415 3306-3412 06868 91CA-12 3416-3522 3413-3519 06869 91CA-12 3523-3629 3520-3626 -B12- FIELD TAPE INVENTORY DATE TAPE NO. LINE NO. SP RANGE RECORDS BOX 10/12/91 06870 91CA-12 3630-3736 3627-3733 15 06871 91CA-12 3737-3843 3734-3840 06872 91CA-12 3844-3950 3841-3947 06873 91CA-12 3951-4057 3948-4054 06874 91CA-12 4058-4164 4055-4161 06875 91CA-12 4165-4271 4162-4268 06876 91CA-12 4272-4378 4269-4375 06877 91CA-12 4379-4485 4376-4482 06878 91CA-12 4486-4592 4483-4589 06879 91CA-12 4593-4699 4590-4696 06880 91CA-12 4700-4806 4697-4803 16 06881 91CA-12 4807-4913 4804-4910 06882 91CA-12 4914-5020 4911-5017 06883 91CA-12 5021-5127 5018-5124 06884 91CA-12 5128-5234 5125-5231 06885 91CA-12 5235-5341 5232-5338 06886 91CA-12 5342-5448 5339-5445 06887 91CA-12 5449-5555 5446-5552 06888 91CA-12 5556-5662 5553-5659 06889 91CA-12 5663-5769 5660-5766 06890 91CA-12 5770-5876 5767-5873 16 06891 91CA-12 5877-5983 5874-5980 06892 91CA-12 5984-6090 5981-6087 06893 91CA-12 6091-6116 6088-6113 11/12/91 06894 91CA-14 101 - 202 101 - 202 06895 91CA-14 203 - 309 203 - 309 06896 91CA-14 310 - 416 310 - 416

06897 91CA-14 417 - 440 417 - 440 06898 91CA-14 444 - 550 441 - 547 06899 91CA-14 551 - 657 548 - 654 06900 91CA-14 658 - 764 655 - 761 16 06901 91CA-14 765 - 871 762 - 868 06902 91CA-14 872 - 978 869 - 975 06903 91CA-14 979 -1085 976 -1082 06904 91CA-14 1086-1192 1083-1189 06905 91CA-14 1193-1299 1190-1296 06906 91CA-14 1300-1406 1297-1403 06907 91CA-14 1407-1513 1404-1510 06908 91CA-14 1514-1620 1511-1617 06909 91CA-14 1621-1727 1618-1724 FIELD TAPE INVENTORY DATE TAPE NO. LINE NO. SP RANGE RECORDS BOX 11/12/91 06910 91CA-14 1728-1834 1725-1831 17 06911 91CA-14 1835-1941 1832-1938 06912 91CA-14 1942-2048 1939-2045 06913 91CA-14 2049-2155 2046-2152 06914 91CA-14 2156-2262 2153-2259 06915 91CA-14 2263-2369 2260-2366 06916 91CA-14 2370-2476 2367-2473 06917 91CA-14 2477-2583 2474-2580 06918 91CA-14 2584-2690 2581-2687 06919 91CA-14 2691-2797 2688-2794 06920 91CA-14 2798-2904 2795-2901 17 06921 91CA-14 2905-3011 2902-3008 06922 91CA-14 3012-3041 3009-3038 06923 91CA-13 101 - 202 101 - 202 06924 91CA-13 203 - 309 203 - 309 06925 91CA-13 310 - 416 310 - 416 06926 91CA-13 417 - 523 417 - 523 06927 91CA-13 524 - 630 524 - 630 06928 91CA-13 631 - 737 631 - 737 06929 91CA-13 738 - 844 738 - 844 06930 91CA-13 845 - 951 845 - 951 17 06931 91CA-13 952 -1058 952 -1058 06932 91CA-13 1059-1165 1059-1165 06933 91CA-13 1166-1272 1166-1272 06934 91CA-13 1273-1379 1273-1379 06935 91CA-13 1380-1486 1380-1486 06936 91CA-13 1487-1593 1487-1593 06937 91CA-13 1594-1700 1594-1700 06938 91CA-13 1701-1807 1701-1807 06939 91CA-13 1808-1914 1808-1914 06940 91CA-13 1915-2021 1915-2021 18 06941 91CA-13 2022-2043 2022-2043 06942 91CA-13 2044-2150 2044-2150 06943 91CA-13 2151-2257 2151-2257 06944 91CA-13 2258-2364 2258-2364 06945 91CA-13 2365-2471 2365-2471 06946 91CA-13 2472-2578 2472-2578 06947 91CA-13 2579-2685 2579-2685 06948 91CA-13 2686-2792 2686-2792 06949 91CA-13 2793-2899 2793-2899 FIELD TAPE INVENTORY DATE TAPE NO. LINE NO. SP RANGE RECORDS BOX 11/12/91 06950 06951 91CA-13 91CA-13 2900-3006 3007-3113 2900-3006 3007-3113 18 06952 91CA-13 3114-3220 3114-3220 06953 91CA-13 D.N.P. D.N.P. 06954 91CA-15 101 - 202 101 - 202 06955 91CA-15 203 - 309 203 - 309 06956 91CA-15 310 - 416 310 - 416 06957 91CA-15 417 - 523 417 - 523 06958 91CA-15 524 - 630 524 - 630 06959 91CA-15 631 - 737 631 - 737 06960 91CA-15 738 - 844 738 - 844 06961 91CA-15 845 - 951 845 - 951 06962 91CA-15 952 -1058 952 -1058 06963 91CA-15 1059-1165 1059-1165 06964 91CA-15 1166-1272 1166-1272 06965 91CA-15 1273-1379 1273-1379 06966 91CA-15 1380-1486 1380-1486 06967 91CA-15 1487-1593 1487-1593 06968 91CA-15 1594-1700 1594-1700 06969 91CA-15 1701-1807 1701-1807 06970 91CA-15 1808-1914 1808-1914 19 06971 91CA-15 1915-2021 1915-2021 06972 91CA-15 2022-2128 2022-2128 06973 91CA-15 2129-2235 2129-2235 06974 91CA-15 2236-2342 2236-2342 06975 91CA-15 2343-2449 2343-2449 06976 91CA-15 2450-2556 2450-2556 06977 91CA-15 2557-2663 2557-2663 06978 91CA-15 2664-2770 2664-2770 06979 91CA-15 2771-2877 2771-2877 06980 91CA-15 2878-2984 2878-2984 19 06981 91CA-15 2985-3091 2985-3091 06982 91CA-15 3092-3198 3092-3198 06983 91CA-15 3199-3305 3199-3305 06984 91CA-15 3306-3412 3306-3412 06985 91CA-15 3413-3519 3413-3519 06986 91CA-15 3520-3626 3520-3626 06987 91CA-15 3627-3733 3627-3733 06988 91CA-15 3734-3840 3734-3840 06989 91CA-15 3841-3947 3841-3947 DATE -B15- FIELD TAPE INVENTORY TAPE NO.

LINE NO. SP RANGE RECORDS BOX 12/12/91 06990 91CA-15 3948-4054 3948-4054 06991 91CA-15 4055-4161 4055-4161 06992 91CA-15 4162-4268 4162-4268 06993 91CA-15 4269-4375 4269-4375 06994 91CA-15 4376-4482 4376-4482 06995 91CA-15 4483-4589 4483-4589 06996 91CA-15 4590-4704 4590-4696 06997 91CA-15 4705-4811 4697-4803 06998 91CA-15 4812-4918 4804-4910 06999 91CA-15 4919-5025 4911-5017 07000 91CA-15 5026-5132 5018-5124 07001 91CA-15 5133-5239 5125-5231 07002 91CA-15 5240-5346 5232-5238 07003 91CA-15 5347-5453 5239-5445 07004 91CA-15 5454-5496 5446-5488 07005 91CA-15 5497-5603 5489-5595 07006 91CA-15 5604-5710 5596-5702 07007 91CA-15 5711-5817 5703-5809 07008 91CA-15 5818-5924 5810-5916 07009 91CA-15 5925-6031 5917-6023 07010 91CA-15 6032-6133 6024-6125 07011 91CA-16 101 - 202 101 - 202 07012 91CA-16 203 - 309 203 - 309 07013 91CA-16 310 - 416 310 - 416 07014 91CA-16 417 - 523 417 - 523 07015 91CA-16 524 - 630 524 - 630 07016 91CA-16 631 - 737 631 - 737 07017 91CA-16 738 - 844 738 - 844 07018 91CA-16 845 - 951 845 - 951 07019 91CA-16 952 -1058 952 -1058 07020 91CA-16 1059-1165 1059-1165 07021 91CA-16 1166-1272 1166-1272 07022 91CA-16 1273-1379 1273-1379 07023 91CA-16 1380-1486 1380-1486 07024 91CA-16 1487-1593 1487-1593 07025 91CA-16 1594-1700 1594-1700 07026 91CA-16 1701-1807 1701-1807 07027 91CA-16 1808-1914 1808-1914 07028 91CA-16 1915-2021 1915-2021 07029 91CA-16 2022-2128 2022-2128 19 20 -B16- DATE 12/12/91 FIELD TAPE INVENTORY TAPE NO. LINE NO. SP RANGE RECORDS BOX 07030 91CA-16 2129-2235 2129-2235 07031 91CA-16 2236-2342 2236-2342 07032 91CA-16 2343-2449 2343-2449 07033 91CA-16 2450-2556 2450-2556 07034 91CA-16 2557-2663 2557-2663 07035 91CA-16 2664-2770 2664-2770 07036 91CA-16 2771-2877 2771-2877 07037 91CA-16 2878-2993 2878-2984 07038 91CA-16 2994-3100 2985-3091 07039 91CA-16 3101-3207 3092-3198 07040 91CA-16 3208-3314 3199-3305 07041 91CA-16 3315-3421 3306-3412 07042 91CA-16 3422-3528 3413-3519 07043 91CA-16 3529-3635 3520-3626 07044 91CA-16 3636-3742 3627-3733 07045 91CA-16 3743-3852 3734-3840 07046 91CA-16 3853-3959 3841-3947 07047 91CA-16 3960-4066 3948-4054 07048 91CA-16 4067-4174 4055-4161 07049 91CA-16 4175-4281 4162-4268 07050 91CA-16 4282-4388 4269-4375 07051 91CA-16 4389-4501 4376-4482 07052 91CA-16 4502-4608 4489-4589 07053 91CA-16 4609-4715 4590-4696 07054 91CA-16 4716-4732 4697-4713 07055 91CA-11A 101 - 202 101 - 202 07056 91CA-11A 203 - 309 203 - 309 07057 91CA-11A 310 - 416 310 - 416 07058 91CA-11A 417 - 523 417 - 523 07059 91CA-11A 524 - 619 524 - 619 COMPLETION OF COMALCO CARPENTARIA O/22P 2D SURVEY APPENDIX C LINE STATUS LOG -Cl- LINE STATUS LOG DATE LINE NO. DIR SP RANGE PROCESS SP RANGE CHARGEABLE SP RANGE CHG KMS COMMENTS 04/12/91 91CU-01 178.9 101 -1356 101 -1356 101 -1356 31.400 COMPLETE 04/12/91 91CU-02 089.0 101 -1275 101 -1275 101 -1275 29.375 COMPLETE 09/12/91 91CA-01 269.9 101 -3764 101 -3764 101 -3764 91.600 COMPLETE 09/12/91 91CA-02 090.1 101 -3759 101 -3759 101 -3759 91.475 COMPLETE 08/12/91 91CA-03 270.0 101 - 969 101 - 943 101 - 943 21.075 T.B.C. 09/12/91 91CA-03A 270.0 881 -3763 881 -3763 944 -3763 70.500 COMPLETE 07/12/91 91CA-04 269.8 101 -4786 101 -4786 101 -4786 117.150 COMPLETE 08/12/91 91CA-05 089.4 101 -3755 101 -3755 101 -3755 91.375 COMPLETE 05/12/91 91CA-06 270.0 101 -2547 101 -2547 101 -2547 61.175 COMPLETE 06/12/91 91CA-07

090.1 101 -2847 101 -2847 101 -2847 68.675 COMPLETE 05/12/91 91CA-08 090.1 101 -2540 101 -2540 101 -2540 61.000 COMPLETE 06/12/91 91CA-09 270.2 101 - 299 D.N.P. 06/12/91 91CA-09A 270.2 101 -2543 101 -2543 101 -2543 61.075 COMPLETE 07/12/91 91CA-10 090.1 101 -3285 101 -3285 101 -3285 79.625 COMPLETE 07/12/91 91CA-11 257.5 101 -4368 101 -4368 101 -4323 105.575 T.B.C. 13/12/91 91CA-11A 077.6 101 - 619 101 - 619 111 - 509 12.725 COMPLETE 10/12/91 91CA-12 180.0 101 -6116 101 -6116 101 -6116 150.400 COMPLETE 11/12/91 91CA-13 000.2 101 -3220 101 -3220 101 -3220 78.000 COMPLETE 11/12/91 91CA-14 000.2 101 -3041 101 -3041 101 -3041 73.525 COMPLETE 12/12/91 91CA-15 180.1 101 -6133 101 -6133 101 -6133 150.825 COMPLETE 12/12/91 91CA-16 000.0 101 -4732 101 -4732 101 -4732 115.800 COMPLETE 04/12/91 91CA-17 179.9 101 -3427 101 -3427 101 -3427 83.175 COMPLETE COMPLETION OF COMALCO CARPENTARIA O/22P 2D SURVEY CR24781A APPENDIX D NAVIGATION FIELD REPORT FIELD REPORT RACAL SURVEY DGPS POSITIONING FOR HALLIBURTON GEOPHYSICAL SERVICES, INC. VESSEL - M/V "MAGNIFICENT CREEK" DGPS PROVISION FOR HGS The Comalco seismic survey was carried out by HGS from the 1st to the 14th of December 1991 utilising the seismic vessel Magnificent Creek. Racal Survey provided a Differential GPS navigation system with 100% backup. The raw navigation data was output from the DNAVN computer (Compaq 386) directly to the ships CMS navigational control system. Racal Survey provided an operator to install and run the system during the seismic survey. The equipment was mobilised from Perth to be installed on the ship in Darwin and demobilised at Weipa on completion of the seismic survey. The Inmarsat receiving radomes were left on the ship for demobilising in Darwin due to transport problems from Weipa. The DGPS installation was set up to receive differential corrections from both Cairns (750 kilometres) and Darwin (1,000 kilometres) to allow for constant coverage in the work area from satellites available during periods of minimum sats in view. The seismic was carried out on a 24 hour day basis with DGPS navigation data being available from one station or the other. Darwin corrections were used only at times when Cairns had two satellites in view on waiting lock on the third as it approached a useable elevation. Prior to departure from Darwin a system check was carried out alongside the wharf. A previously surveyed bollards position was offset to the antenna position and the result agreed within 2 metres. Satellite sequence files were computed each two days for the constellations used during the days production. These constellations were automatically loaded at the computed times, as the seismic lines averaged 80 kilometres long there were several changes of constellation during a line. Calculations for these satellite constellations was made for a point midway between the work area and the reference station to allow maximum coverage. Differential correction data was downloaded from the Inmarsat Pacific Ocean satellite which had an elevation of 42 degrees and an azimuth of 74 degrees from the work area. A check was made using the Indian Ocean satellite over four hours and this gave strong signals although the elevation is 5 degrees and the azimuth 273 degrees from the work area. backup corrections. The following parameters were used for the TAU DNAVN software setup during the seismic survey:- SV Averaging 0.8 Elev. Mask 10 degrees PDOP Mask 7 Sync 1 MSL Alt. Aid Offset 17.0m (Ae Height) Tolerance 10m Const. El. Mask 15 degres Cairns 201 Darwin 202 Equipment Utilisation:- System 1 System 2 Compaq computer 0167 0252 Trimble

4000DL 1390 0888 4000DL Antenna 0258 0178 Skyfix Demodulator 2062 2057 Skyfix ACU 152 176 Skyfix Radome 017 007 Standard cable lengths ran between the GPS antenna on the -D2- DGPS OPERATION The operational DGPS system and a backup system were run continuously to provide 24 hour navigation for the seismic survey. Primary differential corrections were provided by the Cairns station and the Darwin station provided the secondary navigation mast and the Radomes on the helicopter deck. Gyro input was provided from the ships Sperry Mk 27 Gyrocompass from two available stepper outputs to the Skyfix antenna control units. Raw position data was taken in RTCM 104 from the Compaqs Auxcom 3 output to the UMS interface and the CMS navigation computer. Daily logs and Satellite constellation selection sheets are attached. All DGPS equipment SUMMARY OF EVENTS 29.11.91 30.11.91 1.12.91 2.12.91 3.12.91 4.12.91 5.12.91 6.12.91 7.12.91 8.12.91 9.12.91 10.12.91 11.12.91 12.12.91 Racal Survey operator S. Bradley departed Perth for Darwin. All equipment was located and checked. The radomes were inspected and tested in preparation for loading onto ship. Transport arranged for equipment to ship. Meet Mr L Williams of HGS. Standby. All equipment loaded to ship and installed. HGS crew assist installation. Check fix taken with good results. Ship sailed to work area. Enroute to work area. Ships Gyro steller output connected to radome control units. Enroute to location. At location, production begins. Selected constellations required recomputing for full coverage. Production continues, monitor DGPS and satellite constellations to provide best coverage. Production continues, 24 hour operation possible with short periods of loss of navigation on some constellation changes. Production continues. Production continues. Differential data lost for a 30 minute period, control station contacted and problem rectified. Production continues. Receivers calibrated. Production continues. Production continues, operational. Production continues. SUMMARY OF EVENTS Cont. 13.12.91 Production completed. DGPS equipment demobbed and packed. Ship to Weipa for offloading personnel and equipment. 14.12.91 S. Bradley to Cairns and Perth arriving 15.12.91. Ten boxes of equipment shipped to Perth via Australian Aircargo. DGPS NAVIGATION CHECK Date: 1 December 1991 Offset implies GPS Samples taken between using S.V.'s 03 06 12 Darwin Wharf 012 28 20.99 S 130 50 42.205 enna at: 012 28 21.501 130 50 41.981 05:18 and 05: 51 UTC E 13 . S E Reference: Bollard 12 28 21.52 S 130 50 42.01 E 12 28 21.51 S 130 50 42.01 E 12 28 21.51 S 130 50 42.01 E 12 28 21.50 S 130 50 42.00 E 12 28 21.50 S 130 50 41.99 E 12 28 21.50 S 130 50 41.97 E 12 28 21.49 S 130 50 41.96 E 12 28 21.49 S 130 50 41.96 E 12 28 21.48 S 130 50 41.96 E 12 28 21.48 S 130 50 41.96 E 12 28 21.48 S 130 50 41.97 E 12 28 21.49 S 130 50 41.98 E 12 28 21.49 S 130 50 41.99 E 12 28 21.50 S 130 50 42.00 E 12 28 21.50 S 130 50 42.02 E 12 28 21.49 S 130 50 42.02 E 12 28 21.48 S 130 50 42.03 E 12 28 21.47 s 130 50 42.04 E 12 28 21.47 s 130 50 42.04 E 12 28 21.47 s 130 50 42.04 E 12 28 21.46 s 130 50 42.05 E 12 28 21.46 s 130 50 42.05 E 12 28 21.45 s 130 50 42.06 E 12 28 21.45 s 130 50 42.05 E 12 28 21.44 s 130 50 42.06 E 12 28 21.43 s 130 50 42.05 E 12 28 21.43 s 130 50 42.04 E 12 28 21.44 s 130 50 42.03 E 12 28 21.44 s 130 50 42.02 E 12 28 21.44 s 130 50 42.00 E 12 28 21.44 s 130 50 41.99 E 12 28 21.44 s 130 50 41.98 E LATITUDE LONGITUDE PDOP 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 1.3 DGPS NAVIGATION CHECK Cont. 12 28 21.44 S 130 50 41.99 E 12 28 21.43 S 130 50

41.99 E 12 28 21.43 S 130 50 42.00 E 12 28 21.43 S 130 50 42.00 E 12 28 21.48 S 130 50 42.00 E 12 28 21.49 S 130 50 42.01 E 12 28 21.49 S 130 50 42.02 E 12 28 21.49 S 130 50 42.02 E 12 28 21.49 S 130 50 42.04 E 12 28 21.49 S 130 50 42.05 E 12 28 21.50 S 130 50 42.04 E 12 28 21.50 S 130 50 42.04 E 12 28 21.49 S 130 50 42.03 E 12 28 21.49 S 130 50 42.03 E 12 28 21.49 S 130 50 42.04 E 12 28 21.48 S 130 50 42.03 E 12 28 21.50 S 130 50 42.02 E 12 28 21.51 S 130 50 42.01 E LATITUDE LONGITUDE PDOP 1.3 1.3 1.3 1.3 1.3 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 AVERAGE AVERAGE LATITUDE: LONGITUDE: 21.47 S 42.00 E CLIENT . . PROJECT . C SYSTEM . . *^>* rz *' PROJECT LEADER 11016 TIME NARRATIVE £ ^AOi~gy INITIAL P&&U O73SS. s4fi*jyc THq&jt/'/. Wl c-a*. . 7t> A/t£ facet-jr) rffYE) TrtAV&UObCS. To fl S’tor -nec/cj&yC, g&trttrfAH . Lt/>W<'4s /a/S/^cat An!? fiiquQr'/CZ. 2>arn&S. Loitti/^c 7b A^y/frCcr OgoQ 7i> &/L£- . Cfy&cx STpc'/A? rc^JT <Wr}PL€7$-. 71?L. Z%7ew /W) /& t^fi«=Z) gaAF T?i/e S’L'/vbAy f/t-zj ?/ 0300 teuty[Cflr/CSX. 7/ZuCJC 7& 4»V3 <2B7V7F"J*. T — 111 z?zrb jQbviserj 7 f/C-S &&P L > ia/i'luaais 3>i/e rftb Sr^T^A.DA'y. REMARKS ^-cpr/// 3 /7 /Jr A/2-^ 2 Zbrrjer z?r -2 *- ■Ci^e f ctAmp " .... -V Q SIGNED SIGNED . - . . . Z-^—: " PROJECT LEADER , CLIENT REPRESENTATIVE TIMEZONE PROJECT LEADER DATE CLIENT . PROJECT SYSTEM . TIME NARRATIVE ^PxA7>ZfTy INITIAL G&o &93b X> AXeS rf&GF £- C&€-CS<C Dinner c^/rr^r ■o^/ m yferrevL-. /P/'ZQ CfiyrrC KprJ Gr-JT? TIMEZONE REMARKS IVls. 'newy&rJ^ ■PROJECT LEADER DAILY LOG 11018 CLIENT . . . PROJECT . .^^ CC7 . . SYSTEM . . PROJECT LEADER DATE f : ,2 r:. < ?f SIGNED CLIENT REPRESENTA THE TIMEZONE . . A TIME NARRATIVE Z&/?Z7Lg/ INITIAL 0<fcx> ~7b Tyts Aro 7& C&fyJs aud Domes A/Atr/M; TO £& <9^ ^pcs/A^e^rr' oyyffoAffZD A/VD 8&rt2G /pyj’rALCGD y y/cy CagzS A zr ar /jtstauz. /Wove ae-cyc Gecc /WD j^/y ry^st-ss jEwryes Bohj-gh to jQGt-yz>eot 37 CuaS //3<j Ay&svMTATT . CA&cjt' - ACx. 7^trr 70 Ger our err /u3o &wer2 &cocac tc yrj $77^3 l& . Alt GzaC* JT 'r OTfr x3'« Ab3 y$A/syT£*y*s'/cs, /^eraoj) -jfjRTTA ^ox. xensn^ucer Q&&xse. -rt> 1 &zxyu7y> oaj oyyyyr' 76</y~ c^cac qur£> . Z777//W / ^tyyxA j OA Ah&77oi'J\ i gw forerc JA/ir 7b <~77 3- »z ?f REMARKS c&AssysztTToxx y y»A/^y)s yfty. °X-. y&yjT/ofy z./’z /E ?! ' ZO.Q? S. yotU^ /2g>' :j o' > y.2 -2oS DC AT Abs/rso*/ * P2 -Z<f ' 2/ . So s '• f3o ' _5~<2 zc/r /Cr/7K^vO» AOTyTuU it , k /2 2xP 2/. <yy r *t / j’O y.2.o<>o 11019 ■ ■CLIENT . .... . PROJECT SYSTEM . .fy&’X'*- VESSEL PROJECT LEADER DATE . . . TIME NARRATIVE INITIAL &>yloi.rft£ . A) cl. &pc//A>mgryr oy:. Gys& ro eonfaserGD. Grto ■^rGn^stc r* 6&7*i 7»/ve /Qc-tA u^xnsxr rz’ex’Ay z?7z< s.-? Qyao. s'v' ca^~7^i^/rr,or/j'. /7fe 2^ Cytea JT&P&TC ay^pip- /& #&/ /fa/ <&#/) /pc^ ? /r»cr Xi etWdtr /%&>/&.. 6 ■Xsc> &./X&A f- Icn/rp 7Z/o Aep&rtt. cn^pA’csT'p cs&pd tt> z- /tecsf , i c- ~7C Z&. TIMEZONE . . . . £ ~ REMARKS -2*>zr\S Zocsrj-ev- Zx-' DAILY LOG 11020 VESSEL PROJECT LEADER CLIENT DATE 5 '. .<?.?< PROJECT .<???*« . fe >N”' C TIMEZONE . . . ^7 SYSTEM . . TIME NARRATIVE INITIAL 7s> xLoOT770*y Z AS77a/£ S7X)*&X)££> &S7&V 3* /&tr <?3S-2 Xb/r?(H<y O'47 ??3/o/4&faS7 '72>/M£l£. 4.9X ZX- /39o/zi3<?/u.S& (78 (Xoqo 7X. 251? oLoS7 TXsAJQT) CajqrVDJt. SLo^Zi t7& /far; Ctr/ntoL. ts/j/V IS2. 007 &)6>O"7e; 0(7 Z.yo/v'S &>fy^7foMSt, '7&7’<X£<? S?/Cs7r SS 700^0 & 72X771 Wa/ £*xq (9X-a> / 1 j 1 REMARKS SIGNED . . . SIGNED . . . VESSEL DAU - YLOC 11021 Z/z; C PROJECT . CpyP.PTPP. . SYSTEM . . 5^X5'?$ DATE 4c. /a .?/ PROJECT LEADER CLIENT . . . . TIME NARRATIVE -S~ 3fi^f\bL£^ INITIAL #T Aoc^jvorJ Gca/AS ossrc So z 02. #t><; o?& ‘ /Jasir?

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S2 . <?/ 7b C/}/**/ r zr, / z- Th foW. REMARKS SIGNED . . . SIGNED . . . .' PROJECT ■LEADER ‘ CLIENT REPRESENTATIVE SYSTEM TIMEZONE GSI—709 DISC STREAMER CONTROL SYSTEM OVERALL BLOCK DIAGRAM SCS OPERATOR FCS CONTROL LINK ♦HREAMEP K -| PRIN TER P ORT BUS SEISMIC > DATA I/O RAW fitim ms POWER i AIM MANI) BUFFER PORT SYSTEM START 512K DRAM MEMORY FLTER INPUT DRIVER FIBRE OPTIC DATA OUTPUT BUSSES STREAMER POWER CONTRUl UNIT INPUT BUSSES NON-VOLAIILE MEMORY CONTROL * REPRODUCE PROCESSOR mvme SINGLEBOARD COMPUTER -< REMOTE •« > CONTROL RAW DATA 1 SEM DATA DISPLAY (DMI) PANEL I COMMAND'BUSSEr \ _ TIME BREAK ® MOT WIRE BLAST CONTROLLER < HARD DISC FLOPPY FLOPPY DISC STREAMER DATA SIMULATOR SIGNAL PROCESSOR UNIT A FILTER CONTROLLER [ POWER A MPl lFER | RSx32 _£OfiL_K 4 FC| FC2 FC3 FAT FA2 FA3 FCT FAT FC5 FA5 FILTER xRiniMEnc » OUTPUT BUS MERGE FIELD DATA -T> PORT A FILTERED ■DATA SOURCE >4 STATUS ^PROC E SSOR SEISMIC > OATA 1/C C ‘ATA PORT B SIGNAL PROCESSOR UNIT B FILTER INPUT DRIVER PATER COHTROlLER > > fSL FC2 -> FC3 -* FC4

> FC5 REPRODUCE PROCESSOR "L FILLER ARITHMETIC FA£ FA2 TAJ > FAT I > -> FAS ■ ■D TO A MOD OLE OUTPUT BUS MERGE > FIELD DATA -T> MPLX DIS- 1 MPLX DIS 2 ST TO■ EPC ST TO SA 1RIGC-ERS >CAMERA DATA - CAMERA CONTROL PLATE 1 GSI-709 FROM ►STREAMER CONTROL SYSTEM TO/FRON CMS FCS Functional Block Diagram STREAMER DEPTH SENSOR SIGNAL CONDITIONING S[REAMER OFFSET SENSOR SIGNAL CONDITIONING RELAY CONTROL POWER POWER RELAY STREAMER OFFSE HYDROPHONE DEPTH •TRANSDUCER CHANNEL INPUTS SEISMIC SIGNAL CONDITIONING <3 SSC BOARDS. * CHANNELS PER BOARD) TOADS TEST SIGNAL OSCILLATOR AND ATTENUATOR PRE-AHPL1FICATION AND FILTERING - CONTROL CONTROL OFFSET MPLXR/SOS SELECT DUALX 16 MULTIPLEXER AMPLITUDE A/D AMPLIFIERS CLHVTR SLEW RAT^ CONVERSION AMPLIFIER GAl^ zv Ji. AMP GAIN ENCODER TOADS POWER SUPPLY / INTERCONNECT MANTISSA | GAINWORD^ MULTIPLEXER / ANALOG

CONVERSION OPSEM CONTROLLER + DATALINK INTERFACE DC VOLTAGE^ MANTISSA k ANALOG DATA AND STATUS COLLECTION AND SEQUENCE CONVERSION r F GAIN WORD l • AND DCV STATUS F SEM STATUS f HOG TOR FIBER OPTICS TRANSHISSION CONTROL ——— t> k SEM COMHANDS 1> P SEN CONTROL SEM FIELD DATA Streamer ■■Electronic Module Block Diagram COMMANDS LIVE II PLATE 3 PLATE A M/V MAGNIFICENT CREEK IVI g IVI I w I I ft Immb I XI I Vig/ 1 | ft Ihmm Immm ft Xk ANTENNAE LOCATION DIAGRAM KEY ...OCAT ION OFFSET FROM CNP X(+STBD) Y(4FWD) /T-i vp - CNP 0.0m 0.0 m PRIMARY GPS ANTENNA 0.0m 0.0m 1. TRANSIT SATELLITE ANTENNA 1.0m 2.5m 2. FATHOMETER TRANSDUCER 3.2m 2.4m 3. SONAR TRANSDUCER -3.0.m 2.5 m 4. BACKUP GPS ANTENNA 0.0m - 0.9m 5. CENTRE OF STERN .0.0 m -29.8m 6, CENTRE OF SOURCE ARRAY 0.0m -96.8m 7. NEAR BCU 0.0m -232.0m NEC THE CXJMMQN NAV POINT (CNP) IS THE REFERENCE POINT FOR SHOT CONTROL. m/v MAGNIFICENT CREEK 2180 CUBIC-INCH SLEEVE GUN ARRAY STARBOARD OUTER (LENGTH = 14.0m) 16 GUNS 9 520 cu in GUN « 33 34 35 36 37 36 39 40 41 42 43 44 45 46 47 48 STARBOARD INNER ( LENGTH = 13.4 m) 16 GUNS 9 570 cu in PLATE 5 GUN # 17 10 19 20 21 22 23 24 25 26 27 28 29 M i PORT INNER (LENGTH = 13.4 m) 16 GUNS 9 570 cu in 30 31 32 PORT OUTER ( LENGTH = 14.0m) 16 GUNS 9 520 cu in PLATE 6 M/V MAGNIFICENT CREEK 2180 CU. IN. SOURCE ARRAY CONVENTIONAL TOW AIRGUN SPREAD 87m 25m 60m SOURCE ARRAYS IN USE FOR THE DURATION OF THIS SURVEY UTILISED EITHER THE PORT INNER & STBD OUTER STBD INNER & PORT OUTER OR THE FULL SOURCE ARRAY. QA LOGS INDICATE WHICH ARRAYS WERE IN USE FOR RELEVANT LINES. PLATE 7 M/V MAGNIFICENT CREEK H.G.S. 240 TRACE STREAMER 20 19 =g= :!:!:: <ZZ>= :! ^ 18 TF==<_Z>===Tf 17 13 ~~~C5!'" " " 1 "'Ci' L2 14 czj—n STRETCH SECTION L2 5 ==^;_2> L1 TAL-BUOT 1 T2=MZZ3==^ KEY 4 I tt STREAMER ELECTR0NKM90ULE (SEMI NOTES 1: TOTAL LENGTH OF A LVSEMILZ CLUSTER IS 1304 t?. GFKX.F LENGTH IS 1ZXM i THE CENTRAL HAV POINT IS THE REFERENCE POHITDN FOR ALL ANTENNAE a; bro locations and relevant ctmensct® are listed inthe appropriate SECTIONS OF THB fttJPORT PLATE 8 LOCATION OF PROSPECT

CR24781A £ PRINCE Q0039497 DATA PROCESSING REPORT CARPENTARIA Q/22P 1992 PROCESSING COMALCO ALUMINIUM LTD CONFIDENTIAL HALLIBURTON GEOPHYSICAL SERVICES 6-10 TALAVERA RD NORTH RYDE , N.S.W. 2113 CR24781A TABLE OF CONTENTS SECTION TITLE PAGE 1 INTRODUCTION 1 2 PARAMETER DETERMINATION 3 2.1 True amplitude recovery test 3 2.2 Velocity Filter Parameter tests 3 2.3 Demultiple test 4 2.4 DMO test 5 2.5 Demult/DMO v's DMO/Demult 5 2.6 DBS tests 6 2.7 Migration test 7 2.8 Filter Parameter test 7 2.9 Scaling Parameter test 8 2.10 Display Gain test 9 3 PRODUCTION PARAMETERS 10 APPENDICES A FIELD RECORDING PARAMETERS Al B LINES PROCESSED Bl C SEG-Y TAPE INVENTORY Cl SECTION 1 INTRODUCTION Geophysical Service Inc. processed 1634 kms of data for Comalco Aluminium Limited. BHP Petroleum between May through October 1990, The data was from the Gulf of Carpentaria - Q/22P. The survey was designated 91CA/CU and was made up of 20 lines. Data quality was generally good apart from random noisey traces which had to be manually editted. Data processing was performed in GSI's Sydney office. Processing was carried out on an IBM 3090 utilising TIPEX software. SECTION 2 PARAMETER DETERMINATION 2.1a) Velocity Filter Parameter Tests Line 91CA-5 Shotpoint 200 Line 91CA-10 Shotpoint 3000 Data input to test : Field Data Display : Shot Records and their corresponding F-K representations. Key parameters : Panel : 1) No velocity filtering Velocity filtering with dipbounds +7/-3 msec/trace Velocity filtering with dipbounds +8/-3.5 msec/trace Velocity filtering with dipbounds +6.6/-3 msec/trace Velocity filtering with dipbounds +12/-6 msec/trace True amplitude recovery applied to each panel. 2.1b) Velocity Filter Parameter Tests Line 91CA-10 Shots 2850 to 3285 Data input to test : Field Data Display : Stack panels with varying velocity filtering cuts. Key parameters : Panel : 1) Velocity filtering with dipbounds +7/-3 msec/trace no Designature Velocity filtering with dipbounds +7/-3 msec/trace Designature applied Velocity filtering with dipbounds +7/-7 msec/trace Designature applied 2.2a) Deconvolution before Stack test Line 91CA-10 Shots 2850 to 3285 Displays : Stack panels with varying pre-stack deconvolutions. Data input to test : Velfilt (7/-3) No Designature Key parameters : Panel 1) 2) offsets : 79 3066 m start times: 0 2250 msec end times : 3000 3000 msec No Deconvolution Whitenning Deconvolution 2 filters of 200 msec length Design window: Predictive Deconvolution 3) 2 filters of 200 msec length and 12 msec gap. Design window: offsets : 79 3066 m start times: 0 end times :3000 2250 msec 3000 msec 2.2b) Deconvolution before Stack test Line 91CA-5 Shots 101 to 540 Line 91CA-10 Shots 2850 to 3285 Data input to test : Velfilt (7/—3) / Designature applied Displays : Stack panels with deconvolution Key parameters : Panel : 1) Predictive Deconvolution 2 filters of 200 msec length and 32 msec gap Design window: offsets : 79 3066 m start times: 0 2250 msec end times : 3000 3000 msec 2.3) Demult Test Line 91CA-10 Data input to test Displays Key parameters : Panel : Shots 2850 to 3285 Line 91CA-10 Shots 2850 to 3285 Production velocity filtered data with Deconvolution Non demult stack 4 demult stack panels No demultiple applied Demultiple with a negative F-K quadrant cut of 80000 m/sec and 15% attenuation. Demultiple with a negative F-K quadrant cut of 80000 m/sec and 25% attenuation. Demultiple with a negative F-K quadrant cut of 100000 m/sec and 15% attenuation. Demultiple with a negative F-K quadrant cut of 100000 m/sec and 25% attenuation. Dip Moveout Test Data input to test Displays Key parameters Production

demult stack data Stack panels with Kirchhoff DMO applied. Dips of +/- 8.0 msec/trace applied to 60 Offset Planes Migration Test Line 91CA-9A Shots 1000 to 2400 Data input to test : Demulted stack data Displays : 3 Migrated Stack panels Key parameters : Panel : FK migration with 100% of velocities. FD migration with 100% of velocities. 45 degree algorithm Timestep : 24 msec HDT migration with 100% of velocities. Filter Parameter Test 1 Line 91CA-9A Shots 184 to 344 Data input to test Production FD Migration Displays Key parameters : Panel 16 Stack panels Filters 1) 0 5 7 12 HZ 2) 7 13 17 23 HZ 3) 12 18 27 33 HZ 4) 17 23 37 43 HZ 5) 22 28 47 53 HZ 6) 27 33 57 63 HZ 7) 32 38 67 73 HZ 8) 37 43 77 83 HZ 9) 42 48 87 93 HZ 10) 47 53 97 103 HZ 11) 52 58 107 113 HZ 12) 57 63 117 123 HZ 13) 62 68 125 125 HZ 14) 0 0 125 125 HZ 15) 77 83 125 125 HZ 16) 82 88 125 125 HZ 2.7) Scaling Parameter Test Line 91CA-9A Shots 184 to 344 Data input to test : Production FD Migration Displays 9 Stack panels Key parameters : Panel Filter applied before scaling Scalers reference water bottom no scaling 250 FLATTVS msec gates 500 FLATTVS msec gates 750 FLATTVS msec gates 1000 FLATTVS msec gates 500 DGCS msec gates 1000 DGCS msec gates 500 FITLNTVS msec gates 1000 FITLNTVS msec gates 2.8) Gain Tests Line 91CA-9A Shots 184 to 904 Data input to test : Production FD Migration Displays 1: 25,000 1:100,000 Panel Panel : Stack panels with varying gains. 1) - 77 DB 2) - 79 DB 3) - 80 DB 4) - 81 DB 5) - 82 DB 1) — 81 DB 2) - 82 DB 3) - 83 DB 4) - 84 DB 5) - 85 DB 5) - 86 DB SECTION 3 PRODUCTION PARAMETERS Processing record length was 3.0 seconds at 2 msec sample rate. 1. True Amplitude Recovery : 5.0 dB per second from 0 to 3 secs Spherical Divergence corrections applied. 2. Pre-Deconvolution Ramp To remove and attenuate first break energy the following mute was appl ied.All data being zeroed prior to the start times: Ramp Length : 100 msecs Offsets (metres) : 79, 3066 Start times (msec): 0, 2250 3. Velocity Filtering : F-K domain velocity filtering cuts: Positive : 7.0ms/trace Negative : 3.0ms/trace were applied with normal cosine ramping to all shot records. 4. Designature : Using an OFFSET DEPENDENT wavelet. Fmax=200 HZ 5. Adjacent Trace Sum : Adjacent field traces summed 2 on 1 6. Deconvolution Velocity Analysis Demultiple : Predictive Deconvolution applied to all traces in a time variant manner.Gate design overlap 25 %. Gate application overlap 50%. Gap : 32 msec Filters: 2 X 168 msec Offsets (metres) : 79, 3066 Start times (msec): 0, 2250 End times (msec):3000, 3000 : 21 depthpoint velscans every 2.0 kms : Multiple velocity function derived from Primary velocity allowing 15% attenuation.Negative cut velocity of 80000 m/sec in the F-K plane. Velocity Analysis : 21 depthpoint velscans every 2.0 kins Normal Moveout Correction: Using velocities interpreted from item 9 above. : Shot and streame: average. : Ramp length : Offsets (m) : Start times(ms): : Ramp Length Offsets (metres) Start times(msec static : 12 msec Static Corrections Inside Trace Muting First Break Suppression 100 msec 79, 187, 527, 528 400, 600, 2250, 3000 : 100 msec : 79, 3066 : 0, 2250 Migration : F-D Migration Version 1 45 degree algorithm MEDIUM fidelity : Timestep - 24 msec Using velocities smoothed and scaled by 20 percent below the Basement. Common Depth Point Stack : 60 fold straight stack. Time Variant Filtering : Time (msec) 0 500 900 1300 1700 2100 2500 Frequency (Hz) 8-85 8-85 8-75 5-65 5-55 5-45 5-40 Time Variant Scaling : Using Digital Gain Control Scaling 1000 msec gates. Start time: Waterbottom Displays (Full Scale) Displays (Small Scale) : Final stacks and migrations were displayed at 1:25000 and 10 cm/sec. : Final stacks and migrations were displayed at

1:100000 and 10 cm/sec. APPENDIX A FIELD RECORDING PARAMETERS Data Shot by - H.G.S. Party 2840 M.V. Magnificent Creek Date Shot - December 1991 Recording Instruments - TITAN 1000 Recording Filters Recording Polarity High Cut Filter: 180 Hz @ 72 dB/Oct Low Cut Filter : 8 Hz @ 18 db/Oct - A positive pressure at the hydrophone produces a negative number on tape. Digital Tape Format Seg D 6250 bpi Record Length/Sample rate - 4.0 seconds at 2 msec Energy Source - 1090 cu. in. Airgun operating at 1800 p.s.i. Source Depth - 6.0 metres average Shotpoint Interval - 25 metres, 1 Pop per Shotpoint Cable Length Cable Depth Coverage 3000 metres, 240 Groups,12.5m Grp.Int. 10 metres average. 60 fold, 240 trace. -Al- APPENDIX B LINES PROCESSED LINE S.P. RANGE KILOMETRES 91CA-01 101 - 3764 91.60 91CA-02 101 - 3759 91.47 91CA-03 101 - 3763 91.57 91CA-04 101 - 4786 117.15 91CA-05 101 - 3751 91.28 91CA-06 101 - 2547 61.17 91CA-07 101 - 4309 106.72 91CA-08 101 - 2540 61.00 91CA-09A 101 - 2543 61.08 91CA-10 101 - 3285 79.63 91CA-11 101 - 2847 68.68 91CA-11A 101 - 619 12.95 91CA-12 101 - 6116 150.40 91CA-13 101 - 3220 78.00 91CA-14 101 - 3041 73.53 91CA-15 101 - 6133 150.82 91CA-16 101 - 4732 115.80 91CA-17 101 — 3427 82.18 91CU-01 101 — 1356 31.40 91CU-02 101 - 1275 24.38 CR< < , . 1A APPENDIX C lines in the project were SEG-Y TAPE INVENTORY Raw stack and migrated data,for all output at 6250 bpi in SEG-Y format. LINE S.P. RANGE RAW STACK RAW MIGRATION 91CA-01 101 - 3764 805694 805688 91CA-02 101 - 3759 91CA-03 101 - 3763 91CA-04 101 - 4786 805695 805689 91CA-05 101 - 3751 91CA-06 101 - 2547 91CA-07 101 - 4309 805696 805690 91CA-08 101 - 2540 91CA-09A 101 - 2543 91CA-10 101 - 3285 91CA-11 101 - 2847 805697 805691 91CA-11A 101 - 619 91CA-12 101 - 6116 91CA-13 101 - 3220 805698 805692 91CA-14 101 - 3041 91CA-15 101 - 6133 91CA-16 101 - 4732 805698 805693 91CA-17 101 - 3427 91CU-01 101 - 1356 91CU-02 101 - 1275 -Cl- APPENDIX D CR2 4781 A PROCESS DESCRIPTION “RUE AMPLITUDE RECOVERY (TAR) Function: Spherical divergence and absorption correction in order to produce output records on which the relative amplitudes of eflections are approximately true. Concept: TAR is achieved by multiplying data samples by record ime (in milliseconds) for spherical-divergence losses and by an xponential term of 10 to the power of aT/20, where "a" is a supplied attenuation coefficient in dB/second (typically 4-6 “43/second). RESAMPLE unction: Resample data to greater sample rate. Concept: Apply digital antialias filters and resample. Filters may ptionally be zero or minimum phase. A simple sample decimation may also be performed if desired. “RACE MIX (TRACOMP) unction: Sum shots and/or receivers to reduce data volume or simulate alternative field geometries. oncept: Summation of shots/receivers with or without weighting, running mix with a variety of weights applied to any number of traces is available to simulate alternative field geometries, ifferential normal moveout may optionally be applied before the ix. -DI- SPIKE DETECTION (SPIKTHRS) runction: Spike detection. oncept: The SPIKTHRS utility is designed to accept output from a reprocessing sequence and to analyse the data for high amplitude traces. Every trace in the submitted data is analysed over a 3er-submitted time gate and the highest absolute amplitude in each ate is compared to a user-submitted threshold. If any one of the absolute values for a particular trace exceeds the specified threshold, this amplitude value together with its associated time nd trace identification are written to a print file. The user is ^ole to list the print file and interpret the listing to identify traces that

may need editing prior to stack. PIKE DETECTION AND REMOVAL (DESPIKE) Function: Detection and removal of spikes. _oncept: The DESPIKE process is a statistical approach to the detection and removal of spikes. A seismic trace is divided into a eries of contiguous time gates and the standard deviation from the race mean absolute amplitude is determined from the gate absolute amplitudes. Anomalous gates are those whose mean absolute amplitude Ls more than a specified number of standard deviations from the race mean. These anomalous gates are further statistically interrogated to determine the presence of spikes. If there are less than six adjacent spikes, the spiked amplitudes are removed and nterpolation filters are used to recover normal amplitudes. For ore than six adjacent spikes the region is scaled down with 100 ms ramps being applied at either end of the ramped zone. VELOCITY FILTERING (VELFILT) riinction: Removes noise in the F-K domain before■ common mid point stack. ncept: It may be performed in the shot, receiver, or common □mid point domain, or in any combination of these. The method used is: . Gather input into the required domain. b_. Optionally, apply datum or relative statics. Optionally, apply static shifts to linearise the offset distribution for crooked lines. . Optionally, perform time-variant scaling to the traces. The scalars are stored for subsequent removal after velocity filtering has been performed. This option reduces the effects of high-amplitude noise bursts. Perform a two-dimensional Fourier transform into the frequency wavenumber domain. Zero certain portions of the F-K plane. For conventional "fan" type velocity filtering these regions are defined in terms of a keep region delineated by two cut lines, one in the positive half and one in the negative half of the F-K plane. Alternatively, a "notch" type cut may be defined by a single cut line about which a zone of the F-K plane is zeroed. The "notch" cut is a milder form of velocity filter and may be used to attenuate specific noise trains such as direct arrival energy or air blasts. In either case, the positive cut line may wrap around at K nyquist ntil it either intersects the other cut line (fan cut), or raverses a given percentage of the plane (notch cut). A cosine scalar (as a function of K) or a linear taper may be pplied to the edges of the keep zone. The cosine scalar option a. educes the effects of the function performed in the K domain and eliminates any line ups that may be generated by the linear taper. ptionally, the keep area may be "lozenge" shaped or on a "pedestal" (so that the reject area is partially retained). . Perform the inverse two-dimensional transform back into the time-distance domain. h. Remove any scalars applied in step d. . Remove any statics applied in steps b. and c. E the data are recorded using a split spread, each half of the spread may be processed separately, or combined. his process is extremely effective in the shot domain at removing .hot-generated noise, e.g., ground roll. In the receiver domain, it can be used to remove back-scattered noise, e.g., from escarpments r sand dunes or shallow-water off-line reflectors. When the rocess is applied in both domains, it is possible to remove a considerable amount of random and coherent noise. It is not normally performed in the common mid point domain because the noise 5 not as well organised. WHITENING DECONVOLUTION unction: Pulse compression of seismic wavelet and short-period reverberations. oncept: Predictive whitening deconvolution based on ..iener-Levinson techniques. Filters are designed from autocorrelations, assuming wavelet is minimum phase. Filters may be 'ssigned and applied in overlapping time gates. CAPPED DECONVOLUTION junction: Removal of short-and intermediate-period reverberations from

seismic data, possibly with pulse compression, depending on ength of gap. Concept: Predictive deconvolution operating in the same way as hitening deconvolution, except that a non-unit prediction distance s used. ^SIGNATURE (DESIG) runction: Estimation and removal from data of source, receiver, and instrument response plus short-period reverberations. The estimated avelet is collapsed to a band-limited zero-phase output. Concept: This is a prestack deconvolution process designed to ^>llapse the effective ■source wavelet, or signature, to a short, harp, zero-phase wavelet, thereby maximising resolution on the seismic trace. The effective source wavelet is the wavelet resulting from the convolution of the actual source wavelet with host effects, near-surface short-period reverberations, and x.ecording instrument response. Both standard and offset-dependent DESIG are available. In the former the entire shot record is used estimate the signature □giving a greater statistical basis for avelet estimation than is available for normal deconvolution. If it is thought that there are effects which vary significantly with “ffset (e.g. cable depths), an offset-dependent SSIG may be applied. This splits the shot record into four (normally) offset groups. This still offers a significantly greater Statistical basis for wavelet estimation than conventional sconvolution, but not to as great an extent as standard DESIG. With conventional single-trace deconvolution, it is possible that ariodicity of a reflection series may be seen as an effect to be amoved. Because DESIG is designed over a substantial offset range, moveout effects ensure that any signal periodicity is different on <=>ach trace and will, therefore, not be removed. Logarithmic /eraging of trace spectra is employed to ensure that anomalous braces do not affect the estimated wavelet design. The average amplitude spectrum is modified at the low- and high-frequency ends o reduce the effects of gating and noise. A Hilbert transform is sed to compute the phase spectrum of the effective wavelet because it is assumed to be minimum-phase. From the averaged amplitude oectra and computed phase spectra an inverse filter is designed ad applied to the data. Due to variations in coupling of each receiver group it is possible, on land data, that the effective wavelet of each trace is made up of two parts, one due to its shot cation and the other due □to its receiver location. In this case jl t is possible to apply two-pass DESIG, first in the shot domain and then in the receiver domain. Two-pass DESIG is also useful in asolving phase problems caused by recording systems involving : ixed geophones and hydrophones. In this case, the process would be applied initially in the receiver domain. When two-pass DESIG is sed a minimum phase (rather than a zero-phase) wavelet is output f the first pass. Designature generally assumes that the incoming data is minimum- iase. However, a zero-phase option is available, for those cases .n which the input wavelet is believed to be zero-□phase, and no phase correction is done (i.e., a zero-phase filter is applied), rocessing proceeds as in minimum-phase designature, but the phase pectrum of the estimated wavelet is zeroed before filter design. -K DEMULTIPLE (DEMULT) Function: Removal of longer period multiples which have different MO from primary events. Concept: This is a multiple-attenuation program. It is a prestack ' C requency-domain process in the CMP domain and utilises the moveout eparation between primary and multiple events. In order for demultiple to be effective it is essential that velocities of both Drimaries and multiples be known accurately, that there be adequate oveout separation between multiples and primaries, and that there ~e adequate fold of data (normally at least 24). The data is

effectively corrected with the multiple velocity and all flat-lying \zents removed. Because of the minimal separation between multiples nd primaries on near offset traces, some attenuation/distortion of primaries often results at these offsets so that, after application the process, it is usually necessary to mute some of the near races prior to stack. Velocity analyses before and after DEMULT are usually required. "IP MOVEOUT Function: Dip moveout (DMO), or partial prestack migration,, has hecome widely accepted as a method that comes closer to producing true zero- offset section than does conventional NMO. DMO corrects for two problems in conventional NMO and stack: Reflection smear as a function of dip in CMP stack, ip dependence of NMO velocities. Concept: HGS has implemented DMO in both the time and F-K domains, “hese implementations are explained in the following sections. ELSCAN Function: Specialised velocity determination program. oncept: At each location a specified number of consecutive common mid points are input to the analysis. The Display consists of four "arts: a. The center CMP of the input range displayed uncorrected and, optionally, NMO corrected with a specified number of input velocity functions. These velocity functions can be input manually or calculated automatically from a central function. Typically, seven different velocity functions are used. . Stacks of the input CMP range with each of the specified velocity functions. . A velocity scattergram which is a plot of velocity versus time and shows the velocities used for the adjacent gather and stack displays. The picks on the plot are determined by the sophisticated "700-Package Moveout/Dip Scan” technique. Amplitude maxima of discrete events are picked as a function of moveout, dip, and time. The plotted symbols can be coded on the basis of pick amplitude if required. Velocities of these events are plotted versus time. This is the most commonly used form of velocity analysis in production processing. . As well as the main plot, subsidiary plots of amplitude or dip versus time can be obtained together with a listing of any or all of time, velocity, amplitude, or dip for the largest picks within specified time gates. ”ELPAC Function: Specialised velocity determination program. oncept: Similar to VELSCAN except that automatic velocity picking u-s performed by the less sophisticated method of a time-gated power-based search, incorporating a dip search, on the stacked ata. QUIVER xunction: Interactive software package for QCing and editing seismic velocities. oncept: QUIVER is an interactive software package for quality assurance and modelling of velocities and horizon time derived from ~urface seismic data. The package may be used to review, edit, and del velocities derived from both 2D and 3D surveys and includes □raytracing/inverse raytracing algorithms for analysis of RMS and migration velocities. digitised velocity functions and horizon times are loaded to a prospect data base on the workstation. The integrity of the ‘igitised data may be ensured using a variety of display options on he workstation screen. Anomalous data values may be studied in detail, then modified efficiently and consistently. UIVER software is designed to run on IBM-compatible personal computers. The structure of the QUIVER shell is intended to allow the package to be extended easily and quickly. „uality assurance is supported by sophisticated contour displays in two QUIVER modules. ection iso-velocity contour plots provide a simple method for checking consistency of 2D and 3D rms velocity data. A mouse or keyboard-controlled pointer may be used to indicate areas on a line r more detailed analysis. The interpreter □may opt to edit or view v. cross-line velocity contour at the marked location. When an edit

function has completed, the screen is automatically updated to isplay any modifications. Horizon contour plots allow a powerful, alternative view of 3D J ata. The QUIVER software horizon contour module provides a number f quality assurance capabilities: Velocity contours at specified time, knee, or horizon xime contours at specified knee or horizon ix interval-velocity contours, computed from input rms velocity, t specified time or horizon. 1L gain, a pointer may be used to mark a location. The interpreter ay then call for either an editor function or the section velocity contour module. Thus, the interpreter may move easily between horizontal and vertical displays of velocity-related data. K DIVER software is available for lease or license and may be supplied with suitable hardware if needed. Prices are available by 'equest. NORMAL MOVEOUT (NMO) CORRECTION ^unction: Application of Normal Moveout (NMO) and Static corrections to CMP gathers and output stack traces. oncept: NMO is based on velocity functions at each mid point developed by linear interpolation of horizon times and velocities x rom the control points used for determining the velocities. NMO nd static application is performed using interpolation filters to apply time shifts with a higher resolution than the sample rate of the processed data. TRAIGHT STACK ^unction: To sum all NMO corrected traces contributing to a articular common midpoint position. Concept: Straight sum of all NMO corrected traces contributing to particular common midpoint position. Recovery scaling is erformed to compensate for zones containing less than the full fold number of traces. The signal-to-random-noise ratio improvement 1_ s NO. 5, where N is the number of contributing traces. FINITE DIFFERENCE MIGRATION (FDMIG) unction: A time domain recursive migration method that is useful where high uncertainty in the velocity model exists, or the data is xcessively noisy. Concept: HGS's FDMIG is a finite-difference time migration .applicable to 2D and 3D data. The implementation used in FMDIG is modified version of the well known Claerbout technique for recursive finite difference migration in the time-space domain and is able to accurately handle time variant velocity fields. For 2D ’nd 3D data, as is common with other F-D migration implementations, he mapping accuracy in the presence of a constant velocity becomes inaccurate for dips larger than the stated dip limitations of the -lgorithm. FDMIG supports 15, 45, and 65 degree implementations. Velocity information may be input from a file created by the .SPACEVELS velocity modelling program, containing times and interval elocities. Alternatively, depth/interval velocity or Vrms/time or ».ime/interval velocity may be specified. In contrast to HGS's F-K migration programs, all velocity input is assumed to be in the igrated position. Outputs from the command are migrated traces in he time domain. IME-VARIANT BANDPASS FILTERING (TVF) Function: Apply time-varying filters to stack or migrated data, he application time of filters may be spatially varied. Concept: Design and apply zero-phase bandpass or bandreject "liters in specified time gates. Interpolation of filters is erformed between gates. Bartlett smoothing, normalisation, and Kaiser-Bessel windows are optional. Any specified filters may be applied in a time and space variant manner. " LATTVS Function: Time variant trace scaling. oncept: Scalars, inversely proportional to rms trace amplitude, are computed for adjacent time gates on each trace. Scalars are applied to each gate with scalar values being interpolated between entres of gates. Overlapping gates are supported. GCS Function: Digital Gain Control Scaling - a digital AGC method. oncept: The point-by-point scalars are the inverse of a trace amplitude model

constructed by rectification and filtering of the seismic trace. The triangular filter length may be from three ample periods to several seconds. ^ITLNTVS Function: Log averaging time variant scaling. FITLNTVS is similar to FLATTVS in that the lower amplitude gates are scaled up. owever, scaling down of higher amplitude gates is restricted. The result is to reduce the shadow-zone effect of TVS when very strong events are present. oncept: FITLNTVS is accomplished by taking the natural logarithm of the rms gates and fitting a least-mean-squares line through all f the natural logs of all gates. Any value that exceeds the fit ine will be reduced to the fit line. Inverse logs are calculated from the new values, then scalars are calculated by dividing 1000 by the gate value. Scalars are interpolated from gate centre to ate centre. Gates with less than 50% of the samples live will not *>e used in the calculations. In this case, scalars will be extrapolated to those samples from adjacent gates. Time variant ate lengths are not allowed. -DIO- -QRTTVS unction: A milder form of time variant scaling. Concept: Same as FLATTVS, except scalars are inversely “roportional to square roots of rms amplitudes in gates. This ssults in less modification to original amplitudes. -Dll-

O O N. <0 O ro CJ U co o ro LU o o IV o * o cr» to LEGEND °- Existing Seismic Lines Proposed Seismic Lines Permit Boundary Total Program = 1603.5 km NOTE: Distances shown are inclusive of tails Z1 :25OOOO C0MALC0 ALUMINIUM LTD 1991 CARPENTARIA MARINE SEISMIC SURVEY PRINCE KILOMETRES UNIVERSAL TRANSVERSE MERCATOR PROJECTION AUSTRALIAN NATIONAL SPHEROID PROPOSED PROGRAM Q/22P QUEENSLAND CENTRAL MERIDIAN 141 00 00 E COMPILED: R. Meaney . AMENDED 14 NOV.91 DRAWN: Traceson DRAWING NO: Q91 - 1708 Q0039501 ENCLOSURE NO. 4 SHEET 1

30 5 LlJ CD . CD CD CD 22 ZZ CD CD CD O zz m O CD • • CD CD UD 22 'S' UD CD CD — *■ ■— 1 ^r 8,769,000 8,750.000 11 30 S 91CU-02 1068000E 8701000N O) LUZ Sg o ° xT" 2® ■1096000b 8701000N , 91CJ-O2 8,700,000 LL)Z o° o c Cn 0 -’ ^co CD 12 00 S CD CD CD ■8,650,000 8,643,000 T UD m L±J CD CD CD CD CD CD CD CD ’T o CD CD CD LID ’T o CD CD CD -O' ELLIPSOID SEMI-MRJDR AXIS SEMI-MINOR AXIS PROJECTION U.T.M. ZDNE ORIGIN LATITUDE CENTRRL MERIDIAN ORIGIN SCRLE FACTOR FALSE NORTHING FALSE ERST1NG PROJECTION UNITS POSITION MAPPED RU5TRRL1RN 6378160.000 6356774.719 UNIVERSAL TRRNSVERSE MERCATOR 54 00 00 00.00 N 141 00 00.00 E 0.9996000 10000000.00 500000.00 METERS C.D.P. COMALCO EXPLORATION DEPARTMENT 1991 CARPENTARIA MARINE SEISMIC SURVEY Q23 P CARPENTARIA BASIN QUEENSLAND PRINCE r FA M • M H I—I 1 0 T1NRV -POST PLOT -080-5816-213033 -+PPC1 -01/06/92-2 S. MILES (1NTL)X 10 i KILOMETERS X 10 COMPILED: R, MEANEY 10/92 DRAWN: TRACESON 10/92 PROPOSED PROGRAM MAP Q0039502 DRAWING N? Q92 - 2018

o o ^r ^r Q0039503■

UJ o o _u o o LU CD CD LU C? o o o o o CD O CD 00 oos 30 OOS 00 oos LOCATION COMALCO EXPLORATION DEPARTMENT 1991 CARPENTARIA MARINE SEISMIC SURVEY Q 23P , CARPENTARIA BASIN QUEENSLAND SHOTPOINT BASE MAP COMPILED: R. MEANEY 1 1/92 Scale 1:250 000 DRAWN: TRACESON 11/92 PRINCE Q0039504 DRAWING N<? Q92 - 2016 ENCLOSURE NO.5

ooo LU o CO O O LU CD o a I CD CD a o o co I o CO CD o CD Q co CD CD ’T O -r o 'q- UD r LxJ CD CD CD CD co CD LT) TT LID r—. 06) 16 CXI 1 CL (_) O') 1 ELLIPS0I0 SEMI-MAJOR AXIS SEMI-MINOR AXIS PROJECTION U.T.M. ZONE ORIGIN LATITUDE CENTRAL MERIDIAN ORIGIN SCALE FACTOR FALSE NORTHING FALSE EASTING PROJECTION UNITS POSITION MAPPED AUSTRALIAN 6378160.000 6356774.719 UNIVERSAL TRANSVERSE MERCATOR 54 00 00 00.00 N 141 00 00.00 E 0.9996000 10000000.00 500000.00 METERS C.D.P. NOTE Water depth data from surveys conducted by 1980 Hematite Petroleum Pty. Ltd. 1980 Survey Shell Company of Australia Ltd. are included in this contouring to provide additional form. Contours are measured in metres. COMALCO EXPLORATION DEPARTMENT 1991 CARPENTARIA MARINE SEISMIC SURVEY OFFSHORE PERMIT Q22P £ PRINCE Q0039505 Q0039505 1 P —q r r —r i—i i— S. MILES (INTL)X 10 1 i i i —L I 1 I - 0 1 2 1 3 I——1 1 -pzn—[=1—[=1 KILOMETERS X 10 j ‘ i i i 1 i t i i ~ 0 1 2 3 1 4 I 5 TINAV -POST PLOT -080-6816-213033 -+PPC1 -01/06/92-1 BATHYMETRY MAP COMPILED: R. MEANEY 6/92 DRAWN; TRACESON 6/92 1 : 100 OOO SHEET REF. 1 . 250 000 SHEET REF. DRAWING N9 Q92 - 1966 ENCLOSURE NO. 6

’T UD co 8.-6S.30C - B.o-43. 300 l CD CD •'T uD co ELLIPSOID SEMI-MAJOR AXIS SEMI-MINOR AXIS PROJECTION U.T.M. ZONE ORIGIN LATITUDE CENTRAL MERIDIAN ORIGIN SCALE FACTOR FALSE NORTHING FALSE EASTING PROJECTION UNITS POSITION MAPPED AUSTRAI IAN 6378160.000 6356774.719 UNIVERSAL TRANSVERSE MERCATOR 54 00 00 00.00 N 141 00 00.00 E 0.9996000 10000000.00 500000.00 METERS C.D.P. r i—i i—i i—i i—i w i o TINRV -POST PLOT -080-6816-213033 —PPC1 -01/06/92-2 LU o o o c? o CD CD CD xj T LlJ CD CD CD CD CD co CD CD CD CD O’ LTD CT) .—• O’ O’ 1 8,769.000 i - 8.750.000■ 006 1? 00 s 8.650.000 LlJ CD CD CD •O 1 CD CD CD CD CD Li < L ' n~ L 1 'J - 1 8.643.000 CD CD CD CD O’ S. MILES (INTL)X 10 -rrzrzzzz z / y / /i /P NOTE Water depth data from surveys conducted by (!) 1980 Hematite Petroleum Pty. Ltd. (II) 1989 Phoenix Resources Company of Australia are included in this contouring to provide additional form. Contours are measured in metres. Q92 - 1966 Q COMALCO EXPLORATION DEPARTMENT 1991 CARPENTARIA MARINE SEISMIC SURVEY ACCESS AUTHORITY Q23/P BATHMETRY MAP £ PRINCE 1 2 K1L0METERSX 10 ' J— : 3 Q0039506 Q0039506 COMPILED: R. MEANEY 6/92 1 : 1OO OOO SHEET REF. DRAWING N? DRAWN: TRACESON 6/92 1 : 250 OOO SHEET REF. Q92 - 1965

Q92-1998 09£l 5 0CC 1460 80-306A A O' < 1450 a tn 3 30 000 O jOCC 2 Scale 80-256A 80-256 fcO REFERENCE COMALCO LOCATION EXPLORATION DEPARTMENT PRINCE 1450 1 1 7 Inferred normal fault Zero edge Scale 1 : 100 000 COMPILED: R. MEANEY 9/92 oos oos Q92 - 1.998 Sheet 1 . 1380 53^0 Q92 - 1999 Sheet 2 Structural contour I I . ( DRAWING N? LU LU O o O <0 <0 o ID O I O O o ’T > o CD 00 CJ . X IO o 'T \ 1 >• CP o o °s O, °9 1280 91CA-■06 91CA-07 ' L_J 91CA-08 1350 1400 a3 9 ° -* ro N) A3 coo oo c O ro co o 1350 1260 \2 6 ° 1290 1280 <0 LU <0 UJ o — O O o 00 o o > to > 1 o 1 uo M o o 00 o O ’T ’q LU o X o o 00 o o ro A o o —r* i r - o ID o o o o o o co 04 1— o *r co 9ICA-07 H 13 0 Normal fault Tick on down thrown block 1991 CARPENTARIA MARINE SEISMIC SURVEY Q22P , CARPENTARIA BASIN QUEENSLAND NEAR BASE OF MESOZOIC SEISMIC MARKER (Z HORIZON) A n TWO WAY STRUCTURE MAP ] D (SOUTHERN SHEET) CONTOUR INTERVALS 10 MILLISECONDS DRAWN: TRACESON 9/92 Q0039507 Q92 - 1998 ENCLOSURE NO. 8 SHEET 1

OOSi. i H 1380 0 HC80-05 HC80-05 / — 91CA-0 r O/pi l 91CA-04 1330 i COMALCO REFERENCE Structural contour Q0039508 Scale Inferred normal fault B Zero edge Scale 1 : 100 000 TRACESON 9/92 DRAWN: 2 45 00S HC80-07 Q92 - 1999 Sheet 2 s Q92 - 1998 Sheet 1 EXPLORATION DEPARTMENT COMPILED: R. MEANEY 9/92 DO n CD 13 10 06V V °02> H 1470 1460 1430 1420 14 10 LU o <£> c> o o > 1 o o fO HC80-3A HC80-01 13 4q 1330 1320 91CA-03 o£ eV oeei (P «5> O' O o> 1270 .HCaD^3L-=. 09ZV OZZL ozz v WBU-aTSS OOEI. o^ v l3 8o 1370 CD CD row OO cd o> CD co I 0) Co o 'Y Co O Co / co co CO CD co CO o o o O °OPL HC80-03 1460 1440 OOM HC80-01 •fc. > CP ro CD > o o O o °C' Ossi c L <o LU — o o o > i o — o fO o SJ LOCATION X LU <0 > O CD o O o > 1 m 1 o CD o CH 1400 ■Normal fault Tick on down thrown block 1991 CARPENTARIA MARINE SEISMIC SURVEY Q22P , CARPENTARIA BASIN QUEENSLAND jt PRINCE J j™_ Q0039508 NEAR BASE OF MESOZOIC SEISMIC MARKER (Z HORIZON) TWO WAY TIME STRUCTURE MAP (NORTHERN SHEET) CONTOUR INTERVALS 10 MILLISECONDS DRAWING N9 Q92 - 1999 SHEET 2 ENCLOSURE NO. 8

1 2 35 00S 1 2 45 OOS HC80-07 HC80-05 HC80-3A HC80-01 (O LU O O o O > O 1 —» O KJ TT LxJ O O <0 <0 —* LD o o r~- > > 1 1 O 'T O1 <K 1269 1254 1233 30DC SOUL U 5500 ■2000 6000 1322 1316 1315 91CA-03 + 250C I 37R -a. I 320 1 3S4 I 359 I 378 I 379 I 37B 1321 1320 500 I 366 I 327 131 1 I 333 I 336 Gd Gd KJ 1329 3000 I 329 1 1 1254 1 I I I I 1 I I I I 1 I 1 I I I I 1 1 I I 1 I I 1 in td o Gd O Ld o cd o KJ O & •N u KJ rv o o o GJ o co GJ Ld o GJ O o Ld o u V) o o Gd KJ o GJ O O GJ KJ C 4b Gd 4b to 4b LD KJ Gd Q 0) 4b tD o Gd O UJ Gd KJ -W KJ Ln O O Ld o o CJ CD ro UJ o o Gd KJ CK Gd KJ KJ GJ Cl KJ 10 09 Gd KJ Gd KJ (D KJ ID GA KJ to Gd (D Gd (0 -P- u KJ GA Gd o o o KJ Ci LA CD 4b Cl Gd 4b •N 00 c» Gd on o KJ Gd tn o GJ Ci KJ LA Gd KJ KJ «O Gd Gd Gd Gd O o- Gd to Gd KJ to Gd O Gd Gd l/l Gd KJ Gd LA U KJ t/l LA <n Gd 00 0) GJ ID on LA Gd <b V 0 I 4 I 493 ID I *87 Ld N (TV 35 d — KJ rt30^ 4b Q KJ 91CA-■ □05 o 1378 Gd Gd — KJ Oi to 4b A Ln 4b 4b X KJ — © o <o — — n 4b 4b 05 DO cn <A •** ■■*'*- A. -h. 4b Jb LA ID CD fJ 4b 4b 4b C •'4 03 — LA Cl X ©3 C Gd IA 3000 1 24 1 7 ‘ 1209 1 241 ' 1216 1234 < 4500 1210 1235 1216 1 239 ' 1218 1245 ' 1224 124) ' 1212 1236 i 1216 1 244 ' 1215 1243 ' 1221 1 249 ' 1 231 1 246 < 1235 1 252 1236 1 252 1238 1 252 1 249 1 252 >246 1 248 1246 a 243 KJ KJ KJ KJ KJ KJ KJ KJ KJ KJ KJ KJ KJ KJ KJ KJ GA X 4b Jb GA 4» Jb 4b 4- 4b 4b Gd 4b 4* 4b GA U> l’i’54 5 KJ -k CO 00 O GA Gd GA KJ 00 •>d Gd ID KJ k — 186 ■18? 192 t 20 i 120S 6 4SOO I 209 1213 I o co o X TTTT 1 39 136 137 < 1 36 1 42 153 1 57 ■3000 GJ K> CD 1 S3« LA q 3 1F UJ o o o ro K. Ol TO73 u 1073 1 070 1 070 1070 1074 1076 1077 1 063 LD •’T Q92-2008 U02-4 - Ld 4b Jb © Q — kj 5500 - Gd -k — s zs UCAh Ld LA Cd tD KJ Cl U 1456 < 1457 < 7000 1455 i 1 456 ' tn 4b O1 o LD 1091 I 1 52 1214 1 096 1225 1096 1 226 1096 I 230 I 1 00 1235 1 I 03 o 1 2S0 1 253 1 257 1 263 I 264 1 267 1271 I 272 1 273 I 281 40C I 28 ibcsoayos 1 30C I 298 1312 I 31 I 1314 318 I 324 I 326 I 331 I 33i I 332 I 342 1 360 3500 1 3S8 1359 I 364 I 367 I 368 1 369 I 375 1605 I 3£7 I 392 a o un HC80-05 1410 432 I 428 I 428 I I 398 428 1 l 433 I 398 44) I 398 437 30C: I 431 I 393 426 I 1391 1 437 1395 1442 <' 1399 1 440 I 402 I 436 1439 200 ) 44 1 13)5 1399 1 447 1316 1391 I 446 I 320 I 40C 1 447 1316 1446 HC80-03 I 323 1416 I 407 1451 1407 1452 1396 I 446 1386 I 455 1366 1456 1390 I 462 I 396 2500 I 460 1456 1462 1 457 l«60 1435 I 450 1453 1434 1 4S3 1442 1451 1472 2SO0 1 4S0 1499 I 446 1504 1 450 I 500 I 493 1451 1 493 HC80-01 I 492 I 450 1496 1456 I 495 I 4S6 I 500 1451 1 496 1453 1 494 2000 1 464 1 490 I 497 1 480 1 48E 1483 1 473 1487 I 490 I 469 I 496 1 468 J; COMALCO EXPLORATION DEPARTMENT I 1 I 1 1 I I I 1 I I 1 1 I I I I oos C Q -k LA C •n C-i LA KJ o kj o o ui u o C3 O LA o o o Lb O KJ GJ O 03 GJ O KJ KJ O KJ O CD KJ Q KJ O O O o o o o n <x> GJ O k; 4b <T» O 4* L1 <O LA O O Gd © ■KJ O uA KJ O O O Ln O O KJ Ln O © KJ GA © o Gd cn KJ LA o o KJ Gd LA KJ Gd Gd KJ Gd Gd © Cl ci KJ O Cl GA O O O KJ KJ <D Gd LA KJ KJ KJ KJ KJ KJ O 03 Gd LA GA KJ tD C» KJ 40 LI Gd LA KJ © N> id nj ID <71 w ID KJ on <D KJ cn u GJ C KJ KJ Gd to Gd Cl KJ Gd O © KJ Gd Cl KJ KJ ID GJ KJ Gd Gd <D o o KJ O O' KJ UJ KJ <D 0) KJ <D LI KJ to Li KJ to Li Ld CD 1> 1 449 M 4 -X " ■tl i 45t iS PRINCE 4b 4* -w 03 to o 4b Cl GA KJ KJ KJ — O -si -x vi Ci o c» c» Gd GJ 4b GJ to to 00 •*< ~ 11J3 t Z l 1^5 <TS0(P 9^ ID O — KJ 00 Gd KJ Li LA l/l LI O — A *4 KJ KJ KJ 4b 4^ O — Ld Jb Jb 4b 05 "d 03 o cn o lj97_n @0i|’ 4* -X 4b N -d tD U 4. C> C> Ci KJ KJ KJ KJ Gd Gd ■Ld LA O KJ KJ KJ >d SO "N C 1 523 J.320. 0 _ _ u m u u u £32$^ £ 1 293 Gd 1 2&£ o o la r_ -cU-132 1 296 I 325 0 13I0 0 2000 2 2 '® 3 5 c c c Ld KJ 03 11sa j KJ 1 455 o o 1457 1 447 1439 4b LOCATION UJ X <0 UJ X LU CD O o o o O O CD o o CD O O LD O > t o wl KX o LD > 1 ’T o o t O o — CT) o> K> o coat CD O <A ro xr 1991 CARPENTARIA MARINE SEISMIC

SURVEY Q22P , CARPENTARIA BASIN QUEENSLAND EAR BASE OF MESOZOIC SEISMIC MARKER ( Z HORIZON ) _ mAOr _ ANNOTATED TWO WAY TIME BASE ( NORTHERN SHEET ) Q0039509 COMPILED: R.MEANEY 10/92 Scale 1:100 000 DRAWN: TRACESON 10/9 2 DRAWING N? Q92 - 2008 ENCLOSURE NO. 9 SHEET 1

80-306A 80-256A LU O O LT) d o o Q d o o o 91CA-05 r a <» t o 80-30 6 A 1,^ CO o o 00 CJ z CO LU O O o o > o 1 o AJ ^r 1319 1283 1321 1287 SOO 1317 1 290 I 291 1310 1292 1 305 ■I 289 131 1 1 295 130S 1304 u -j 1307 30' 1295 I 295 1307 I 305 + 1304 3i 1302 1296 I 305 1304 C4 1 293 1293 I 296 I 286 1304 130. I 303 I 304 130' 3S0C 4500 1229 1225 J 1230 \227 2500 1226 i i i i i i i i i 44 O 44 O o CM K) •N 44 O 44 CT 44 N. CM o o o 44 Q d LA O o KJ d O KJ X d KJ 00 X KJ 01 o o o CJ 44 KJ X 44 O CT d a o « K. <M 44 o 44 44 O d 44 O A GJ O d 44 O X 4A X CM 44 O Ml G4 O 01 44 O CA G4 O o c o r> KJ CD o G4 O CT KJ 03 G4 O AJ 0J CT CJ AJ GA O o AJ a> 44 AJ AJ 10 CM 40 CM KJ <0 40 0 CM AJ <D G4 d IO CM NJ <0 AJ 10 AJ 40 (0 AJ GO AJ 40 AJ » AJ a> d CT O AJ CD O CO <M KJ CM AJ 40 AJ O 44 K) 10 44 44 44 KJ 01 44 44 <4 01 09 NJ KJ -U 44 CM KJ on (/I 44 O KJ « KJ L4 O d U AJ d G4 O CT G4 AJ AJ 40 AJ CD d KJ 03 CD CT CT CM KJ CD m AJ CT 00 AJ rj PU 01 AJ CD INI CM AJ 01 An AJ O d 44 d 44 01 AJ 40 KJ 01 44 AJ 01 AJ 00 N. CM AJ CO 09 AJ CT d KJ CT ID AJ CT IO 1293 AJ CT ‘D CT d o o 1-303- *■ L4 M o a o CD a CM 44 O CT 1295 Grt Cl -q-w- 44 O N o o — o 44 44 O — 44 O AJ 1291 & n 1278 0- v k. CO co CM CM CM KJ KJ KJ 4. 4k Jk AJ — LI U U CJ — — ro m *s o -j -j < .1282.*-. KJ AJ I AJ AJ AJ AJ AJ CT “M CT -K 14 CT d 91CA-06 LU O LLt O LU n m z o <0 <o z O CO o o o i 00 in n o 00 o c> in < o — > > o m > CJ 1 1 1 1 1 o o —• -k o o ci 00 tn 01 o 1266 4 1 I’JbU D

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AJ d d PO d o AJ d CT KJ 01 o KJ X NJ CT AJ AJ o AJ CT AJ ct a KJ CT KJ CT AJ CT CT -CM AJ >1 PJ AJ CT CD N> CT 00 KJ LA KJ d CT NJ d 10 KJ d ID KJ d X AJ d 00 KJ d NJ 4k 01 KJ 4. 41 AJ G cr» AJ 4*. N> NJ AJ AJ 01 AJ PO CT AJ AJ 01 AJ AJ KJ NJ d AJ KJ O AJ CT AJ 4k AJ 01 AJ PU KJ KJ CT A. — O AJ AJ — O KJ O 40 ID 03 <7> co <n <A 03 o 03 03 O> IO O> <73 00 PU CT d AJ CT X AJ d 09 KJ d pj AJ d CT AJ GA AJ d PJ KJ d AJ 01 AJ AJ d 1 00 K) CT CT AJ CT AJ CT AJ CT o AJ■ d co KJ d l 265 I 265 I 266 126S 1 262 1 266 1274 1 261 I 253 1 268 1268 1 267 I 268 1272 I 265 1 267 1 268 1271 1267 1 269 1267 AJ GA PO d N> d AJ d d AJ d CT KJ 0i ** AJ CT AJ ;oo to o o Q AJ CT d AJ CT as KJ 0) O AJ CT 44 AJ CT AJ 01 G4 AJ d co AJ CT a AJ O CT O AJ GA O o KJ d KJ d KJ d KJ AJ AJ Ln .u b Ln m KJ 4k <0 AJ d oo KJ d 00 1 244 1250 I 255 I 251 I 246 I 250 1 247 1251 I 252 1 2S4 1 250 1 2S0 1 246 I 247 I 250 1253 I 255 1 247 SSOO KJ 4k 40 KJ 4k AJ G1 KJ J*. AJ -O- AJ Jk AJ -O O 91CA-06 S00: AJ d PQ AJ d NJ GA X AJ d KJ CT AJ 4. AJ KJ PO AJ 44 4b 4. CD Cl K> 4A O AJ d AJ AJ AJ 44 NJ 44 ID KJ 44 01 AJ 44 OO KJ 44 X AJ AJ 01 KJ NJ "M KJ NJ d AJ 44 AJ 1258 I2S7 1 260 1 255 I 248 1 249 1 24£ AJ CT CT AJ PJ AJ CT OS KJ 0> AJ AJ CT "N CT — AJ CT GO KJ d O o 44 o CT CJ KJ 44 KJ KJ KJ CD AJ AJ d AJ AJ GO AJ AJ CT KJ AJ NJ KJ KJ PQ G4 AJ 4D AJ O d AJ O JO KJ Q X KJ O 196 M CH O a 80-306 195 1 9-’ I 96 l □90 6 A 3-tl 6 CO Ln a o 91CA-07 42S4J veeiSi CM CM I 268* CJ — CM CM CM CT CM <?» 40 CM CT CT CM CT CT CM 1*1 CT CM CM CT CM 01 CM n Cl CM m CT CM — AJ CT CT CM CM CT CO CM CT CM 1272 1 262 I26S I 267 I 259 I 266 I 265 6 1266 I 264 I 266 I 264 I 260 1 264 1262 I 259 I 254 1257 1 254 1255 1254 I25S TTss" 1257 122? 1 226 sooo AJ 0> 00 AJ CT CT AJ CT CT KJ 01 CT AJ d 0i AJ CT AJ CT CT O O AJ GA KJ d CT M d CT KJ d X AJ d KJ GA O O N> b ^ 80-256* u u AJ 4. 01 KJ 01 AJ 4« d AJ 4- l/l KJ Jk d AJ 4- CT SSOO tn I < o a INI ■ ■CM N. I 273 i0i CO AJ AJ 4k 4* AJ 44 GO -C— KJ 4» 40 AJ AJ AJ 44 4b CT — NJ KJ KJ AJ A 4. Jk 01 A- Li kj 4» O AJ GJ CT AJ 44 AJ AJ 44 d KJ 44 O AJ AJ » -CV AJ O Cl CJ KJ 44 d KJ 44 AJ O AJ AJ AJ AJ K 44 4 "M G -O C 123S 1226 1218 1215 1214 00 LU o O -A o PGJ o m o NJ AJ CT KJ PU CT KJ AJ d AJ KJ GO AJ PO NJ PGJ AJ d KJ KJ 44 KJ KJ O AJ d AJ KJ KJ KJ O KJ CT PGJ O PO o CT KJ O A4 AJ “ D IO — NJ o o CT K-' KJ O CT 2 t tai CD 00 CD 01 GD d o in Scale KJ O KJ O to o rc KJ O o Ui tn o l-» tfi — in LO tn ro o o o L4 O 44 80-256 Q Ci c> 13 45 00S LOCATION COMALCO EXPLORATION DEPARTMENT 1991 CARPENTARIA MARINE SEISMIC SURVEY Q22P , CARPENTARIA BASIN QUEENSLAND NEAR BASE OF MESOZOIC SEISMIC MARKER ( Z HORIZON ) ANNOTATED TWO WAY TIME BASE ( SOUTHERN SHEET ) COMPILED: R.MEANEY 10/92 DRAWN: TRACESON 10/92 Scale 1:100 000 Jr PRINCE •nnnr Q0039510 DRAWING N? Q92 - 2007 ENCLOSURE NO. 9 SHEET 2 in o o CM I CM 0) O

80-306A 80-256A UJ LxJ cd o <0 CD n X o <0 <0 o ** o O 00 in o o > o < o — > > — o Q o o — 1 fU TT a> 00 Ul <n *— LU o X o o 00 o o m 2, o o *T 91CA-07 80-256 irt Q0039511 ■ENCLOSURE NO. 10 SHEET 1 LD T <T> m <0 UJ < co UJ o o CD O o 00 o O > p> > 1 o 1 LT) o o — fO co O CD 00 UJ LU o CD CD 1 CD O fU CD in f*D *r CD O TT 'T o> O) i CM CD O■

ro GJ cn 39 45 00E 000<, HC80-06 HC80-08 I > CO co HC80-I0 HC80-10 1290 LOCATION REFERENCE Structural contour 9ICA-I7 Inferred normal fault Zero edge COMALCO EXPLORATION DEPARTMENT DRAWING N? Scale 1:100 000 Q92 - 1995 i 00E GJ cn O O cn o o tn Normal fault Tick on down thrown block ENCLOSURE NO. 10 SHEET 2 Q92 - 1994 Sheet 1 Q92 - 1995 Sheet 2 tz PRINCE >310 1300 1360 r 33o 1260 1260 1250 1991 CARPENTARIA MARINE SEISMIC SURVEY Q22P , CARPENTARIA BASIN QUEENSLAND Q0039512 INTRA GARRAWAY FORMATION SEISMIC MARKER ( X HORIZON ) TWO WAY TIME STRUCTURE MAP (NORTHERN SHEET) CONTOUR INTERVAL 10 MILLISECONDS COMPILED: R. MEANEY 9/92 DRAWN: TRACESON 9/92

80-306A 80-256A 13 50 LU O o in TT CD m Cd Cd db LH NJ ro to CH 00 1 321 OOS OOS Gd <71 <D v» o o o Cd CH o- GJ GJ Cd LA Gd CH 0) <b KJ bj CT n> hj nj CD kj LA LA to CH o o o NJ ID NJ bJ •M ID KJ KJ KJ M **J Ji — KJ -c Cl—o- bj o NJ O' NJ cb NJ K> CH tJ <0 O I o 00 o X 1 ■321 I 320 6 500 1314 1315 1309 I 303 1315 1316 1309 1319 1333 I 324 I 326 Cd Cd GJ Gd CH <- NJ CD 00 Cd u NJ — a ** Cd LA ^80 -308^ 1354 i g I 345 63 CO O I o 00 o KJ 4. I£> NJ ■CH to LH KJ KJ KJ KJ O1 <-n OJ A. J- -K -0- O c- hJ Ln O Cd o Gd O O GJ O O NJ •N cn cn o o LU o CD o o o > o o NJ TT — T r> oos 1379 132? 1 378 1 328 500 1377 1 338 2000 I 378 1333 1373 1 336 I 367 1 340 1366 1337 1 327 I 345 1332 1341 1339 I 344 1348 1336 1329 3000 I 329 1328 + OOS 1 326 I 323 I 330 1326 3D0C 1328 1 326 80-306 3£5 4000 20CO I 329 4500 279 5000 80-256 COMALCO LOCATION EXPLORATION DEPARTMENT 5500 PRINCE 5500 Q0039513 2SOO I 4 I 1 1 I I I I I I I 1 1 I 1 nj •N o Gd O Gd •*d o Q O in in bJ O Ln O o Gd Gd bj O O Q O Cd o o bj (D 03 Cd bJ NJ ID CD Gd & NJ a GJ NJ CD Cd NJ bd CD GJ NJ LA Gd cr> -X o u o o NJ ID CO NJ 00 CT NJ ID av N) 00 Cd Cd NJ cd NJ ID LA Gd NJ C* Gd CD Gd NJ GA L4 O KJ cn o o NJ KJ on <zi h33S—<! Gd Cd — NJ P5 30^ Gd o uA Cd Gd — N> X. O NJ ID ID Gd Gd — NJ -d NJ 00 451 O XI453 I 45S 6 550C 1 W 115368 1 53«3 133*6 lB345?6 101 I < O 5> 7326 e> 1 348 b b 334S Gd — Cl 'd -o r Q-Wf co CO X LU o o —* o o o 00 o > > o m I 1 1 —• o CA cn o ’T LU O o Q92-2003 J33E. Cd G< S33t 1319 1 321 < 500 1 345 i 1341 ■1325 I 340 i 1320 1339 < 1 321 1 338 < 1321 1 334 < I 31 7 1 335 i 1315 1337 . 1 321 >326 1 1 32) 1332 - 1315 1 335 < 1314 1340 ' 1 30C 3500 1345 ' 1 299 1 346 < 1 299 1343 < l-■293-< - 1-337-4* NJ b Cd Gd Gd Cd Gd Cd Gd Gd NJ NJ Gd Gd Gd Gd Gd Gd Cd Gd Cd Gd 00 (, NJ Gd Gd .X LA ID o O — — — N> Gd Gd x. CH C I494N . KJ bj X *N a* LA CD O Gd 00 Q ID — — & Q Gd O’ 1940*’" »—"0438 >424 , 143? 1 427 1 435 1 430 • 1435 1 430 1 42? IjI46u 1 o c I 225 0603 U1 Q I J 2 J> o A - °t I 460 A 5000 1991 CARPENTARIA MARINE SEISMIC SURVEY Q22P , CARPENTARIA BASIN QUEENSLAND INTRA GARRAWAY FORMATION SEISMIC MARKER ( X HORIZON ) ANNOTATED TWO WAY TIME BASE (SOUTHERN SHEET ) COMPILED: R.MEANEY U/‘.)2 Scale :100 000 DRAWN: TRACESON 10/92 DRAWING N? Q92 - 2003 Q0039513 LU co LU co LU 00 LU O —•* O o MJ o O o o O 00 o o i o m > O n i > in < * s

fe. nj o •*r cn NJ O o i o co X. O U <n Xi m o m *<r <- ENCLOSURE NO. 11 SHEET 1■ ■

LOCATION COMALCO EXPLORATION DEPARTMENT PRINCE CO HC80-06 HC80-08 80-080H HC80-10 HC80-10 00E o o tn o o tn o o tn 90-080H SSE i/i £6£ ’ 33£ i O £G£ 1 ?9£ ’ ■1 09£ ! S3£ ! !2£' £9£ ' 1 92£ ! 99£ ! 200£ £^£' I 9£ I 92£ ' I S£ 1 62£ 1 £9£ ! 6Z£ ! ZZ£ ! £3£ ! 13£ 1 £3£ ‘ 6Z£ ' 09£ ’ 99£ 1 39£ ! 99£ 1 9Z£ ' 26£' 6S£ 1 S6£ ' l/£ ’ 26£ ! a 9 £X S S 3 £ £ 3 £ CJ w A LA U u c LA t LA r 99£ 1 1^ ' 1991 CARPENTARIA MARINE SEISMIC SURVEY Q22P , CARPENTARIA BASIN QUEENSLAND INTRA GARRAWAY FORMATION SEISMIC MARKER ( X HORIZON ) Q0039514 ANNOTATED TWO WAY TIME BASE ( NORTHERN SHEET ) COMPILED: R.MEANrY 10/92 Scale 1:100 000 | DRAWING N<? Q92 - 2004 DRAWN; TRACESON 10/92 | l40 45 00E ENCLOSURE NO, 11 SHEET 2 C4 tn

UJ LU LU LU o o O O O 3 X o o O n > O 00 00 o o O CD o o m o ro o o 1. O —* 00 o ••5 xr — — — 20 T 4OC0 HC80 -09 VACANT 30CC + + + 30 00S VACANT I H G 80-0 7 - CC82-21M CC82-21M r 00 H VACANT 80“306A Scale COMALCO REFERENCE Structural contours 1430 Inferred normal fault CONTOUR INTERVAL 10 MILLISECONDS Zero edge VACANT Scale 1 : 250 000 5250 xr HC8 o c> < <M I O 00 u X o o lO < CM CM oo I o K IQ CD o COMPILED: R. ■MEANEY 9/92 HC80-09 1 1,51 ^5398 DRAWN: TRACESON 9/92 i LU O O O ro 91CA-0I c.■ kJ* HC80H07 DUYKLN- HC8O-OS HC8O-O1 > oc O fc- Ct CC LU I- Z oc LU I H CC O :: o a> c> o ? 3 91CA-O2 91CA-03 91CA-04 / C* 91CA-05 ? 91CA-O6 91CA-01 o O <5» o CM CD 05 O o 05 Pera Head CD LU LU 91CA-O7 9ICA-O8 r> 91CA-09 \ if o ( } // CO 1 / //. co .irM VtZ-O |1CA-O9 o O i / /(Hj cv CD / CO / t— VACANT LOCATION Normal fault Tick on down thrown block WEIPA 00 oos ATP 373P Comalco Aluminium Limited Bridge Oil Limited . EXPLORATION DEPARTMENT 1991 CARPENTARIA MARINE SEISMIC SURVEY . Q22P , CARPENTARIA BASIN < prince QUEENSLAND Q0039515 Q0039515 30 000 INTRA GARRAWAY FORMATION SEISMIC MARKER ( X HORIZON ) TWO WAY TIME STRUCTURE MAP DRAWING N? Q92 - 2000 LU CD * 00 r> n i o 00 UJ O I U o O 00 o o m CD CD > CD O ro xr ENCLOSURE NO. 12 00 00S Q92-2000

CC82- 13 00 00S LU O o o o o z o 00 o I o CD ’T o T 4000 4000 HC80-09 *000 4000 3220 ■3000 40CC HC80-05 5000 2000 2OCC HC84**-03- HC8O-3A HC80-01 30CQ 80-3 06A 40CC 2DC0 40CC 8G-25 6 A 30C0 3000 COMALCO LOCATION 6000 3000 SEISMIC MARKER ■TIME BASE HC80- 2 l 16 9 I Oi CTt O O CO O > I (.4 o n Q u GJ r > Cj n o i 3QQfl J> X 33 ® N’ HC8O-O7 HC80-05 80-306A tj' o 74 G> (") O Ga o X 00 o O^O IP CO ct o o o 00 cv 0 cn co □Ul to W — *3 10 O -O O •— o o 00 — CJ Cfl xD - HC8O-O7 X GJ -HC80-03 co .» v> N? -V HC80 g J? g l oc I O * o o l 25 t 115 1 23 < >09 > 20CO 121 < 97 < I 30 i IOC 126 < 162 <) 03 O O Q O — p » X X O z S ^o3 J7J 1 ) oc o o o 10J i ,74 i 9? 97 <L m 96 107 | 3ocq 70 C> 95 1 02 | 1 ® 00 » 00 x « co <£) Q 1 & G* M G4 O 00 -1 04—0 x K) o o - > - r ? * CMOCO S000 6000 i co ■LU o t co LU O u o <0 O O 00 o «K O o > to O o 00 O o Tr •*r EXPLORATION DEPARTMENT 1991 CARPENTARIA MARINE SEISMIC SURVEY BASIN Q22P , CARPENTARIA QUEENSLAND INTRA GARRAWAY FORMATION ( X HORIZON ) ANNOTATED TWO WAY COMPILED: R. MEANEY 10/92 Scale 1:250 000 DRAWN: TRACESON 10/92 PRINCE •wnr Q0039516 DRAWING N? Q92 - 2009 ENCLOSURE NO. 13 LR2 tats ui o o o o 13 00 00S 0) o o CM I CM O O

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12 35 OOS 1245 OOS HC8O-O7 HC80-05 1.3 00 OOS HC80-3A HC80-01 13 15 OOS REFERENCE Inferred normal fault Zero edge LOCATION Q92 - 1997 : Sheet 2 ' Q92 - 1996 Sheet 1 COMALCO EXPLORATION DEPARTMENT £ PRINCE LU O O in CP HC80-05 HC80-03 OOS OOS LU LU o o <0 o 00 o O o o i m > o < o o o 00 o o 'J 3) X 'J o Ci o o <• teso-ars o o ■ ■co 05 CM CM !450 Structural contour 1 I Normal fault Tick on down thrown block HC80-01 o o O N. CO CM CV 1991 CARPENTARIA MARINE SEISMIC SURVEY Q22P , CARPENTARIA BASIN QUEENSLAND Q0039518 ( K HORIZON ) TWO WAY TIME STRUCTURE MAP ( NORTHERN SHEET ) CONTOUR INTERVAL 10 MILLISECONDS COMPILED: R. MEANEY 9/92 Scale 1 : 100 000 DRAWING N? DRAWN: TRACESON 9/92 Q92 - 1997 NEAR TOP OF UNIT A OF WALLUMBILLA FORMATION SEISMIC MARKER ENCLOSURE NO. 14 SHEET 2 <0 LU o o o > 1 o —— o to o Q LU (0 <o o O O o i 1 > < o in 1 o 00 — —* u cn 0) X o■

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2 20 30CC oos 3 3G CC82-21M - HC80J07 - HC80~0s| HC80 HC8O 80-306 > DC O 0C OC LU I- IX LU cc o 3A 01 CD LU LU — - CC82-2IM o Ci VACANT 80-2^6A LU LU LU LU O o o O O z z o Q O o > o 00 00 o O o o o o m O ro o o o 00 o TT — — — — 4QC0 HC80-09 + 91CA-O1 THICK '"THICK TH N 91CA-03 HC80-03 THICK CARPENTAR A Limited 91CA-O4 DEPRESSION HC80-01 TH CK TH CK 91CA-05 ' 80-30$ 6 0-3 0$A~ 91CA-06 TH CK 91CA-07 TH N P Q 2 2 91CA-O8 91CA-08 l 91CA-09 TH N THICK Scale COMALCO EXPLORATION DEPARTMENT LOCATION REFERENCE jT PRINCE : 0HE Structural contour Q0039523 5OCC Inferred normal fault VACANT CONTOUR INTERVAL 25 MILLISECONDS Zero edge Scale : 1:250 000 00 OOS ENCLOSURE NO.18 SJ o a c; Normal fault Tick on down thrown b■ 91CA-02 - o o DRAWING N? Q92 - 2002 VACANT EX.Q21P 91CA-04 / COMPILED: R. MEANEY 9/92 DRAWN: TRACESON 9/92 i LU O o o ro O ’T CU •T WEIPA 91CA-01 H G ■ ■80-O 7 HC80-0S WEIPA DEPRESSION ATP 373P Comalco Aluminium Bridge Oil Limited i ^9lCA-07 VACANT o -'T ' S i 1 6 1. 1. i < IO 1 O I < 1 — < O 0) o O) 1 f I 3 1340' 1991 ▼CARPENTARIA MARINE SEISMIC SURVEY Q22P , CARPENTARIA BASIN QUEENSLAND Q0039523 INTRA GARRAWAY FORMATION - UNIT A OF WALLUMBILLA FORMATION ( X - K HORIZONS ) ISOCHRON MAP

LU O o o o CD ro 12 20 00S r LU O O 13 00 OOS 14 00 00S L LLl o o o o CD ro CC82- LlI ’S- 4000 HC80-09 40DC 3000 3220 3OC0 3000 HC80-05 20CC 2000 2000 HC80-3A HC80-■

03 HC80-01 HC80-01 40CC 2000 5000 80-256A 3000 3000 LOCATION COMALCO EXPLORATION DEPARTMENT 5000 5000 3000 3000 ANNOTATED TWO WAY TIME ISOCHRON BASE Scale 1:250 000 COMPILED: R. MEANEY 10/92 B HC80 01 3280 (p o o r j O n o GJ GJ O O in DRAWN: TRACESON 10/92 •n v<05-C o © 80-306A i HC80-07 CC82-21M

7> o o o 3000 4000 - HC80-07 M G4 IxJ O O O o 20 oos J I- I 6000 VI o o o -N ZD U <0 d O ■CP A D - 09 l£ © ID - C I 75 i j 67 t I 55 i 55 1 I 64 ' 60 *4 v> V V> V) VI M ‘I VI -U 'P r 5^ 00 © O -K GJ GJ rv Lfl o VI (P f J u 56 < o c> o 38 45 5 6000 70 ‘l 4? 63 52 69 p <P iP J* p ‘p 95 cP 1 ° rj * VI >0 (c* 7* 40 G> O' •N M ‘Wi >3oc: 70 3 3 04Si 79 'l o 97 4 o © 70 < 1 00 < 75 , 102 < 73 ' 94 < 72 1 99 ' > » o) a a ji0B o Ip O’ -N 33 ID 33 £1 1 — A Vl U ’0 © Jk iQ <p 00 o 00 K. CO K. CD •£> 00 D «D 2HC8O-O5 00 oos VI o o o a 0 ?;? co o -d-Mcx — fO <v -c 123 0 c 10 ■k. — “ iny in tn 11 cm oj r> m m m *- id 7 7coC * < CO K 0 v ' 63 • 70 6 I 0i 74 < <o 78 i ■77 t o 80 ' > 6? < 40C0 I 98 < — - 75 < o> BE ' S3 ( 81 i 61 ‘ PRINCE -ktihfir Q0039524 Q0039524 1991 CARPENTARIA MARINE SEISMIC SURVEY Q22P , CARPENTARIA BASIN QUEENSLAND INTRA GARRAWAY FORMATION - UNIT A OF WALLUMBILLA FORMATION ( X - K HORIZONS ) DRAWING N? Q92 - 2012 ENCLOSURE NO. 19 00 OOS CXI

WEEB CARPENTIER LOCATION COMALCO tXKONATIOM DCMRTMENT Slruclural eoolota — MH—> ktlarrad normal Inuit Znro »0j» Normal laidl Tick on down thrown block Q92 - 2017 £ PRINCE I 1 \ \ ( i I b i V. 5 ; 1 - • / Q0039525 1991 CARPENTARIA MARINE ■SEISMIC SURVEY Q22P , CARPENTARIA BASIN QUEENSLAND PROSPECTS AND LEADS ON NEAR HASE MLSOZOIC SEISMIC MARKER I Z HORIZON j TWO TIME STRUCTURE MAP COHF1C0 A. WCANET »/»t Seal* 2 50 00 0 ENCLOSURE 20