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Turtle Dove Ridge

Entity ID: 27019 Compiled by: Bradshaw, B.E. Year: 2003 Status: Defined

Last Revised: 2013

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

Synonyms: Turtle Dove High Symbol: NA

Minimum age: Recent Age method: inferred, biostratigraphic correlation

Maximum age: Early Permian Age method: inferred, biostratigraphic correlation

Summary: The Permian to Cainozoic Turtle Dove Ridge is a north-northwest orientated basement ridge that contains up to 5km of predominantly siliciclastic marine and non-marine sedimentary rocks.

Attributes:
Area (square kilometres): 4100
State: WA
Minimum present water depth (m): 0
Maximum present water depth (m): 1000
Main rock types: siliciclastic sediments and sedimentary rocks
Main depositional environment: marine and non-marine
Minimum sediment thickness (m): 1000
Maximum sediment thickness (m): 5000
estimated from depth to basement map of Blyth 1994
Present crustal setting: continental
Country: AUS

Parent: Perth Basin

Child Provinces: No data

Relationships:
Adjoins - Abrolhos Sub-basin, Houtman Sub-basin, Vlaming Sub-basin, Zeewyck Sub-basin

Constituent units: Cardabia Calcarenite, Kockatea Shale, Korojon Calcarenite, Lesueur Sandstone, Beekeeper Formation

Events: No data

Mineral Deposits: No data

Key Reference: Bradshaw, B.E., Rollet, N., Totterdell, J.M., Borissova, I. 2003, A revised structural framework for frontier basins on the southern and southwestern Australian continental margin., Geoscience Australia. Record, 2003/03, 44 (Refid:13490)

Comments: No data

Overview: The Turtle Dove Ridge is a north-northwest orientated basement ridge beneath the continental shelf and slope that divides the offshore northern and southern parts of the Perth Basin. The Turtle Dove Ridge extends over an area of 4100 sq. km from shallow coastal waters to 1000 m water depth. Although it is a well established structural element of the Perth Basin, the structural nature of the Turtle Dove Ridge is still poorly understood and is best described as a broad area of shallow basement. The Turtle Dove Ridge formed from the inversion of Permian, Triassic and Jurassic syn-rift and post-rift strata during the break-up of Australia and Antarctica in the Valanginian. Uplift was driven by either deep-seated intrusions and/or transpressional movement on strike-slip faults, and resulted in the erosion of up to 3000 m of stratigraphic section. The Turtle Dove Ridge thus consists of only a relatively thin stratigraphic section (1 to 5 km) in which Permian to Lower Triassic strata underlie the Valanginian break-up unconformity. Known strata include a marine carbonate Cenozoic to Cretaceous section, Middle to Lower Triassic continental sandstones, Lower to Middle Triassic marine shales, and Lower Permian marine shales. The Turtle Dove Ridge is a poorly explored part of the Perth Basin with only one well drilled in 1975, and no significant exploration since the Woodside Beagle Seismic survey in 1992 and Enterprise Oil's Plum Seismic Survey in 1992. Permian and Triassic marine shales form mature source rock intervals and regional seals across the Turtle Dove Ridge. It is uncertain if any reservoir units underlie the marine shales, however if present, these would have low primary porosities due to the original deep burial. The Turtle Dove Ridge contains several large (~100 sq. km) Valanginian- and possible Permian-age structures with fault-dependant closure. However, successful petroleum exploration depends on identifying potential reservoir intervals and areas with favourable timing of hydrocarbon migration versus trap formation.

Images: Perth Basin regional setting and cross-section location map (101 KB), Perth Basin regional cross-section Profile 3 (56 KB)

Other media: No data

Source Information:

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This report was generated on Wednesday, August 27, 2014 9:02:43 PM EST.