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Ipswich Basin

Entity ID: 21915 Compiled by: Taubert, S. Year: 2001 Status: Informal

Last Revised: 2013

Rank: province Type: sedimentary Subtype: intermontane Location: NSW, QLD On-shore and off-shore

Synonyms: NA Symbol: NA

Minimum age: Middle Triassic Age method: inferred, biostratigraphic correlation

Maximum age: Middle Triassic Age method: inferred, biostratigraphic correlation

Summary: The Triassic Ipswich Basin is a small, predominantly onshore, frontier petroleum basin located on the eastern Australian margin. The Ipswich Basin contains 1200 m of siliciclastic alluvial, fluvial and lacustrine rocks.

Attributes:
Area (square kilometres): 9000
State: NSW
State: QLD
Minimum present water depth (m): 0
Maximum present water depth (m): 90
Main rock types: organic-rich sediments and sedimentary rocks
Main rock types: siliciclastic sediments and sedimentary rocks
Main depositional environment: non-marine
Maximum sediment thickness (m): 1200
Resources: Coal - undifferentiated
Present crustal setting: continental
Country: AUS

Parent: No data

Child Provinces: No data

Relationships:
Underlies - Clarence-Moreton Basin, Nambour Basin

Constituent units: Blackstone Formation, Brisbane Tuff, Chillingham Volcanics, Colleges Conglomerate, Cooneana Sandstone Member, Cribb Conglomerate, Hector Tuff, Ipswich Coal Measures, Mount Byron Volcanics, Mount Crosby Formation, Portal Creek Volcanics, Red Cliff Coal Measures, Sugars Basalt, Tivoli Formation, Toogoolawah Group, Weir Basalt, Evans Head Coal Measures, Blackwall Breccia, Kholo Subgroup, Aranbanga Volcanic Group

Events: No data

Mineral Deposits: New Hill, Swanbank, Ipswich, Spring Mountain

Key Reference: (Refid:-1)

Comments: No data

Overview: The Middle Triassic Ipswich Basin is a small, frontier petroleum basin located in southeastern Queensland and northern New South Wales. The onshore component extends about 8000 sq. km and is bounded by the D'Aguilar Block to the north, the Beenleigh Block to the southeast, and the Ipswich Fault to the west. The eastern extent of the basin is not well known but probably covers an offshore area of about 1000 sq. km under Moreton Bay. The Ipswich Basin is overlain by the Late Triassic to Middle Jurassic Clarence-Moreton Basin in the south, and by the Late Triassic to Early Jurassic Nambour Basin in the east. The Ipswich Basin formed during a period of thermal subsidence in the Carnian that followed a period of oblique extension controlled by strike-slip faulting during the Scythian to Carnian. The basin-fill is dominated by sandstones, shales, conglomerates and coals deposited in alluvial, fluvial and lacustrine environments, with some interbedded volcanics. Petroleum exploration in the Ipswich Basin has been limited to 19 wells, half less than 250 m deep, with numerous unconfirmed oil shows and gas shows, but no commercial discoveries (Oct 2002). Potential gas prone source rocks are present in the Ipswich Basin. The poor reservoir quality of sandstones and the lack of regional seals reduce the potential for conventional hydrocarbons. However, potential coal seam methane resources may be present. Coals are an important resource in the Ipswich Basin and are mined at Swanbank.

Images: No data

Other media: No data

Source Information:

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This report was generated on Tuesday, September 2, 2014 10:22:13 AM EST.