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Vlaming Sub-basin

Entity ID: 22022 Compiled by: Bradshaw, B.E. Year: 2003 Status: Defined

Last Revised: 2013

Rank: subprovince Type: sedimentary Subtype: polyhistory Location: WA On-shore and off-shore

Synonyms: NA Symbol: NA

Minimum age: Cenozoic Age method: inferred, biostratigraphic correlation

Maximum age: Cisuralian Age method: inferred

Summary: The ?Permian to Cenozoic Vlaming Sub-basin of the Perth Basin is a mainly offshore rift basin containing 15 km of siliciclastic fluvial-deltaic and marine rocks.

Attributes:
Area (square kilometres): 23000
State: WA
Minimum present water depth (m): 0
Maximum present water depth (m): 3000
Main rock types: carbonate sediments and sedimentary rocks
Main rock types: siliciclastic sediments and sedimentary rocks
Main depositional environment: marine and non-marine
Maximum sediment thickness (m): 15000
Present crustal setting: continental
Country: AUS

Parent: Perth Basin

Child Provinces: No data

Relationships:
Adjoins - Abrolhos Sub-basin, Turtle Dove Ridge, Vasse Shelf, Yallingup Shelf, Zeewyck Sub-basin

Constituent units: Bunbury Basalt, Coolyena Group, Gage Sandstone, Leederville Formation, Otorowiri Member, Otorowiri Siltstone (Now known as Otorowiri Formation), South Perth Shale, Warnbro Group, Yarragadee Formation, Straggler Member, Charlotte Sandstone, Mangles Member, Hawley Member, Jervoise Sandstone, Parmelia Group (Now known as Parmelia Group), Carnac Formation (Now known as Carnac Formation), Otorowiri Formation, Stragglers Member

Events: Australia-Greater India Breakup

Mineral Deposits: No data

Key Reference: Crostella, A., Backhouse, J. 2000, Geology and petroleum exploration of the central and southern Perth Basin, Western Australia, Geological Survey of Western Australia. Report, 57, 85 (Refid:12758)

Comments: No data

Overview: The Vlaming Sub-basin forms part of the Perth Basin on the southwestern margin of the Australian continent. Located mainly offshore, the sub-basin is relatively under-explored, with sixteen offshore wells and one onshore well drilled. One oil accumulation and one gas accumulation have been discovered (Gage Roads-1 and Marri-1 respectively, both sub-economic), while an oil show at Araucaria-1 and an oil and gas show at Gage Roads-2 have also been noted. The Vlaming Sub-basin is a deep (approximately 15 km), elongate, north-south trending trough that forms part of a complex polyphase Early Permian to Early Cretaceous rift system. The main depocentre in the Vlaming Sub-basin contains a very thick (up to 8000 m) Middle Jurassic to Lower Cretaceous syn-rift succession, which is overlain by a thick (up to 2000 m) Lower Cretaceous to Cenozoic, post-break-up succession. No wells have penetrated below Middle Jurassic strata from the Yarragadee Formation. However, up to 5000 m of older Permian to Lower Jurassic strata are probably also present. Also included in the mapped extents of the Vlaming Sub-basin is an extensive area (7900 sq. km) of shallow basement referred to as the Edward's Island Block. While a history of growth faulting is evident throughout the syn-rift section, most structures are associated with the break-up of Australia and Greater India during the Valanginian. Faulting prior to and during break-up produced a half-graben style of basin architecture, with associated strike-slip faults, anticlinal rollovers, collapse systems, and a prominent break-up unconformity with up to 1200m of relief. Most exploration has focussed on structural highs and tilted fault blocks located updip of the main source kitchen, the Bathurst Syncline. Oil source correlations suggest that the Middle to Upper Jurassic Yarragadee Formation is the main source rock interval. Successful exploration in the Vlaming Sub-basin requires predicting the extent, thickness and quality of seals, particularly Lower Cretaceous marine shales from the post-break-up section.

Images: Perth Basin regional setting and cross-section location map (101 KB), Perth Basin regional cross-section Profile 3 (56 KB), Perth Basin regional cross-section Profile 5 (63 KB), Perth Basin regional cross-section Profile 6 (58 KB), Southern Perth Basin stratigraphy (78 KB)

Other media: No data

Source Information:

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This report was generated on Saturday, August 23, 2014 3:40:06 PM EST.