Dorado. An overview of the largest oil discovery on the NW shelf in the last 30 years
Ian CockerillHead of Geoscience
Top global conventional discoveries of 2018 / 2019
W Messoyakha187 Mmboe
Triton200 Mmboe
N Obskoye935 Mmboe
Hades / Idris191 Mmboe
Calypso672 Mmboe
Guyana Discoveries2071 Mmboe
Guanxuma130 Mmboe
Dover183 Mmboe
Ballymore546 Mmboe
Mabrouk NE671 Mmboe
Dorado283 Mmboe
Brulpadda1000 Mmboe
KBD-2X333 Mmboe
A neglected bit in the middle
1000km1000km1000km
Dorado
Browse
NorthCarnarvon
Bedout Sub-basin
Dorado
500km
And an unfashionable bit of stratigraphy
Roebuck Basin stratigraphy(Geoscience Australia)
Bedout Sub-basin stratigraphy (Minken et al 2018)
HOVE UNCONFORMITY
Australian North West Shelf big hitting plays
Mungaroo
North Rankin
Plover
Brewster
Barrow
DoradoRocPhoenix South
PhoenixPhoenix South
DoradoRoc
Phoenix South
Lower Keraudren
Bedout hydrocarbon occurrences
Bedout High wells – Permian volcanic centre.
Keraudren-1 – Middle Triassic ‘Keraudren Formation’ with excellent quality reservoir.
Poissonnier-1 and Bruce-1 – Triassic oil shows on the basin bounding fault system.
Bedout exploration history - 1970’s
1980 1990 2000 2010
1970’sBase Triassic depth structure map (m)
50kmLAMBERT SHELF
Poissonnier 1
Bruce 1
BEDOUT HIGH
BEAGLESUB-BASIN
BEDOUTSUB-BASIN
Keraudren 1
Depuch 1
Picard 1
Minilya 1 Bedout 1
BP Phoenix discoveries. Interpreted as tight gas in a distal deltaic setting.
Bedout exploration history - Early 1980’s
1980 1990 2000 2010
Early 1980’sBase Triassic depth structure map (m)
50kmLAMBERT SHELF
Poissonnier 1
Bruce 1
BEDOUT HIGH
BEAGLESUB-BASIN
BEDOUTSUB-BASIN
Keraudren 1North Turtle 1
Depuch 1
Picard 1
Phoenix 2
Phoenix 1
Minilya 1 Lagrange 1Bedout 1
Early 1980’s
1980 1990 2000 2010
Base Triassic depth structure map (m)
50km
Increasing condensate with depth.Potential for deeper liquids?
Bedout exploration history - Early 1980’s
LAMBERT SHELF
Poissonnier 1
Bruce 1
BEDOUT HIGH
BEAGLESUB-BASIN
BEDOUTSUB-BASIN
Keraudren 1North Turtle 1
Depuch 1
Picard 1
Phoenix 2
Phoenix 1
Minilya 1 Lagrange 1Bedout 1
Early 1990’sBeagle Sub-basin Jurassic exploration.
Nebo Oxfordian Calypso Formation oil discovery.
Bedout exploration history - Early 1990’s
1980 1990 2000 2010
LAMBERT SHELF
Base Triassic depth structure map (m)
50km
Poissonnier 1
Bruce 1
BEDOUT HIGH
BEAGLESUB-BASIN
BEDOUTSUB-BASIN
Keraudren 1North Turtle 1
Depuch 1
Picard 1
Phoenix 2
Phoenix 1
Minilya 1 Lagrange 1Bedout 1
Darwin 1
Cimba 1
Nebo 1Halo 1
Huascaran 1
BeagleMC3D
Recoverable Oil 12 MMbbls (2C)
Bedout Sub-basin acreage awarded to Carnarvon/Finder in the 2008 area release after a 30 year gap in Bedout Sub-basin exploration!
Phoenix 3D acquired.Apache / JX farmed in for two wells.
2014 - Oil discovered at Phoenix South-1 in the Barret sandstones.
2015 – Gas-condensate discovered at Roc-1 in the Caley sandstones.
Phoenix wells reinterpreted as oil.
Bedout exploration history - Mid 2010’s
1980 1990 2000 2010
LAMBERT SHELF
Base Triassic depth structure map (m)
50km
Mid 2010’sBEDOUT HIGH
BEAGLESUB-BASIN
BEDOUTSUB-BASIN
Base Triassic depth structure map (m)
Keraudren 1
Poissonnier 1
Bruce 1
North Turtle 1
Depuch 1
Picard 1
Phoenix 2
Phoenix 1
Minilya 1 Lagrange 1Bedout 1
Roc 1
Phoenix South 1
Darwin 1
Cimba 1
Nebo 1Halo 1
Huascaran 1
BeagleMC3D
Polly3D
ZeesterMC3D
Phoenix3D
2015 onwardsCapreolus multi-client 3D acquired.
Roc-2 appraisal well confirms high quality reservoir in the Caley and excellent quality seal in the overlying Hove.
Phoenix South-2 and -3 appraisal wells(tight reservoir).
Dorado Canyon identified up-dip of Roc as a potential trapping mechanism at Dorado.
Bedout exploration history - 2015 onwards
1980 1990 2000 2010
BEDOUT HIGH
BEAGLESUB-BASIN
BEDOUTSUB-BASIN
LAMBERT SHELF
Base Triassic depth structure map (m)
50km
Keraudren 1
Poissonnier 1
Bruce 1
North Turtle 1
Depuch 1
Picard 1
Phoenix 2
Phoenix 1
Minilya 1 Lagrange 1Bedout 1
Dorado 1
Roc 1
Roc 2
Phoenix South 1Phoenix South 2
Phoenix South 3
Darwin 1
Cimba 1
Nebo 1Halo 1
Huascaran 1
BeagleMC3D
Polly3D
CapreolusMC3D
ZeesterMC3D
Phoenix3D
DORADOCANYON
2018 Dorado discovery.
Lower Keraudren Delta – oil and gas accumulations
Roc-1 Roc-2 Dorado-1Phoenix South
DORADOCANYON
-2-3
Reported oil and gas occurrences
Oil
Condensate
Gas
-1
HOVE
CALEY
BARRET
HUXLEY
MILNE
CRESPIN
BAXTER
CALEY
MILNE
CALEY
N S
Image courtesy of TGS, Santos, and Carnarvon Petroleum
Dorado-1
132m total net pay13-20%porosity
Image courtesy of TGS, Santos, and Carnarvon Petroleum
Caley Member 96.1m gross79.6m net
2019
Bedout 2019 activity
1980 1990 2000 2010
BEDOUT HIGH
BEAGLESUB-BASIN
BEDOUTSUB-BASIN
LAMBERT SHELF
Base Triassic depth structure map (m)
50km
Keraudren 1
Poissonnier 1
Bruce 1
North Turtle 1
Depuch 1
Picard 1
Phoenix 2
Phoenix 1
Minilya 1 Lagrange 1Bedout 1
Dorado 1
Roc 1
Roc 2
Phoenix South 1Phoenix South 2
Phoenix South 3
Darwin 1
Cimba 1
Nebo 1Halo 1
Huascaran 1
BeagleMC3D
Polly3D
CapreolusMC3D
ZeesterMC3D
Phoenix3D
DORADOCANYON
Dorado 2Dorado 3 Roc South 1
Keraudren3D
Dorado-2 and Dorado-3 appraisal wells.
Roc South-1 exploration well.
Keraudren 3D seismic survey.
Caley Member (Roc-2 core)
Roc-2 chemostratigraphy (Minken et al 2018)
• Distributary channel sandbars and restricted lagoonal facies indicative of a deltaic environment.
• Good quality source rock interbedded within the Caley reservoir, thermally mature at the present day.
• Hove is a marine transgressive shale.
Roc-2 Caley core Roc-2 Caley core
HOVE UNCONFORMITY
Caley palaeogeography interpretation
100km
Comparison of Capreolus 3D to legacy 2D data over Dorado
2.0
3.0
Dorado gas chimney?
AttributeDoradoCanyon
Perth Canyon
Canyon length 120 km 145 km
Canyon width (at the shelf break) 15 km 16 km
Water depth at the shelf break (canyon shoulder)
(500 m> estimated)
850m
Water depth at the shelf break(canyon bottom)
(1500 m> estimated)
2300 m
Canyon incision depth(1000 m>
estimated)1450 m
Analogues to the Dorado Canyon
Perth Canyon
Dorado(analogous
location)
Dorado-1 Roc-1 Roc-2
Roc Southprospect
NNW 5km
Dorado Canyon
20km
The Dorado Canyon and the Caley shelf edge
Base Triassic depth structure map (m)
50km
Keraudren 1
Poissonnier 1Bruce 1
North Turtle 1
Depuch 1
Picard 1
Phoenix 2
Phoenix 1
Dorado 1
Roc 1 Roc 2
Phoenix South 1Phoenix South 2
Phoenix South 3
Darwin 1
Cimba 1
Nebo 1Halo 1
Huascaran 1
Dorado Canyon
Caley shelf edge eroded at the Caley-Hove unconformity
Caley shelfprospects
Base Triassic
Transgressive Hove shale
Caley-Hoveunconformity
NESW
Caley shelf edge eroded at the Caley-Hove unconformity
Dorado Canyon PlayW18-4 Caley
shelf prospects
So where next?W18-4 Caleyshelf prospects
Girt by undrilled sedimentary section
Total depth ofsection drilled
NWS Inset Map
Cross Section across AustraliaLeft side Right side
Total depth ofsection drilled
Depth to Proterozoic Basement
Depth (m)
1000km
500km
Girt by undrilled sedimentary section
NWS Inset Map
Cross Section across AustraliaLeft side Right side
Depth to Proterozoic Basement
Total depth ofsection drilled
Isopach of undrilled section
Dorado283 Mmboe (2C)2
(Depth ~4000 m)
Dorado283 Mmboe (2C)2
(Depth ~4000 m)
Isopach (m)
Isopach of undrilled section
Isopach (m)
1000km
1 - AWE ASX announcement 21st February 20182 - CVN ASX announcement 20th August 2018
Waitsia1339 BScf GIIP (P50)1
(Depth ~3200 m)
Girt by undrilled sedimentary section
‘Australia is a country that is at once staggeringly empty and yet
packed with stuff. Interesting stuff, ancient stuff, stuff not readily
explained. Stuff yet to be found’
Isopach (m)
Isopach of undrilled section
Bill Bryson, In a Sunburned Country
1000km
Dorado283 Mmboe (2C)2
(Depth ~4000 m)
1 - AWE ASX announcement 21st February 20182 - CVN ASX announcement 20th August 2018
Waitsia1339 BScf GIIP (P50)1
(Depth ~3200 m)
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