Overview of Australia’s 2015 Offshore Acreage Release for ... · Australia's 2015 Offshore...

Overview of Australia’s

2015 Offshore Acreage Release for Petroleum Exploration

Dr Tom Bernecker

Leader, Acreage Release and Petroleum Promotion

Resources Division, Geoscience Australia

Australia's 2015 Offshore Acreage Release



Petrel Sub-basin

• Existing gas production, further development planned

• Shallow water exploration (< 100 metres)

• Bids received for W14-1

• Work program bidding: NT15-1

• Cash bidding: NT15-2; W15-1

Closing Date:29 Oct 2015

Cash Bidding :4 Feb 2016


SW-NE seismic section across Petrel Sub-basin

source kitchen ??Migration

Reservoirquality

Structures


Schematic W-E cross-section across Turtle/Barnett fields

• Reservoir facies:

• Marginal marine, fluvial, glacial (Lower Permian)

• Open marine, shelfal (middle Carboniferous)

• Small stacked accumulations (<10 MMbbl), low poro/perm)

• Source rocks:

• Anoxic marine mudstones (Upper Devonian –Lower Carb.)

• Marine, calcareous mudstones (Devonian)

• Unproven Ordovician sources?


Sahul Syncline (W15-2) and Vulcan Sub-basin (AC15-1 & AC15-2)work program

• Sahul Syncline (W15-2):

• Shallow water depths (<50-300 m)

• Flanks Jurassic depocentre with oil- and gas-prone source rocks

• Relatively underexplored

• Source rock heterogeneity, reservoir quality are main uncertainties

• Vulcan Sub-basin (AC15-1 & AC15-2):

• Proven oil and gas province

• Complex structural evolution

• Multiple episodes of fault reactivation have impacted on seal integrity.

• Biodegradation of trapped hydrocarbons recorded



NW-SE seismic section across Vulcan Sub-basin

Source rocksReservoirs



Browse Basin

• Proven gas, condensate and oil province

• Production infrastructure in progress

• Ichthys pipeline (Inpex/Total)

• Prelude FLNG (Shell/Inpex)

• On track to deliver first volumes in 2016

• Ongoing diverse exploration activity

: Petroleum Systems, Shows Distribution

Westralian 1 + 2JurassicPlover + Lower Vulcan

Westralian 1 + 2Jurassic – Early CretaceousPlover + Vulcan (thick)

Westralian 1Early – Middle JurassicPlover

Westralian 3Early CretaceousEchuca Shoals


Caswell Sub-basin & Yampi Shelf (work program)


Closing Date:21 April 2016

AC15-3W15-18

W15-3W15-4

Permit awarded:Murphy Oil and MitsuiPermit awarded:Murphy Oil and Mitsui

Permit awarded:Santos and InpexPermit awarded:Santos and Inpex

APPEA 2015_Offshore Acreage Release_dryrun

NW-SE seismic section from Caswell Sub-basin to Yampi Shelf

3 petroleum systems

updip migration

stratigraphic traps: Gwydion, Cornea




Phoenix-South

Woodside/Shell JV

Roebuck Basin, W15-5 (work program)

• Target: Triassic gas

• Result: Triassic oil

• Estimated 300 MMbbl in place

• Recoverable: ~70–80 MMbbl ???????? (~ 31 MMbbl according to DeGolyer & McNaugton, 6-5-15)

• Suboptimal reservoir characteristics

• New source rock interval (Early Triassic)?

• De-risking of other drilling programs (!)

Phoenix-South:



NW-SE seismic section across Roebuck Basin

Source rocks

NW SE

mature

Phoenix area

over-mature ?Facies:nearshore, restricted ?

Facies:deep marine, sandy ?

North Turtle Hinge Zone

W15-5

mature?

SR maturity

Reservoir quality

SR facies

Migrtn. pathways

Reservoir quality

Migrtn. pathways

SR maturity

SR facies



Northern Carnarvon Basin

• Australia’s premier hydrocarbon province

• New discoveries

• Gorgon to come online

• Production from Coniston commenced

• Shallow water areas provide access to oil and gas accumulations

• Deep water areas represent high risk/high reward frontier potential

• Early Triassic may offer new plays


Dampier Sub-basin

• Mainly shallow water

• Access to liquid petroleum system

• Possible presence of Early Triassic source rocks?

W15-6, W15-7 & W15-8:Work program

• Complete 3D seismic coverage

• Access to 3 petroleum systems

• Surrounded by infrastructure

• Elk gas field and Chamois oil field in W15-11 and W15-12

W15-9, W15-10, W15-11 & W15-12: cash bidding


Cash Bidding :4 Feb 2016


Permit awarded:Apache

Permit awarded:Apache

Permit awarded:Tap Oil

Permit awarded:Tap Oil

• Shallow to deep water (80-1,200 m)

• Three areas adjacent to gas fields,

• One large underexplored area

• Opportunities to test new play types

W15-13, W15-14, W15-16 & W15-17: Work program

Bids receivedBids received

Exmouth Plateau



W15-13W15-16W15-17

W15-14


Round 2, 2014:Bids received Current Permit 2015 Release Areas

Southern margin activities and opportunities

BP/Statoil: 4 wells in primary term

Chevron: 4 wells in primary term

Murphy Oil/Santos:1 well in secondary term

Bight Petroleum:1 well in primary term

Liberty Petroleum:2 wells in primary term

Origin: new gas discovery at Speculant-1


Bight Basin, S15-1 (work program)

• Last remaining open acreage in Ceduna Sub-basin

• Offshore frontier, deep water (150 – 2,000 m)

• Limited well control, gas show in Greenly-1, well commitments in adjacent areas

• new seismic data required

S15-1: (work program) Closing Date:21 April 2016


SW-NE seismic section across S15-1

Thick Upper Cretaceous section(including volcanics)

Early rift half-grabenUpper Jurassic-Lower Cretaceous

(may include fluvio-lacustrine sediments)



Otway Basin (V15-1, T15-1 & T15-2); Northern Sorell Basin (T15-3)(work program)

• Outboard from producing gas province

• Deep water frontier (240 – 3,400 m)

• Limited well control, dry wells Hill-1, Somerset-1 and Amrit-1

Nelson Sub-basin: V15-1, T15-1 & T15-2

• Rank frontier

• Water depths (100 – 3,200 m)

• 6 km of basin fill, including coaly sediments which are considered mature for hydrocarbon generation

Northern Sorell Basin: T15-3


Eastern Otway Basin

Tw

o-w

ay time (s)

4

8

12

0SW NE

Nelson Sub-basinMussel

PlatformShipwreck

Trough

50 km

137-09


Thick Upper Cretaceous section

Austral 2 (Eumeralla)Lower Cretaceouscoaly, floodplain, marginal marine

Possible Austral 3marine

(Turonian)



Gippsland Basin (V15-2 & V15-3)

• Located in a world class producing petroleum province

• Shallow to ultra-deep water depths (80–3,000 m)

• New seismic data required

• Under-explored, deep-water part of the basin offers untested plays

• Pisces Sub-basin mirror of northern terrace plays?

• Stratigraphic traps along southern margin ?


SW-NE seismic section across eastern Gippsland Basin

Source rocks?

Marine ?Lacustrine ?Lower coastal plain ?Marine sandstones

New seismic data acquired on southern flank of Gippsland Basin


The 2015 Acreage Release is supported by:

Web-based detailed information (www.petroleum-acreage.gov.au)


Supplementary compilation of relevant GA-publications, including updated stratigraphic charts (USB)

Selected data sets on NOPIMS (rapidly expanding)

Geoscience Australia’s client services: [email protected]


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