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Roebuck Basin

Entity ID: 22196 Compiled by: Miyazaki, S. Year: 2002 Status: Defined

Last Revised: 2014

Rank: province Type: sedimentary Subtype: polyhistory Location: WA Off-shore

Synonyms: Canning Basin (part), Western Canning Basin (part), Offshore Canning Basin (part), Rowley Depression Symbol: NA

Minimum age: Recent Age method: inferred, biostratigraphic correlation

Maximum age: Permian Age method: inferred, seismic interpretation

Summary: The Roebuck Basin is one of the least expored offshore basins of the Westralian Super-basin, containing Permian to Cretaceous siliclastic sediments and Tertiary carbonates.

Attributes:
Area (square kilometres): 93000
State: WA
Minimum present water depth (m): 0
Maximum present water depth (m): 5000
Main rock types: siliciclastic sediments and sedimentary rocks
Main rock types: carbonate sediments and sedimentary rocks
Main depositional environment: marine and non-marine
Maximum sediment thickness (m): 15000
Present crustal setting: continental
Country: AUS

Parent: No data

Child Provinces: No data

Relationships:
Adjoins - Beagle Sub-basin, Browse Basin [northeast boundary], Canning Basin [southeast boundary], Exmouth Plateau, Northern Carnarvon Basin [west boundary]

Constituent units: Bonaparte Formation, Dingo Claystone, Fossil Head Formation, Gearle Siltstone, Keraudren Formation, Keyling Formation, Locker Shale, Miria Formation, Muderong Shale, Nura Nura Member, Toolonga Calcilutite, Weaber Group, Bedout Volcanics, Calypso Formation, Cossigny Member, Forestier Claystone, Withnell Formation, Anderson Formation, Blina Shale, Lightjack Formation, Liveringa Group, Noonkanbah Formation, Depuch Formation, Bedout Formation, Reeves Formation, Treachery Formation, Kirkby Radiolarite, Cherrabun Formation

Events: No data

Mineral Deposits: No data

Key Reference: Smith, S.A., Tingate, P.R., Griffiths, C.M., Hull, J.N.F. 1999, The structural development and petroleum potential of the Roebuck Basin, APPEA Journal, 39(1), 364-385 (Refid:13255)

Comments: No data

Overview: The Roebuck Basin occurs in the central region of the North West Shelf between the Northern Carnarvon and Browse basins, comprising the Bedout Sub-basin, Bedout High and Rowley Sub-basin. The Roebuck Basin developed on the North West Shelf as a result of multi-phase rifting on the western flank of the offshore part of the Palaeozoic Canning Basin. After volcanic activity in the Late Permian, a period of thermal sag in the Triassic led to transgressive marine and deltaic sedimentation. A thick sequence of claystones was deposited during this period. This was followed by a series of transpressional events in the Late Triassic/earliest Jurassic. Lower and Middle Jurassic sediments represent fluvial and deltaic environments created as a result of thermal subsidence. A Callovian breakup event resulted in a phase of regional uplift and erosion. Upper Jurassic to Upper Cretaceous sediments grade into thick and prograding Cainozoic carbonates. No oil or gas discoveries have been made in the basin. By North West Shelf standards, however, the Roebuck Basin is poorly explored, with a total of seven wells drilled between 1971 and 1983. The basin lacks the thick, marine Upper Jurassic source rocks that are typically found in the inner parts of the Northern Carnarvon Basin to the southwest. Triassic source rocks, however, are well developed in the Roebuck Basin. Thermal maturation of organic source material may have been less pronounced in the basin than in the Northern Carnarvon and Browse basins. Consequently, trap-forming events are likely to have preceded the main phase of oil generation in the Roebuck Basin. The primary exploration targets in the basin are Lower to Middle Jurassic sandstones, which were deposited in deltaic to fluvial environments. A number of structural and stratigraphic plays have been identified on seismic data acquired in the late 1980s and 1990s.

Images: Roebuck Basin structural elements and cross-section location map (68 KB), Roebuck Basin chronostratigraphic chart (161 KB), Roebuck Basin regional cross-section Profile 120-03 (part) (226 KB)

Other media: No data

Source Information:

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This report was generated on Wednesday, April 16, 2014 5:41:14 PM EST.