Authors / CoAuthors
Ryan, D.J. | O'Leary, R.P.D. | Nicholson, C.J. | Bradshaw, B.E. | Boreham, C.J.
Abstract
The Bremer Sub-basin is a Mid Jurassic - Late Cretaceous half-graben complex that forms the western-most depocentre of the Bight Basin. It is located across the continental slope off the southern coast of Western Australia in water depths of 100 - 4000 m and with no wells drilled in the sub-basin it is a rank frontier area for petroleum exploration. Through integrating dredge sample data with regional seismic interpretations, it has been possible to develop a structural and stratigraphic framework for the sub-basin, and assess the petroleum exploration potential using conventional basin analysis techniques. Structurally, the sub-basin comprises a series of en-echelon SW-NE trending fault-bounded half graben and a significant intra-basin fault system that developed as a result of rifting between Australia and Antarctica. Of particular importance to petroleum exploration are three major cycles of lacustrine and fluvial sedimentation in Late Jurassic - Early Cretaceous strata, which provide key petroleum system elements of both organic-rich source rocks to generate hydrocarbons, and sandstones overlain by thick mudstones that could potentially reservoir hydrocarbons. Exploration opportunities and risks vary across the sub-basin. A large potential source kitchen area occurs in the central part of the sub-basin, where sediments are between 4 - 9.5 km thick. Here, the main exploration play is fault block traps in water depths of 1000 - >2500 m. Smaller depocentres with up to 5 km of sediment fill occur in the western and eastern parts of the basin and host large anticlinal structures in water depths of 500 - 800 m.
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nonGeographicDataset
eCat Id
63983
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Keywords
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- External PublicationConference Paper
- ( Theme )
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- petroleum exploration
- ( Theme )
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- petroleum geology
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2006-01-01T00:00:00
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