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Money Shoal Basin

Entity ID: 22330 Compiled by: Miyazaki, S. Year: 2002 Status: Defined

Last Revised: 2013

Rank: province Type: sedimentary Subtype: passive margin Location: NT On-shore and off-shore

Synonyms: NA Symbol: NA

Minimum age: Recent Age method: inferred, biostratigraphic correlation

Maximum age: Jurassic Age method: inferred, biostratigraphic correlation

Summary: The Jurassic-Recent Money Shoal Basin is a relatively large, mainly offshore, immature basin on the Northern Australian margin. It contains up to 4.5 km of marine and minor fluvio-deltaic sediments.

Attributes:
Area (square kilometres): 233000
State: NT
Minimum present water depth (m): 0
Maximum present water depth (m): 230
Main rock types: siliciclastic sediments and sedimentary rocks
Main depositional environment: marine and non-marine
Maximum sediment thickness (m): 4500
Present crustal setting: continental
Country: AUS

Parent: No data

Child Provinces: No data

Relationships:
Adjoins - Bonaparte Basin, Calder Graben, Carpentaria Basin
Overlies - Arafura Basin, Pine Creek Orogen

Constituent units: Bathurst Island Group, Darwin Formation, Flamingo Group, Plover Formation, Puffin Formation, Van Diemen Sandstone, Wangarlu Formation, Marligur Member, Frigate Shale, Marligur Formation, Tinganoo Bay beds

Events: No data

Mineral Deposits: No data

Key Reference: McLennan, J.M., Rasidi, J.S., Holmes, R.L., Smith, G.C. 1990, The geology and petroleum potential of the western Arafura Sea, APEA Journal, 30(1), p91-106 (Refid:42056)

Comments: Basin mapped and attributed to limit of Australia's EEZ.

Overview: The Jurassic to Recent Money Shoal Basin is a mainly offshore, tilted passive margin basin in Northern Australia. The basin has no specific depocentre and the stratigraphy is generally monoclinal and undeformed. The basal sediments range in age from Middle Jurassic in the west to Late Cretaceous in the east, and unconformably overlie the Arafura Basin and Pre-Cambrian rocks of the Pine Creek Geosyncline and McArthur Basin. The sediments are up to 4500 m thick in the northwest but thin rapidly eastwards, and were deposited in marine environments with occasional deltaic and fluvial incursions. The basin is bound to the west by the Lynedoch Fault System, separating the Money Shoal Basin from the Calder and Malita grabens of the Bonaparte Basin, and bound to the east by a Mesozoic hinge that separates the Money Shoal Basin from the Carpentaria Basin. The southern basin boundary is represented by onshore sediment pinchout. Little is known about the northern portion of the basin, which extends beyond the Australian-Indonesian seabed boundary. Nine petroleum exploration wells have been drilled in the offshore Money Shoal Basin (Nov 2002), all in the region of the underlying Goulburn Graben (Arafura Basin). Interbedded Jurassic claystones are considered to be source rocks of good quality, with the potential to generate oil and gas. Marginally mature Lower Cretaceous claystones are also present. Sandstones with good reservoir qualities occur at Jurassic and Lower Cretaceous levels, whereas sandstones within the underlying Palaeozoic Arafura Basin tend to be of low porosity. However, the Mesozoic sandstones are not always overlain by seal-quality claystones, and therefore the prime exploration risk within the Money Shoal Basin appears to be poor vertical seals. An additional risk is adequate source charge from Jurassic to Lower Cretaceous potential source units, or from the underlying Palaeozoic source units of the Arafura Basin.

Images: Arafura Basin regional cross-section Profile B-B' (73 KB), Arafura and Money Shoal basin stratigraphy (74 KB), Money Shoal Basin regional setting and structural elements map (76 KB), Money Shoal Basin structural elements and cross-section location map (66 KB), Money Shoal Basin regional cross-section Profile A-A' (41 KB)

Other media: No data

Source Information:

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This report was generated on Tuesday, September 2, 2014 8:08:01 AM EST.