Authors / CoAuthors
Jones, A.T. | Kennard, J.M. | Nicholson, C.J. | Mantle, D.J. | Grosjean, E. | Boreham, C.J. | Pfahl, M.C. | Jorgensen, D.C. | Robertson, D. | Bernardel, G.
Abstract
A geological assessment of the offshore northern Perth Basin, Western Australia, has been completed as part of the Australian Government's Offshore Energy Security Program. The study provides new insights into the petroleum prospectivity of the basin and enhances the potential for new oil and gas discoveries through reducing exploration risk. New sequence stratigraphic and geochemical studies of key offshore wells, in conjunction with revised biostratigraphy, have shown that the Late Permian-Early Triassic Hovea Member (Kockatea Shale) source interval, responsible for previous discoveries onshore and nearshore, is regionally extensive offshore and has good to excellent source-rock potential for generating oil. This is supported by fluid inclusion data that identified widespread palaeo-oil columns in Permian reservoirs below the regional Kockatea Shale seal. Petroleum systems modelling suggests oil derived from the Hovea Member in these palaeo-oil columns was generated either locally in the Abrolhos Sub-basin, or from the adjacent Houtman Sub-basin. A major exploration risk in the offshore northern Perth Basin is loss of petroleum accumulations due to trap breach. Stratigraphic plays, which can accumulate and preserve hydrocarbons away from faults, were identified to address this risk. A potential, large upper Permian stratigraphic play occurs within the Abrolhos depocentre. The interpreted clastic lowstand basin fan complex comprises a thick basinal succession and is overlain by the Kockatea Shale regional seal. 2D basin modelling indicates this potential reservoir was well positioned to receive lateral charge from the overlying Hovea Member.
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nonGeographicDataset
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73381
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- External Publication
- ( Theme )
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- marine
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2012-02-07T00:00:00
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