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Recent advances in the Centralian Superbasin:

implications for petroleum prospectivity in WA

Peter Haines

Geological Survey of Western Australia

Murraba Basin

Government of Western Australia Department of Mines and PetroleumGovernment of Western Australia Department of Mines and Petroleum

Talk outline

• The Centralian Superbasin

• Amadeus Basin

• Murraba Basin

• Officer Basin

• ConclusionsAmadeus Basin


Centralian

Superbasin

Modified after Munson (2013);

Haines and Allen (2017)

• Neoproterozoic – Paleozoic

intracratonic basin

• Linked to Adelaide Rift Complex

• Fragmented by late Neoproterozoic

and Paleozoic tectonism

• Similar basin history and

stratigraphy throughout

• Paleozoic thin or absent in WA

• Neoproterozoic and Paleozoic

petroleum systems

• Only Neoproterozoic petroleum

systems significant in WA


Amadeus Basin


Amadeus Basin, WA

• WA Amadeus Basin now seamless stratigraphy with NT; to be used on future maps

• NT Neoproterozoic source units (Gillen, Aralka, Pertatataka Formations) now recognised in WA

• Better geophysical definition of basin boundaries allows redefined basin area in WA

• 1VD aeromagnetic data defines structural trends/closures under extensive sand cover

• Geophysical modelling by CSIRO (COBRA Project) better constrains 3D shape and thickness

• Evidence that salt tectonics during sedimentation and salt seal extends into WA

• New mineral exploration drilling provides samples for future source/maturity analysis


Amadeus Basin, NT Neoproterozoic hydrocarbon systems

Cambrian

Ediacaran

Cryogenian

Tonian

Neo

pro

tero

zo

ic

541 Ma

~635 Ma

~720 Ma

1000 Ma

Mesoproterozoic

SS1

SS2

SS3

SS4

Super-

sequences

Aralka Formation

Julie Formation

Arumbera Sst / Winnall beds

Olympic Fm / Pioneer Sst

Areyonga Formation

Heavitree Fm / Dean Quartzite

glacial erosion / unconformity


Amadeus Basin(Paleozoic omitted)

Pertatataka Formation

Wallara Formation

Dingo Gasfield, Orange 1, 2

Wallaby 1

Ooraminna 1, 2

Magee 1, Mt Kitty 1

Finke 1

Mt Winter 1

Dingo Gasfield, Ooraminna 2

Source Commercial gasfield Gas flow Oil show

Bitter Springs Group

Salt seal

Cambrian seal

6% He 9% He

Petermann

Orogeny


Amadeus Basin

• Aeromagnetic image clearly defines

tectonic basin boundary

• Amadeus outliers in Arunta Orogen

more extensive than previously

thought

• Canning Basin overlying Amadeus

Basin is thin (mostly Permian

Paterson Formation)

• One quarter of Amadeus in WA

GeoVIEW image

1VD aeromag

50 km


Amadeus Basin

Amadeus Basin46 000 km2 in WA

including outliers

¼ of total basin

Canning Basin

Amadeus outliers

Pre-Amadeus inliers

50 km

GeoVIEW image

1VD aeromag

• Aeromagnetic image clearly defines

tectonic basin boundary

• Amadeus outliers in Arunta Orogen

more extensive than previously

thought

• Canning Basin overlying Amadeus

Basin is thin (mostly Permian

Paterson Formation)

• One quarter of Amadeus in WA


Amadeus Basin, WA

• Magnetic contrast between stratigraphic units

allows mapping of structures under cover on

1VD aeromag imagery where dips are moderate

to steep

GeoVIEW image

1VD aeromag


Amadeus Basin, WA

• Salt-withdrawal mini-basins

20 kmGeoVIEW image

1VD aeromag


Amadeus Basin, WA

20 km

Gulf of Mexico

GeoVIEW image

1VD aeromag

• Salt-withdrawal mini-basins


Amadeus Basin, WA

20 kmGeoVIEW image

1VD aeromag

• Multi-phase salt movement and

compressional tectonics

(Petermann Orogeny)


Amadeus Basin, WA

20 km Salt diapir?

GeoVIEW image

1VD aeromag

• Multi-phase salt movement and

compressional tectonics

(Petermann Orogeny)


Amadeus Basin: CSIRO COBRA Project

WA WA NTNT

Amadeus + Canning

thickness

Amadeus + Canning

+ pre-Amadeus

thickness

• ~ 4 km average; ~6.5 km near NT border • Up to 12 km with ‘pre-Amadeus’ package


Murraba Basin

• Previously (pre-2005) included in Birrindudu Basin

• Previously correlated to only basal Centralian SB stratigraphy

• Previously assumed no hydrocarbon prospectivity

• Recent revaluation is first GSWA fieldwork

in upper Murraba stratigraphy since 1970s

• Now correlated with entire Neoproterozoic

succession of Amadeus Basin

• Possibility of similar Neoproterozoic

hydrocarbon systems to Amadeus

• Tentative evidence of salt tectonics




Murraba Basin cf. Amadeus Neoproterozoic stratigraphy

and hydrocarbon systems

Cambrian

Ediacaran

Cryogenian

Tonian

Ne

op

rote

rozo

ic

541 Ma

~635 Ma

~720 Ma

1000 Ma

Mesoproterozoic

SS1

SS2

SS3

SS4

Super-

sequences

Aralka Formation

Julie Formation

Arumbera Sst / Winnall beds

Olympic Fm / Pioneer Sst

Areyonga Formation

Heavitree Fm / Dean Quartzite



Amadeus Basin(Paleozoic omitted)

Red

cliff

Po

un

d G

p

Hidden Basin beds

Murraba Formation

Erica Sandstone

Munyu SstLewis Ra S

basement clast float (?glacial)

carbonate/chert float

fine sandstone/siltstone float

Murraba Basin(new interpretation)

carb.

co

nc

ea

led

Pertatataka Formation

Wallara Formation

Dingo Gasfield, Orange 1, 2

Wallaby 1

Ooraminna 1, 2

Magee 1, Mt Kitty 1

Finke 1

Mt Winter 1

Dingo Gasfield, Ooraminna 2

Source Commercial gasfield Gas flow Oil show

Bitter Springs Group

Salt seal

Cambrian seal

6% He 9% He


Officer Basin

• GSWA Vines 1: Reinterpretation indicates more complete

Neoproterozoic succession near WA border, analogous to SA

• Mulyawara 1 & Kutjara 1 (Rodinia 2011) in SA will improve

correlations across the border zone

• Stratigraphically extensive minor gas shows in Mulyawara 1 and

Kutjara 1 have implications for prospectivity of the Buldya Group

near the border in WA

• YOM deep crustal seismic line (GA/GSWA 2011) provides complete

transect of Officer Basin and puts key stratigraphic well GSWA

Empress 1/1A on seismic

• New mineral exploration drill cores to be studied in future

Vines 1

Mulyawara 1

Kutjara 1

Empress 1/1A

YOM seismic line




Officer Basin

• YOM seismic line (GA/GSWA, 2011)

provides complete transect of Officer

Basin and puts key stratigraphic well

GSWA Empress 1/1A on a seismic

• Salt structures intruding succession

• Underlying late Mesoproterozoic Basin

(oil shows & source rock in WMC NJD1)

From Neumann et al. (2013) GA Record 2013/28

Musgrave

Province


Conclusions

• Amadeus Basin• Unification of Amadeus Basin stratigraphy across WA ̶ NT border

• Neoproterozoic petroleum systems may extend into WA

• Improved geophysical imaging of basin structural margin and internal structures

• Extensive salt structures in WA Amadeus Basin

• Murraba Basin • More complete Centralian Superbasin stratigraphy than previously thought

• Similar to Amadeus Basin allows reconsideration of prospectivity

• Salt at depth likely

• Officer Basin• New data will improve interpretation and refine prospectivity near WA ̶ SA border

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