77606055 Eksploration of Th NOrth Madura Platform

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IPA01-G-138

PROCEEDINGS, INDONESIAN PETROLEUM ASSOCIATION

Twenty-Eighth Annual Convention & Exhibition, October 2001

EXPLORATION OF THE NORTH MADURA PLATFORM,

OFFSHORE EAST JAVA, INDONESIA

Rachmat Mudjiono*

Gadjah Eko Pireno*

ABSTRACT

Cities Service initiated exploration of the offshore East

Java Basin in the late nineteen-sixties, holding the vast

(157,000 sq km) North East Java PSC from 1969 until

1979. Cities shot 46,295 km of seismic data and

drilled 48 wells, including three on the North Madura

Platform. This feature is a stable high flanked by

known hydrocarbon kitchens to the northwest (Central

Deep) and south (Madura Basin), and it attracted

more drilling by later operators. Like the Cities wells,

these wildcats found teasing shows of oil and gas but

no commercial accumulations. Exploration continued

to focus on shelf edge buildups close to hydrocarbon

source areas in adjoining depositional troughs. The

wells encountered problems with reservoir quality, and

sharp velocity gradients confounded attempts to image

b i d t t ith i i d t

The new (2001) Bukit Tua and Jenggolo oil and gas

discoveries targeted reservoirs in layered Kujung

carbonates near the center of the North Madura

Platform, 10 to 20 km from the fringing reefs.

Porosity development in this area may result fromrepeated exposure on the crest of the old Madura

Platform. Migration pathways connect these

reservoirs to distant source kitchens via permeable

Kujung I carbonates and near-basement carrier beds

such as basal clastics and Ngimbang and Kujung II/III

carbonates. Confirmation of porosity and

hydrocarbon occurrence in these discoveries opens

the stable platform area to exploration. Fringing reefsremain a viable play, as indicated by other recent

discoveries in the Ketapang PSC (Bukit Panjang,

2000; Payang 2001) and nearby West Madura blocks

© IPA, 2006 - 28th Annual Convention Proceedings, 2002Disc Contents

Contents

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buried structures with seismic data 2000; Payang 2001) and nearby West Madura blocks

Cities Service initiated offshore exploration in 1967 on

their vast Northeast Java PSC, which covered

157,700 sq km offshore from Java, Madura, and Bali.Cities acquired 46,295 km of seismic data and drilled

48 wells. Most of these wells tested structural

features and/or reefal buildups in the top of the

Kujung Formation (Figure 2). Three of the Cities

wells were classified as oil discoveries, four were gas

discoveries, and one was an oil and gas discovery. Of

these, Cities produced only Poleng Field (located west

of the North Madura Platform, Figure 1) for a fewyears and then relinquished the block in 1979 without

a commercial success.

Five of the early Cities wells were drilled in the

vicinity of the North Madura Platform, although none

were located near the crest of the feature. Cities

drilled the JS 3-1 a few km northeast of the platform

(Figure 1) in 1970. This well encountered oil showswithin the Kujung and a poor oil show in the deeper

Ngimbang Formation, but it was not tested. Also in

1970, Cities drilled JS 8-1 in the Kujung reef trend

along the southeast flank of the platform. JS 8-1

encountered an oil show in the Ngimbang Formation.

Cities drilled the JS 2-1 in 1971 to test a fault closure

just off the north edge of the platform. This well

tested 4.6 mmscfd from thin carbonates within theKujung. Two more wells were drilled by Cities

Service in the Kujung reef trend along the southern

edge of the North Madura Platform before

Inpex operated a block covering this area starting in

1990. Inpex acquired a tight grid of seismic data,

concentrating on the southern portion of the NorthMadura Platform. They drilled three wells:

Cassiopea-1 to the north of the platform plus

Perawan-1 and Waluku-1 along the shelf edge trend

to the south (Figure 1). Of these, Perawan reported

oil shows and all were plugged and abandoned.

Gulf Indonesia signed the Ketapang PSC in 1998 and

proceeded to reprocess 5,634 km of existing seismicdata on the block. An additional 2,300 km of data

were acquired in 1999, filling in gaps to construct a

closely spaced grid of 2D seismic lines (Figure 3)

across the block.

REGIONAL TECTONICS

The East Java Basin is situated on the southernmargin of the stable Sunda craton and covers an area

of approximately 50,000 sq km. The basin formed in

the Eocene as a back arc basin associated with a

volcanic arc to the south (Figure 4). The

Karimunjawa Arch marks the western limit of the

East Java Basin , and to the east it is bounded by deep

water environments of the oceanic Lombok, Flores,

Salayar, and South Makassar basins. The East JavaBasin extends northeastward from the volcanic arc

offshore across the Java sea and back onshore in the

southeastern corner of Kalimantan and the adjoining



This extends southwestward across the Java sea and

appears as a band of basic igneous basement to the

northwest of the Ketapang PSC (Figure 5). Lowgrade metasediments surround the band of basic

igneous rocks and extend into the northwestern corner

of the Ketapang block. Southeast of the

metasedimentary basement are northeast-southwest

trending bands of acidic and intermediate igneous

rocks, indicating presence of a continental fragment

within the suture complex.

With continuing compression, the East Java Basin

underwent uplift and peneplanation during the early

Tertiary. A series of northeast–southwest trending

ridges and grabens then developed along the

southeastern edge of Sunda shield, perhaps in

response to back arc spreading. From west to the

east, the major features in this extensional complex

are the Karimunjawa Arch, the Muria h Trough, theBawean Arch, and the Tuban-North Madura High

(Figure 4). These features extend onshore, bending to

the west into an east northeast-west southwest

alignment.

The rift basins filled initially with a thick sequence of

non-marine clastics, including lacustrine shales,

starting in the Middle Eocene (Figure 2). A sag phasefollowed the rift episode, and basin fill in the grabens

changed upward into a fully marine Late Eocene to

Early Oligocene sequence of shale with local

series of depositional cycles. This study is limited to

the basal two cycles, the Ngimbang and Kujung,

which constitute petroleum systems now beingexplored in and around the North Madura Platform.

Pre-Tertiary basement underlying these units in the

vicinity of the Ketapang block consists of low grade

metasediments and acidic to intermediate igneous

rocks (Figure 5).

Ngimbang Cycle

The earliest sediments deposited on pre-Tertiary

basement were largely controlled by the underlying

basement architecture. These comprise the

Ngimbang Formation, which accumulated within the

grabens from the Middle to Late Eocene through the

Lower Oligocene (Figure 2). The lower Ngimbang

consists of a series of interbedded quartz sandstones

and gray to brown carbonaceous shales with minorcoals, which accumulated in brackish to lacustrine

environments. Lacustrine environments probably

developed in the graben depocenters during Middle

Eocene time, making the Lower Ngimbang a likely

hydrocarbon source rock in the East Java Basin.

Basinal sag resulted in widespread incursion of marine

environments during the Late Eocene, and marinesediments dominate the upper Ngimbang Formation.

These onlap the southern flank of the North Madura

Platform, as shown by the paleogeographic



The overlying Kujung II reflects a change to quiescent

tectonic conditions accompanied by regional

subsidence. These deposits consist of a transgressivesequence of shallow water carbonates and calcareous

shales. Localized carbonate build-ups developed on

stable high areas. Irregular and discontinuous seismic

events characterize the Kujung II and Kujung III

intervals in the North Madura Platform area,

indicating abundant lateral variation in sedimentary

facies. Deposition of these units was controlled to

large extent by the pre-existing northeast-southwesttrending structural pattern. Both Kujung II and III

units are important reservoir targets for current

exploration in the North Madura Platform area.

The Kujung I interval is a thick (1300 ft) carbonate

section that lacks the significant shale intercalations of

the underlying Kujung II. Figure 7 shows the

interpreted paleogeography for the Kujung I. Buildupsoccur as linear reefs fringing uplifts and isolated patch

reefs on stable platforms. A prominent shelf-edge

reef tract developed along an east-west trend parallel

with a present day Madura and Java northern coast

line.

Overburden

Four additional depositional cycles followed the

Kujung in the North Madura Platform area. Each

follows the pattern of starting with clastic

Trough area along the western edge of the

offshore East Java Basin (Figure 4). Although

quite shallow (3,000 ft) over the North MaduraPlatform, the Ngrayong remains a secondary

objective in this area.

3. Wonocolo (Middle to Late Miocene), widespread

deep marine shales and marls with minor sands

capped in offshore areas by major accumulations

of platform and reefal carbonates. These were

exposed in the Late Miocene and incised by aseries of channels, some cutting entirely through

the carbonate complex. Velocity contrasts

between slow channel fill deposits and fast

carbonates and the resultant sag in deeper seismic

events causes difficulty in interpreting depth

structure. These are discussed in the following

section on Depth Conversion.

4. Late Miocene to Recent deposition started with

renewed transgression and accumulation of highly

varied sedimentary facies. These include marls

and reworked sandstone, globigerinoid chalks and

reefal limestones, and a large influx of

volcaniclastic sandstone from the volcanic arc to

the south starting in the latest Pliocene. Local

tectonic effects became more severe with timeand have the greatest control on sedimentary

facies. Volcaniclastics and globigerinoid chalks

are major reservoirs in the early onshore



sources, but the study noted that the Eocene

Ngimbang is believed to have sourced 95% of the oil

and gas in the East Java Basin. Studies of particularareas within the basin by Phillips and others (1991,

Kangean Island area) and by Manur and Barraclough

(1994, Bawean area) also concluded that the Eocene

Ngimbang is the source for oil in those regions.

Source Rock Maturity

Corrected logging temperatures from wells drilledthroughout the East Java Basin indicate an overall

range in geothermal gradients from 1.4 to 2.4 deg

F/100 feet. In the vicinity of the Ketapang Block, the

average geothermal gradient is 1.95 deg F/100 feet.

Maturation models were generated using local log and

seismic data to examine the history of hydrocarbon

generation for two areas flanking the North Madura

Platform: the Central Deep to the northwest and theMadura Basin to the south (Figure 4).

The model for the southern part of the Central deep

(Figure 8) uses a geothermal gradient of 1.8 deg.

F/100 feet, based on local well control. It shows that

lacustrine and alluvial source rocks in the lower

Ngimbang sequence, with kerogen types I and II,

entered the window for oil generation (Ro 0.7-1.0)during Oligocene and Miocene time between 34-11

million years BP. Maximum generation (Ro 1.0-1.3)

occurred over a broad span of time from Late

Pliocene and remains there now (Figure 9). The

upper Ngimbang started maximum oil generation

about 6 million years BP and entered the gas windowonly about 1.5 million years ago. Kujung and

shallower strata are still in early oil generation or

thermally immature.

Results from the maturation modeling for the deep

basins adjoining the North Madura Platform indicate

that lacustrine and alluvial facies in the lower

Ngimbang are likely sources for oil and gas in the North Madura Platform area, but that marine kerogen

in the upper Ngimbang may also contribute. The long

history of oil generation and predominance of kerogen

types I and II in the lower Ngimbang bode well for oil

accumulation on early structures connected by faults

or carrier beds to the basinal source kitchens. Late

forming traps and those connected to current gas

generating areas may be more prone to accumulatedgas.

Reservoirs, Traps and Seals

Reservoir targets in the North Madura Platform area

include:

1. lower Ngimbang clastics developed on the flanksof the Platform,

2. upper Ngimbang carbonates, except for crestal

areas where this unit may be absent due to



inversion, and upthrown and downthrown closures

occur in association with major and minor faults in this

structurally complex area. Kujung gas tests in JS 2-1and the recent Payang-1 discovery show that some

fault traps work in this area, but the risk of fault timing

and seal remains a potential dry hole hazard. Less

vexing four way dip closures are recognized as low

relief structures on the undulatory surface of the

Platform and as structures formed by drape over

reefal buildups in the Kujung. Unfortunately,

significant velocity gradients pose a major challenge todepth conversion of structural interpretations on

seismic data. Imaging these subtle closures requires

accurate depth mapping, and proper depth conversion

of seismic time maps is a key factor in recognizing

prospect size and selecting well locations. Methods

used in siting the recent Ketapang discoveries are

described below.

The flanks of the North Madura Platform also have

potential for stratigraphic traps formed by onlap of

basal clastics in the Ngimbang. Several wells flanking

the Platform recorded oil shows in this unit, but as yet

there have been no commercial tests. The onlap edge

remains difficult to identify with confidence, but this

will likely improve with acquisition of 3D seismic data

and additional well control.

Shale in the Tuban Formation provides a regionally

extensive seal for Kujung fault traps and dip closures.

Payang (Figure 10). Faults may also be important in

plumbing source kitchens to carrier beds, which then

transport oil and gas updip into traps.

Play Concepts

Lack of success over 30 years of exploration has not

downgraded the exploration potential of the North

Madura Platform. Good oil and gas shows in several

early wells indicates that hydrocarbons have migrated

into the block. On the north side of the Platform,Kujung oil and gas shows encountered in the JS 2-1

and JS 3-1 wells proved hydrocarbon migration into

this area from the Central Deep. The southern margin

of the Platform has oil and gas shows in Kujung and

Ngimbang formations in the JS 19-1, JS 44A-1 JS 8-1

and Perawan-1 wells. This documents hydrocarbon

migrating from the southern kitchen area in the

Madura Basin. Recent study indicated that the previous wells were not located in optimum locations,

due in part to problems with velocity gradients and

seismic depth conversion. The best areas appeared

as yet untested.

Play concepts for this area are illustrated with a

regional northwest–southeast cross section fromCamar field to the Island of Madura, constructed from

both well and seismic data (Figure 11). Figure 11-A

shows generalized structure, stratigraphy, and source



Presence of gas in and around the North

Madura Platform was previously recognized from gas

shows in dry holes and from abundant hydrocarbonindicators on seismic data. Velocity gradients,

however, masked the significance of the gas shows

and confounded attempts to determine whether the

wells were optimally located. Recent detailed velocity

studies and new well control help address those

questions, and indications of gas reservoirs in all four

recent wildcats in the Ketapang PSC indicate the

widespread occurrence of Kujung gas in this area.Acquisition of 3D seismic data and more drilling are

still needed to quantify the size of these discoveries

and indicate remaining exploration potential for the

North Madura Platform.

Oil potential for this area was recognized by

maturation modeling following analysis of source rock

type and quality, geothermal gradients, and regional

structure and stratigraphy. This study showedmigration pathways providing access from Central

Deep and Madura Basin kitchen areas to potential oil

reservoirs in the Ngimbang and Kujung. Timing for

old dip closures on the crest of the Madura Platform is

ideal to receive hydrocarbons starting with the onset

of hydrocarbon generation. Fault traps need careful

study, but most appear to have formed in time to

capture oil generated during much of the period of peak oil generation.

Several wells drilled in the vicinity of the North

challenge to exploration success in the North Madura

Platform area. Problems with depth conversion of

seismic maps result from two types of velocitygradients: abrupt lateral changes in velocity caused by

channels in the shallow Wonocolo carbonate section,

and much less severe velocity gradients associated

with lithologic or thickness changes in the underlying

section.

The Wonocolo channels cause the biggest problems.

Prominent north-south and northwest-southeast

channels show clearly on the Top Wonocolo time map(Figure 12). These features are about 2 km wide, and

they incise deeply (250 ms, approximately 750 ft) into

platform carbonates of the Wonocolo. The channel

fill is much slower in seismic velocity than the

surrounding carbonates, causing a significant sag in

seismic events beneath the channels (Figure 13). This

sag indents deeper horizons such as the inter-Tuban

marker (Figure 14) beneath the shallow channels.Similar effects occur at the prospective Ngrayong,

Kujung, and Ngimbang horizons, and these shallow

artifacts must be removed to properly image structural

closures.

To remove effects of the shallow channels, time maps

for reservoir horizons were corrected prior to depth

conversion. Horizons between the Wonocolo andKujung formations are quite uniform in thickness

throughout the North Madura Platform area, indicating

relatively uniform sedimentation without major



seismic data. Average velocities generally increase

southward toward the shelf edge reef complex,

reflecting the change from interbedded limestone andshale in the platform area to massive carbonate in the

shelf edge reef tracts. Average velocity maps were

constructed and used for conversion of the seismic

time for the final depth maps.

CONCLUSIONS

1. The Central Deep and Madura Basin constituteeffective hydrocarbon kitchen areas for the North

Madura Platform. Hydrocarbon shows in wells

along the southern flank document oil and gas

charging from the Madura Basin. The JS 2-1,

which tested 4 mmscfd, indicates hydrocarbon

migration into the north Platform area from the

adjoining Central Deep. Gas tested in the Kujung

at Payang is closest to the Central Deep, butsourcing from either kitchen area remains

possible.

2. Long distance (25 km) migration along carrier

beds in the Ngimbang and/or Kujung charged the

central part of the North Madura Platform, as

indicated by oil and gas discoveries at Bukit Tua-1

and Jenggolo-1.

3. Reservoir thickness and quality remain poorly

defined for the North Madura Platform due to the

ACKNOWLEDGEMENTS

The authors wish to thank the Gulf Resources

Management, partner Petronas Carigali (Ketapang)

Ltd., and Pertamina for approval to publish this paper.

The contributions by the Gulf exploration staff,

particularly Chuck Caughey, Jim Parkin and the

drafting team are gratefully acknowledged. We also

recognize John N. Wilson and Christopher C. Gibson-

Robinson for recognizing the exploration potential ofthe North Madura Platform and leading early phases

of exploration.

REFERENCES CITED

Ardhana, Wayan, 1993. A Depositional Model for the

Early Middle Miocene Ngrayong Formation andImplications for Exploraton in the East Java Basin,

Proc. of the Indonesian Petroleum Assoc., 22nd

Annual Convention, v. 1, p. 395-443.

Bransden, P.J.E., and S.J. Matthews, 1992. Structural

and Stratigraphic Evolution of the East Java Sea,

Indonesia, Proc. of the Indonesian Petroleum Assoc.,

21st

Annual Convention, v. 1, p. 418-453.

Courteney, S., Cockcroft, P. Miller, R., Phoa, R.S.K.,

and A.W.R. Wight, ed., 1989. Oil & Gas Fields Atlas,



Vol. 1 - 715

FIGURE 1 - Location of North Madura Platform and Ketapang PSC, offshore East Java, Indonesia. Wells in the vicinity of the

Ketapang PSC are shown.

F

i

g

TUBAN-1

JENU-1

JS 13-1

JS 10-1JS 6A-1

JS 31A-1 KE-1

Poleng Field

Camar Field

KE-17KE-2

KE-23KE-8KE-9

KE-7

JS 20-2

JS 19W-1

JS 20-3

AROSBAYA-1

JS 33A-1

KETAPANG-1

JS 14A-1

JS 13A-1

GUGUL

PAMOROH

KONANG-1

KONANG-2

LERPAK TANJUNG

KECODUR & W. KECODURDUKO

SUMBERLANTUNG

DURBUK

XX-1

MS-1-1

CAMPLONG-1

PAKAAN-1

RANCAK-1

GIGIR-1

PRANCAK

KERTENGENEH

MANDALABUJUR

CASSIOPEIA-1

PASIAN-1

MADURA

113°00'E 114°00E

7

°

0

0

'

6

°

3

0

'

S

112°30'E 113°30'E

0

KM

2510

JS 1-1

JS 1-2 / CAMAR-2

BUNKU-1

JS 1-3

KE-5

KE-12KE-6

Ujung Pangkah-1KE-2 Field

KE-5 Field

BD-1

BD-2

JS-18-1

KE-4

Payang-1

JS-2-1 JS-3-1

KETAPANG BLOCK

SERGANG-1

JS-19-1

JS-44-1

Bukit Tua-1

Bukit Panjang-1

JS-8-1 Perawan-1

Jenggolo-1

LamonganPEGAT-2

KUJUNG-1

EAST JAVA

KUTI

KE 11-AKRUKA

Gresik

NGIMBANG-1 BOGOMIRING

LIDAH

LINGSIR SEPAT-1 (LIS-1)

GRIGIS BARAT-1

GONDANG-1

NGASIN-1

SURABAYA

METATU

SEPAT

PETIKEN

SEKARKORONG

Tambak Boyo-1 Sidayu-1

22ST1

3

N O R T

H M A D

U R A P

L A T F

O R M

MW-1

MBD-1

CD-1

MS 2-1A

MS 2-1

KALIMANTAN

J A V A

SULAWESI

SINGAPORE

PHILIPPINES

BALI

P A C I F I C

O C E A NPHILIPPINES

INDONESIA

Jakar ta

1000 KMS.

0°

06°S

12°S

IRIAN JAYA

06°N

106°E 112°E 118°E 130°E 136°E

P

A

P

U

A

124°E

BRUNEI

SARAWAK

SABAH

SOUTH CHINA SEA

J A V A S E A

ARAFURA SEA

SULAWESI SEA

B A N D A S E A

I N D I A N O C E A N

E. JAVA BASIN

LOCATION

AREA

ANYER

WALUKU-1



M

Y

AGE/SERIES

Stratigraphy of the

East Java Basin

L

a

t

e

L

A

T

A

T

L

A

E

A

M

I

M

I

E

a

r

A

I

D

D

0

1

5

10

15

20

30

Ledok

Madura Strait/Onshore East Java / Madura Offshore, East Java Sea

Platten Lst

carbonate platform and reefs

Rancak Lst.

Karren

clastics and volcaniclastics

V

MAIN

PHASES

KUJUNG CYCLE

TUBAN & NGRAYONG

CYCLES.

Renewed clastic deposition ;

widespread quartz sandoccurs across East Java

WONOCOLO CYCLES

Widespread deep marinemarl with minor sands.

BDTrend

KerekVolcaniclastics

K

A

L

I

B

E

Gulf Resources (Ketapang) Ltd

Figure 2

V

VV

V

V

Wonocolo Formation

Ngrayong Formation

Tuban Formation

Prupuh - Kujung Unit I

chalky lst.

Kujung Unit II

Ku jung Uni t I I I

Kujung Formation

l

LATE MIOCENE - RECENT

Beginning 7 MYBP,local tectonic events controlfacies development. From latestPliocene, modern volcanic arc

contributes huge quantities of feldspathic / lithic sand.

Initial regressive phasedeposits clastics, then a major trangressive and carbonaterich phase as regional

subsidence continues.

PLEISTOCENE

P

L

I

O

C

E

N



Vol. 1 - 717FIGURE 3 - Location of Seismic Data and Well Control for the Ketapang PSC.

KETAPANG BLOCK

113 °12' 00" E 113 °24' 00" E 113 °36' 00" E 113 °48' 00" E

6

6

6

JS-2-1

KE- 4

JS-44A-1

JS-8-1PERAWAN-1

SERGANG-1

JS-3-1

JENGGOLO-1

JS-19-1

PAYANG-1

BUKIT TUA-1

BUKIT PANJANG-1

740000 760000 780000 800000

9

2

4

0

9

2

6

0

0

0

0

9

2

8

0

0

0

0

MADURA ISLAND

113 °00' 00" E

JS-14A-1

PASIAN-1

CASSIOPEIA-1JS-33A-1

KETAPANG-1Camar-3

Camar-4Camar-1

JS-1-1

KE-2A-6

JS-19W-1KE-2A-5

KE-2B-1

JS-20-3

KE-23

9

3

0

0

0

0

0

6

F

i

g

1999 VINTAGE

PRE 1999 VINTAGES

0 10

KM.

N



Vol. 1 - 718

FIGURE 4 - Regional Tectonic Setting for the East Java Basin.

B D S O U T

H H - G R

A B E N

0 50

Kilometers

100

111°00 E 109°00 E

7

°

0

0

5

°

0

0

3

°

0

0

9

°

0

0

JAVA

KARIMUNJAWA ISL.

: HIGH AREA

: INTERMEDIATE AREA

: LOW AREA

: RECENT VOLCANIC ARC

LEGEND :

113°00 E 115°00 E 117°00 E 119°00 E

PASIRBASIN

B A R I T O

S H E L F

P A T E R N O S T E R

H I G H

S E B U K U

S H E L F

M E R A

T U S

B A R I T O

B A S I N

R I D G E

A S E M

- A S E M

B A S I N

LAUTISL.

KALIMANTAN SULAWESI

SOUTHMAKASSAR

BASIN

M A K A S S A R H A L F G

R A B E N

M U R I A

H T R O U G H

F L O

R E N C E T R O U G H

W E

S T

BAWEAN ISL.

E A S T

C E P U

H I G H

M A D U R A

B A S I N

C D H - G R

A B E N

B A S I N

W E S T

C E P

U H I

G H

D O A N G

T R

O U G H

S A L A Y

A R

B A S I N

H I G H

2 0 0 0

m

FLORESBASIN

S I B A R U

H I G H

P U L A U

L A U T

R I D G E

P A G E R U

N G A N

H A L F G

R A B E N

LOMBOK BASIN

J S - 5 T R O U G H

M A S A L I M A T R O U G H

M A S

A L I M

A

M D A H - G

R A B E N

B D R I D G E

PO RO NG H A LF

G R A B E N

NORTHERN PLATFORM

N O R T H M

A D U R

A H I G H

KETAPANGBLOCK

CARBONATE

PLATFORM

C E N T R A L B AS

I N

N G I M B A

N G

J S - 1 R I D G E

J S - 1 T R O

U G H

B A W E

A N A R C H

T U B A

N T R

O U G H

T R O U G H

F L O R E

N C E

E A S T

K A R I M

U N J A W A

A R C H

S U N D

A - L A N

D

SOUTHERN B ASIN

CENTRAL HIGH

SOUTH HIGH

F

i

A D A N G F A U L T Z O N E

C E N T R

A L D E E

P

MADURA



Vol. 1 - 719

FIGURE 5 - Distribution of Ma or Litholo ies in re-Tertiar basement East Java Basin.

MBD-1

CD-1

MS2-1AMS2-1

Tuban

Bojonegoro

Lamongan

Mojokerto

Ngawi

Blora

AROSBAYA-1NGRAYONG

BANYUBANG

BANYUASINLEDOK

DANDANGILO

NGIMBANG-1

DERMAWU-1

MUDI-1

KLUWEH(gas)

WONOCOLO,KAWENGAN,NGUDAL, &KINDANGAN

METES

LUSIPETAK

KEDINDING

BALUN-TOBO

SEMANGGI NGLOBO

DANDER-1

BODJONEGORO-1

PEGAT-2

KUJUNG-1

KEMBANG BARU-1

KEMBANG BARU-2

WUNUT-1

KE11-G

PETIKEN

METATU

SEKARKORONG

BOGOMIRING

LIDAH

GUGUL

PAMOROH

KRUKA

KUTI

LINGSIRSEPAT-1(LIS-1)

KONANG-1KONANG-2

PORONG-1

GRIGIS BARAT-1

GONDANG-1

NGASIN-1

SEPAT

LERPAK TANJUNG

KECODUR & W. KECODUR

DUKO

SUMBERLANTUNG

DURBUK

KE 11-C

KE11-E

BD-1

XX-1

BD-2

MS-1-1

CAMPLONG-1

PAKAAN-1

RANCAK-1

GIGIR-1

KE11-A

PRANCAK

KERTENGENEH

MANDALABUJUR

0 5025

KM

JAVA

MADURA

KETAPANG BLOCK

SURABAYA

7

°

0

0

S

114°00E

Tuffaceous Ss.

Slate

RhyodacitesSlate

F

i

g

TUBAN-1

JENU-1

JS28-1

KUTILANG-1

JS13-1

JS10-1JS6A-1

KE-5JS-20/Poleng Field

KE-17UJUNG PANGKAH-1

KE-2

KE-23KE-8

KE-9

KE-7

JS20-2

JS19W-1

JS13A-1

PLATUNGAN

TAWUN GEGUNUNG

JATIROGO-1

BLIMBING-1

112°00E

6

°

0

0

S

Quartzite

Phyllite + Ss.

Px-Basalts

Metashale + Siltstone

Phyllite

Phyllite

JS 2-1

JS33A-1

KETAPANG-1

MONTOR-1

JS14A-1

CASSIOPEIA-1

PASIAN-1

MetaSiltstone

Gabbro

Diabase

Meta-tuff+lava

Meta-Sediments

JS31A-1

KE-6

KE-1

KE-12 JS20-3

KE-4

JS1-1

JS1-2/ CAMAR-2

113°00E

Basalt

Ande sit e

Basic Igneous

PAYANG-1

JS 8-1

JS 44A-1

PERAWAN-1

SERGANG-1MonzoniteVitr ic Tuff

Diorite

BUKIT PANJANG-1

JS 19A-1

BUKIT TUA-1JENGGOLO-1

JS 3-1

Meta-greywacke

: Acidic Igneous Rocks

: Intermediate Igneous Rocks

: Basic Igneous Rocks

LEGEND :

: Low Grade Metamorphic Rocks



FIGURE 6 - Interpreted Paleogeography during deposition of the upper Ngimbang Formation

(Late Oligocene) in the East Java Basin.



FIGURE 8 - Maturation Model for Hydrocarbon Source Rocks in the Central Deep of the East Java

Basin. The geothermal gradient is assumed to be 1.80 degrees F per 100 feet.

CENTRAL DEEP MATURATION MODEL

Age

D

ept

h

0

500

1000

1500

2000

2500 5

5

4

3

2

1

0

t = 0

Basement L. Ngimbang Type I/II U. Ngimbang Type II/III

Kujung

Kujung

Kujung

Tuban Ngrayong Wonocol Pliocene Pleistocene

Mature0.7 to

Peak Generation1 to 1.3

Main Gas1.3 to 2.6

GG. 1.8 F/100'

MADURA STRAITS MATURATION MODEL

GG. 1.51 F/100'



FIGURE 10 - Interpreted Distribution of Hydrocarbon Kitchen Areas and Migration Pathways

for the North Madura Platform Area of the East Java Basin.



Vol. 1 - 723FIGURE 12 - Top Wonocolo Time Structure Map. Note prominent north-south trending channels.

Seismic line segment located in west center area is shown in Figure 13.

0 10

KM.

N

MADURA ISLAND

4

8

0

5 6 0

720

6 4 0

5

6 0

4 0 0

8 0

1 6 0

480 5

6

0

5

6

0

6 4 0

1040

1 1 2 0

7 2 0

4 0 0

3 2 0

6 40

7

2

0

560

7 2 0

80 0

8

0

0

4 8 0

4 0 0

3 2 0

540

113° 12' E 113° 24' E 113° 36' E 113° 48' E

6

°

6

°

6

°

C.I. 20 ms

JENGGOLO-1 BUKIT TUA-1

PAYANG-1

BUKIT PANJANG-1

JS - 44A - 1

JS - 8A - 1 PERAWAN-1

JS - 19 - 1

JS - 2 - 1 JS - 3 - 1

SERGANG-1

KE - 4

KETAPANG BLOCK

9

2

8

0

9

2

6

0

9

2

4

0

740 000 760 000 780 000 800 000

S E I S M I

C L I N E

F

i

g

u

CHANNELS

CHANNELS



Vol. 1 - 724

FIGURE 13 - Seismic Line Segment from the west central part of the Ketapang PSC. Note prominent Wonocolo channel in the center of

the line at about 500 ms., causing sag in deeper horizons. Line segment is located on Figures 12, 14, and 15.

99GKT- 023

T i m e

2.5 KMSW NE

F

i

g

Top Wonocolo

Top Ngrayong

Intra- Tuban

Top Basement

Top Kujung III

Top Kujung II

Top Kujung I

Top Rancak

CHANNEL



Vol. 1 - 725

FIGURE 14 - Uncorrected Time Structure Map for Intra-Tuban Horizon. Note presence of sag caused by shallower

Wonocolo topography. Seismic line segment located in west center area is shown in Figure 13.

F

i

g

u

1 1 0 0

1 1 0 0

1 1 0 0

1 1 0 0 1

2 0 0

1 1 0 0

1 0 0 0

8 0 0

7 0 0

1 0 0 0

11 0 0

1 1 0 0

10 0 0

1

1

0

0

1 1 0 0

1

1

0

0

1 0 0 0

9 0 0

8 0 08

0 0

7 0 0

8 0 0

9 0 0

1 0 0 0

1 1 0 0

1 1 0 0

11 0 0

1 1 0 0

1000

9 0 0

9 0 0

1 2 0 0

1200

1 1 0 0

1 0 0 0

800

6 0 0

7005 0 0 6

0 0

7 0 0

7 0 0

6 0 0

6 0 0

5 0 0

7 0 0

1 1 0 0

1 3 0 0

1200

1 4 0 0

1600

1 1 0 0

1 8 0 0

1 8 0 0

1 6 0 0

1 4 0 0

1 2 0 0

1 2 0 0

1 3 0 0

1200

1 0 4 0

1

0 4

0

1

0

4

0


PAYANG-1

BUKIT PANJANG-1

JS - 44A - 1


SERGANG-1

KE - 4

JS - 19 - 1

JS - 2 - 1

JS - 3 - 1

9

2

8

0

9

2

6

0

9

2

4

0

740 000 760 000 780 000 800 000

0 10

KM.

N

C.I. 20 ms

113° 12' E 113° 24' E 113° 36' E 113° 48' E

6

°

6

°

6

°

KETAPANG BLOCK

S E I S

M I C L I N

E

7

0

0

AREA OF SAG



Vol. 1 - 726

FIGURE 15 - Corrected Time Structure Map for Intra-Tuban Horizon. Wonocolo topography is no longer

recognizable. Seismic line segment located in west center area is shown in Figure 13.

1000

1000

9 0 0

9 0 0

1 1 0 0

1 2

0 0

1 1 0 0

1 2

0 0

1 3 0 0

1 2 0 0

800

6 0 0

1 0 0 0

7 0 0 7

0

0

1 1 0 0

1 1 0 0

1 4 0 0

1 2 0 0

1 6 0 0

1 4 0 0

1 6 0 0

1 4 0 0

7 0 0

6 0 0

8 0 0

8 0 0

7 0 0

4 0 0

7 0 0 6 0 0

5 0 0

9 0 0 1 0 0 0

1 0 0 0

9 0 0

7

0

0

6 0 0

5 0 0

4 0 0

10 0 0

5 0 0

5 0 0

6 0 0

8 0 0

1 0 0 0

5 0 0

5 0 0

5 0 0

4 0 0

6 0 0

700

8 0 0

1 0 0 0

1

1

0

0

1 1 0 0

1 2 0 0 1 1 0 0

1 1 0 0 1

1

0

0

9 0 0

10 0 0

1 0 0 0

9 0 0

1 1 0 0 1 1 0 0

1 0 0 0

9 0 0

1 1 0 0

1 1 0 0


PAYANG-1

BUKIT PANJANG-1

JS - 44A - 1


SERGANG-1

KE - 4

JS - 19 - 1

JS - 2 - 1

JS - 3 - 1

9

2

8

0

9

2

6

0

9

2

4

0

740 000 760 000 780 000 800 000

0 10

KM.

N

C.I. 20 ms

113° 12' E 113° 24' E 113° 36' E 113° 48' E

6

°

6

°

6

°

KETAPANG BLOCK

MADURA ISLAND

S E I S M I

C L I N E

F

i

g

u

1 8 0 0

77606055 Eksploration of Th NOrth Madura Platform

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Transcript of 77606055 Eksploration of Th NOrth Madura Platform