AUSTRALIA 2013Offshore Petroleum Exploration Acreage Release

RELEASE AREAS NT13-4 AND NT13-5 SOUTHERN PETREL SUB-BASIN, BONAPARTE BASIN NORTHERN TERRITORY

Figure 1 Location of the 2013 Release Areas in the Petrel Sub-basin of the Bonaparte Basin

HIGHLIGHTS

BIDS CLOSE – 21 November 2013• Proximal to the Blacktip gas fields and

Blacktip pipeline

• Development/production plans are underway for the nearby Petrel, Tern and Frigate gas fields

• Shallow water depths, 10–90 m

• Proven plays in anticlines, tilted fault blocks and structural/stratigraphic traps, structures related to salt tectonics

• Multiple potential oil- and gas-prone source rocks and active petroleum systems within the region

• Special Notices apply, refer to Guidance Notes

Release Areas NT13-4 and NT13-5 are located in the Joseph Bonaparte Gulf, in the vicinity of the Petrel, Tern, Frigate and Blacktip gas fields; the latter commenced production via the Blacktip pipeline in 2009.

The Petrel Sub-basin in the southern Bonaparte Basin was formed during Paleozoic northeast–southwest extension and contains a thick succession of Paleozoic and Mesozoic sediments. Proven Permian petroleum systems in the region have charged the numerous gas accumulations. There is an oil and gas-prone early Carboniferous petroleum system, with Bonaparte Formation (Langfield Group) source rocks, in the inboard part of the sub-basin. The Release Areas offer a range of play types including early formed structures such as horst blocks and rotated fault blocks, as well as inversion-related anticlines. Stratigraphic traps are represented by pinch-outs and truncations across unconformities. Infrastructure in the region is expanding and will facilitate development of any new discovery.

AUSTRALIA 2013 Offshore Petroleum Exploration Acreage Release 1

WESTERNAUSTRALIA

NORTHERNTERRITORY

SOUTHAUSTRALIA

QUEENSLAND

NEWSOUTHWALES

VICTORIA

TASMANIA

Areas NT13-4 & 5Bonaparte Basin

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Figure 2 Structural elements of the Petrel Sub-basin (after Colwell and Kennard, 1996) showing petroleum fields and discoveries, the location of regional cross-sections and the 2013 Release Areas

WESTERNAUSTRALIA

NORTHERNTERRITORY

NTWA

Cape Ford 1

Blacktip pipeline

Bayu/Undan pipeline

Ichthys pipeline (proposed)

Figure 4

Figure 5

Malita Graben

Darwin ShelfPetrel Sub-basin

BerkleyPlatform

MoylePlatform

CarltonSub-basin

Keep InletSub-basin

Kimberly Block

Halls

Cre

ek -

Fitzm

auric

e

Mob

ile Z

one

NBF-1002

SahulSyncline

LondonderryHigh NT13-4

NT13-5

NT13-3

NT13-2

Petrel

TernFrigate

Blacktip

Gull 1

Newby 1

Marsi 1

Weasel 1

Turtle 1

Curlew 1

Sunbird 1Sandbar 1

Penguin 1

Matilda 1

Lesueur 1

Kinmore 1

Barnett 1, 2Windjana 1

Sidestep 1

Lacrosse 1

Flat Top 1

Fishburn 1

Durville 1Darwinia 1

Sandpiper 1

Laperouse 1

Jacaranda 1

Cambridge 1

Billawock 1

Kingfisher 1

Shakespeare 1

Bougainville 1Blacktip North 1Marina 1

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WA

NT

SA

QLD

NSW

VIC

TAS

Well symbol information is sourced either from "open file" data from titleholders where this is publicly available as at 1 December 2012 or from other public sources. Field outlines are provided by EncomGPinfo, a Pitney Bowes Software (PBS) Pty Ltd product. Whilst all care is taken in the compilation of the field outlines by PBS, no warranty is provided re the accuracy or completeness of the information, and itis the responsibility of the Customer to ensure, by independent means, that those parts of the information used by it are correct before any reliance is placed on them.

0 100 km

12°

14°

128° 130°

Mineral exploration wellPetroleum exploration well - Oil discovery

Petroleum exploration well - Oil showPetroleum exploration well - Gas discovery

Petroleum exploration well - Gas show

Petroleum exploration well - Not classifiedPetroleum exploration well - Dry wellPetroleum exploration well - Oil and gas showPetroleum exploration well - Gas discovery and oil showPetroleum exploration well - Oil discovery and gas show

Major fault - extensional

Depocentre axis

Hinge

Basin outline

Sub-basin outline

Seismic section figure location

Gas pipeline

Gas pipeline (proposed)

Scheduled area boundary(OPGGSA 2006)

Major fault - strike-slipMesozoic

Paleozoic

Platform/Shelf

Precambrian basement

Salt diapir

2013 Offshore PetroleumAcreage Release Area

Gas field

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Figure 3 Paleozoic stratigraphy and hydrocarbon discoveries of the Petrel Sub-basin based on the Bonaparte Basin Biozonation and Stratigraphy Chart (Nicoll et al, 2009). Geologic Time Scale after Gradstein et al (2012). Basin phases are specific to the Petrel Sub-basin and follow Colwell and Kennard (1996)

260

270

280

290

300

310

320

330

340

350

360

370

380

Age(Ma) Period Epoch Stage Shows Petrel Sub-basin

Seismichorizons

(AGSO, 2001)

Dev

onia

nC

arbo

nife

rous

Perm

ian

Lopingian

Guadalupian

Cisuralian

Pennsylvanian

Mississippian

Late

Givetian

Frasnian

Famennian

Tournaisian

Visean

Serpukhovian

Bashkirian

Moscovian

Kasimovian

Gzhelian

Asselian

Sakmarian

Artinskian

Kungurian

Roadian

Wordian

Capitanian

Wuchiapingian

Changhsingian

Pincombe 1

Bonaparte 1, Weaber 5

Ningbing 2Waggon Creek 1

Cape Ford 1

Cape Ford 1Pelican Island 1

Cape Ford 1Barnett 2, Turtle 2

Lesueur 1

Cape Ford 1

Barnett 2, Turtle 2 Bonaparte 2

Lesueur 1

Bonaparte 1, Turtle 1

Barnett 1, Cape Ford 1, Kulshill 2Pelican Island 1, Turtle 1, Turtle 2

Barnett 1, Cape Ford 1, Turtle 1, Turtle 2

Cambridge 1, Torrens 1

Blacktip 1, Bougainville 1, Tern 2

Petrel 2, Penguin 1, Polkadot 1Turtle 1Petrel 2

Turtle 2

Torrens 1 Tern 2, Tern 3

Ascalon 1A, Tern 3

Fishburn 1

Basinphases

Blacktip 1, Polkadot 1Turtle 2

Barnett 1, Shakespeare 1, Turtle 1Tern 1

Turtle 1Blacktip 1Barnett 1

Torrens 1

Barnett 2

Cape Ford 1Lacrosse 1

Blacktip 1

Middle

Induan

OlenekianEarlyTr

iass

ic

250

AnisianMiddle

Tern 1, Tern 2Tern 4, Tern 5

Bonaparte 1

Ascalon 1A

Ascalon 1A, Petrel 1, Petrel 2, Petrel 3Petrel 4, Petrel 5, Petrel 6, Tern 4

Weaber 1, Weaber 4

Garimala 1, Vienta 1, Waggon Creek 1A

Barnett 1, Barnett 3Cape Ford 1, Kulshill 1

Lacrosse 1, Turtle 1

Bonaparte 1, Garimala 1, Vienta 1

Keep River 1, Ningbing 1Waggon Creek 1A, Weaber 2A

Kingfisher ShaleUtting Calcarenite

Wea

ber G

roup

Kuls

hill

Gro

upKi

nmor

e G

roup

tper

tcar

mcar

lcar

Ther

mal

sub

side

nce

Sandbar Sandstone

Wad

eye

Gro

upLa

ngfie

ld G

roup

Equi

vale

ntN

ingb

ing

Gro

up E

quiv

alen

t

AscalonFormation

Tern Formation

Pearce Formation

Keyling FormationDitji Formation

Quoin FormationTreachery Formation

Coc

kato

o G

roup

Equi

vale

nt

AquitaineFormation

BonaparteFormation

MilligansFormation

BonaparteFormation

BonaparteFormation

SunbirdFormation

ArcoFormation

KuriyippiFormation

Fossil HeadFormation

DombeyFormation

Cape HayFormation

TorrensFormation

Lower CapeLondonderry

Formation

Fishburn Formation

Mairmull FormationPenguin

Formation

TanmurraFormation

Yow CreekFormation

Hyl

and

Bay

Sub-

grou

pM

t Goo

dwin

Sub-

grou

p

ecar

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Figure 4 AGSO seismic line 100/01 across the Petrel Sub-basin (Kennard et al, 2002). Location of the line is shown in Figure 2. Regional seismic horizons are shown in Figure 3

0

2

4

6

8

10

Two-

way

tim

e (s

)

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Base JurassicIntra Triassic

Top Permian

Late Carboniferous

Near Top Carboniferous

Mid CarboniferousEarly Carboniferous

Basement

SW NEBougainville 1Lacrosse 1

Line 100/01

NT13-4NT13-5

0 50 km

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Figure 5 Southeastern part of AGSO seismic line 100/05 across the Petrel Sub-basin (Kennard et al, 2002). Location of the line is shown in Figure 2. Regional seismic horizons are shown in Figure 3

0

2

4

6

8

10

Two-

way

tim

e (s

)

12-6768-5

SENWGull 1 Petrel 1A Bougainville 1

Turonian

CallovianBase Jurassic

Intra Triassic

Top Permian

Near Top Carboniferous

Late Carboniferous

Mid Carboniferous

Basement

NT13-5NT13-4

0 50 km

Line 100-05 (part)

AUSTRALIA 2013 Offshore Petroleum Exploration Acreage Release 6

PETROLEUM SYSTEMS ELEMENTS

Southern Petrel Sub-basin

Sources • Permian (Guadalupian–Lopingian) pro-delta, shoreface and open marine Hyland Bay Subgroup (gas-prone)

• Permian (Cisuralian) fluvial Keyling Formation (gas-prone, possible oil)

• Carboniferous (Mississippian) marine Bonaparte Formation (oil and gas-prone)

Reservoirs • Lower Triassic marginal marine Ascalon Formation (Mount Goodwin Subgroup)

• Permian lacustrine Penguin Formation (Mount Goodwin Subgroup)

• Permian shoreface to marine Tern, Cape Hay and Torrens formations (Hyland Bay Subgroup)

• Permian marginal marine Keyling, fluvial Quoin, and glacial Treachery and Kuriyippi formations (Kulshill Group)

• Carboniferous marine Aquitaine and Arco formations (Wadeye Group)

• Carboniferous marine Tanmurra Formation, Kingfisher Shale, Yow Creek Formation and Milligans Formation (Weaber Group)

Seals Regional seals

• Triassic marine Mount Goodwin Subgroup

• Permian marine Fossil Head and glacial Treachery formationsIntraformational seals

• Permian shoreface to open marine Hyland Bay Subgroup (Pearce, Cape Hay and Dombey formations), glacial Treachery and marginal marine Keyling formations

• Carboniferous marine Weaber Group and marine Langfield Group equivalent

Traps Structural and stratigraphic traps

• Middle–Late Triassic Fitzroy Movement was responsible for creating large-scale inversion anticlines (Petrel) commonly associated with salt mobilisation, faulted anticlines (Tern, Blacktip and Frigate) and tilted fault blocks (Fishburn)

• Drape and pinch-out plays occur within the Weaber Group and lowstand basin-floor fan sandstones within the Milligans Formation in the southern Petrel Basin

INFRASTRUCTURE AND MARKETSThe 2013 Release Areas are proximal to the Petrel and Tern gas fields, the Turtle and Barnett oil fields and the Blacktip gas field and pipeline.

CRITICAL RISKSThe identification of good quality reservoirs in suitably sized traps with access to active oil and gas-prone source kitchens is a risk. Preservation of the oil following significant Triassic-uplift and erosion is another risk, as exemplified by the biodegradation of the Turtle and Barnett oils. Reservoir quality is variable, with the preservation of porosity and permeability within Carboniferous reservoirs and the Keyling Formation a significant risk. Sealing capacity needs to be addressed, given that oil shows occur throughout Carboniferous and Permian sediments in the wells of the southern Petrel Basin.

AUSTRALIA 2013 Offshore Petroleum Exploration Acreage Release 7

DATA SETSFor the Wells Data Listing go to http://www.petroleum-acreage.gov.au/2013/support/geo.html

For the Seismic Surveys Listing go to http://www.ga.gov.au/energy/projects/acreage-release-and-promotion/2013.html#data-packages

GEOSCIENCE AUSTRALIA PRODUCTS

Regional Geology and Seismic• Petrel Sub-basin Study 1995–1996: Summary Report. Australian Geological Survey Organisation

Record 1996/40. GEOCAT 22670

• Line Drawings of AGSO – Geoscience Australia’s Regional Seismic Profiles, Offshore Northern and Northwestern Australia, Australian Geological Survey Organisation Record 2001/36. GEOCAT 36353

• Interpreted Horizons and Faults for Seismic Survey 100. Petrel Sub-basin—Digital Horizon and Fault Data in ASCII Format. GEOCAT 35239

• Seabed Environments and Shallow Geology of the Petrel Sub-basin, Northern Australia SOL5463 (GA0335) Post Survey Report (NLECI Program), Geoscience Australia Record 2012/66. GEOCAT 74627

Stratigraphy• Bonaparte Basin Biozonation and Stratigraphy Chart 33. GEOCAT 70371

Petroleum Systems and Accumulations• Bonaparte Basin, NT, WA, AC and JPDA, Australian Petroleum Accumulations Report 5, 2nd Edition, 2004.

GEOCAT 60865

• Australian Petroleum Systems – Petrel Sub-basin module. Australian Geological Survey Organisation Record 1995/07. GEOCAT 37162

• The Petroleum Systems of the Bonaparte Basin, 2004. GEOCAT 61365

• Source Rock Time-slice Maps, Offshore Northwest Australia—1:3,000,000 Scale, 2004. GEOCAT 61179

• Oils of Western Australia II: Regional Petroleum Geochemistry and Correlation of Crude Oils and Condensates from Western Australia and Papua New Guinea, Geoscience Australia and GeoMark Research, 2005, GEOCAT 37512

• Characterisation of Natural Gases from West Australian Basins: Bonaparte Basin Module. AGSO and Geotechnical Services non-exclusive study, 2000. GEOCAT 33569

Contact Geoscience Australia’s Sales Centre for more information or to order these reports or products, phone 61 (0)2 6249 9966, email sales@ga.gov.au

AUSTRALIA 2013 Offshore Petroleum Exploration Acreage Release 8

KEY REFERENCESAHMUD, M. AND MUNSON, T.J., 2013— Chapter 36: Bonaparte Basin. In: Ahmad, M. and Munson, T.J., (compilers), Geology and mineral resources of the Northern Territory, Northern Territory Geological Survey, Special Publication 5.

BARRETT, A.G., HINDE, A.L. AND KENNARD, J.M., 2004—Undiscovered resource assessment methodologies and application to the Bonaparte Basin. In: Ellis, G.K., Baillie, P.W. and Munson, T.J. (eds), Timor Sea Petroleum Geoscience, Proceedings of the Timor Sea Symposium, Darwin, 19–20 June 2003. Northern Territory Geological Survey, Special Publication 1, 353–372.

COLWELL, J.B. AND KENNARD, J.M. (compilers), 1996—Petrel Sub-basin Study 1995–1996: Summary Report. Australian Geological Survey Organisation Record 1996/40, 122pp.

GORTER, J.D., JONES, P.J. NICOLL, R.S. AND GOLDING, C.J., 2005—A reappraisal of the Carboniferous stratigraphy and the petroleum potential of the southeastern Bonaparte Basin (Petrel Sub-basin), northwestern Australia. The APPEA Journal, 45(1), 275–296.

GORTER, J.D., MCKIRDY, D.M., JONES, P.J. AND PLAYFORD, G., 2004—Reappraisal of the Early Carboniferous Milligans Formation source rocks system in the southern Bonaparte Basin, northwestern Australia. In: Ellis, G.K., Baillie, P.W. and Munson, T.J. (eds), Timor Sea Petroleum Geoscience. Proceedings of the Timor Sea Symposium, Darwin, 19–20 June 2003. Northern Territory Geological Survey, Special Publication 1, 231–255.

GORTER, J.D., POYNTER, S.E., BAYFORD, S.W. AND CAUDULLO, A., 2008—Glacially influenced petroleum plays in the Kulshill Group (Late Carboniferous Early Permian) of the southeastern Bonaparte Basin, Western Australia. The APPEA Journal, 48(1), 69–113.

GRADSTEIN, F.M., OGG, J.G. SCHMITZ, M.D. AND OGG, G.M. (eds), 2012—The Geologic Time Scale 2012; Volumes 1 and 2. Elsevier BV, 1144 pp.

KENNARD, J.M., DEIGHTON, I., EDWARDS, D.S., BOREHAM, C.J. AND BARRETT, A.G., 2002—Subsidence and thermal history modelling: new insights into hydrocarbon expulsion from multiple petroleum systems in the Petrel Sub-basin, Bonaparte Basin. In: Keep, M. and Moss, S. (eds), The Sedimentary Basins of Western Australia 3, Proceedings of the Petroleum Exploration Society of Australia Symposium, Perth, 2002, 409–437.

MCCONACHIE, B. A., BRADSHAW, M. T. AND BRADSHAW, J. 1996—Petroleum Systems of the Petrel Sub-basin – an integrated approach to basin analysis and identification of hydrocarbon exploration opportunities. The APPEA Journal, 36(1), 248–268.

MORY, A.J., 1991—Geology of the Offshore Bonaparte Basin, Northwestern Australia. Geological Survey of Western Australia Report, 29.

NICOLL, R.S., KENNARD, J.M., LAURIE, J.R., KELMAN, A.P., MANTLE, D.J., AND EDWARDS, D.S., 2009—[Web page] Bonaparte Basin Biozonation and Stratigraphy, 2009, Chart 33, Geoscience Australia.

ROBINSON, P. AND MCINERNEY, K., 2004—Permo-Triassic reservoir fairways of the Petrel Sub-basin, Timor Sea. In: Ellis, G.K., Baillie, P.W. and Munson, T.J. (eds), Timor Sea Petroleum Geoscience. Proceedings of the Timor Sea Symposium, Darwin, 19–20 June 2003. Northern Territory Geological Survey, Special Publication 1, 295–312.