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Bamaga Basin

Entity ID: 22360 Compiled by: Miyazaki, S. Year: 2002 Status: Defined

Last Revised: 2013

Rank: province Type: sedimentary Subtype: intracratonic Location: QLD Off-shore

Synonyms: NA Symbol: NA

Minimum age: Paleozoic Age method: inferred, seismic interpretation

Maximum age: Paleozoic Age method: inferred, seismic interpretation

Summary: The Bamaga Basin is a small, offshore, frontier intracratonic sag basin in northern Australia that contains about 4500m of undrilled Palaeozoic sediments.

Attributes:
Area (square kilometres): 26000
State: QLD
Minimum present water depth (m): 50
Maximum present water depth (m): 70
Main rock types: carbonate sediments and sedimentary rocks
main rock types are inferred
Main depositional environment: marine and non-marine
depositional environments are inferrred
Minimum sediment thickness (m): 0
Maximum sediment thickness (m): 4500
interpreted from seismic
Present crustal setting: continental
Country: AUS

Parent: No data

Child Provinces: No data

Relationships: None

Constituent units:

Events: No data

Mineral Deposits: No data

Key Reference: Passmore, V.L., Williamson, P.E., Maung, T., Gary, A.R.G. 1993, The Gulf of Carpentaria - a new basin and new exploration targets., APEA Journal, 33(1), 297-314 (Refid:13193)

Comments: Basin is only mapped & attributed to limit of Australian waters. First defined by Passmore et al. (1992).

Overview: The Palaeozoic Bamaga Basin is a small, offshore intracratonic basin located within the shallow waters of the Gulf of Carpentaria, Queensland. The basin is poorly explored, with no exploration wells and a low coverage of seismic data. Previous exploration has concentrated on the overlying Mesozoic Carpentaria Basin, although most of the present geological knowledge is largely derived from onshore petroleum and stratigraphic wells and water bores. The basin comprises an asymmetric north-trending trough that developed as an intracratonic sag basin, but the actual age and lithology of the interpreted Palaeozoic section is uncertain. The thickest part of the Bamaga Basin lies just west of the trough axis, and contains more that 1.8 seconds two-way time of strata. The limits of the basin are erosional, pinching out to the east, south and west. The basin's limits are undefined north of the international boundary, however seismic mapping suggests that the basin extends well into Papua New Guinean and West Papuan waters. Regional geology suggests that source, reservoir and seal facies may be present, and that depth of burial is sufficient for hydrocarbon generation. There has been more than one period of faulting, including post-Bamaga reactivation of faults during the Cretaceous. This mild deformation and the resultant folding and faulting have created apparent structural closure at several levels. Potential for stratigraphic pinchout plays also exists where erosion has occurred along the upper flanks of the basin. Seismic anomalies that suggest the presence of hydrocarbons have been identified and are generally associated with faulting.

Images: No data

Other media: No data

Source Information:

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This report was generated on Thursday, April 17, 2014 5:32:15 AM EST.