Petroleum potential of the offshore southern Carnarvon Basin—insights from new Geoscience Australia data*
I. Borissova A and G. Nelson AGeoscience Australia.
The APPEA Journal 51(2) 746-746 https://doi.org/10.1071/AJ10126
Published: 2011
Abstract
In 2008–9, under the Offshore Energy Security Program, Geoscience Australia (GA) acquired 650 km of seismic data, more than 3,000 km of gravity and magnetic data, and, dredge samples in the southern Carnarvon Basin. This area comprises the Paleozoic Bernier Platform and southern part of the Mesozoic Exmouth Sub-basin. The new seismic and potential field data provide a new insight into the structure and sediment thickness of the deepwater southernmost part of the Exmouth Sub-basin.
Mesozoic depocentres correspond to a linear gravity low, in water depths between 1,000 and 2,000 m and contain between 2 and 3 s (TWT) of sediments. They form a string of en-echelon northeast–southwest-oriented depressions bounded by shallow-dipping faults. Seismic data indicates that these depocentres extend south to at least 24°S, where they become more shallow and overprinted by volcanics.
Potential plays in this part of the Exmouth Sub-basin may include fluvio-deltaic Triassic sandstone and Lower–Middle Jurassic claystone source rocks sealed by the regional Early Cretaceous Muderong shale. On the adjoining Bernier Platform, minor oil shows in the Silurian and Devonian intervals at Pendock-1a indicate the presence of a Paleozoic petroleum system. Ordovician fluvio-deltaic sandstones sealed by the Silurian age marine shales, Devonian reef complexes and Miocene inversion anticlines are identified as potential plays.
Long-distance migration may contribute to the formation of additional plays close to the boundary between the two provinces. With a range of both Mesozoic and Paleozoic plays, this under-explored region may have a significant hydrocarbon potential.
Irina Borissova is a senior research scientist in Geoscience Australia’s Petroleum Prospectivity and Promotion Group. Irina has a PhD from the Russian Academy of Sciences and more than 15 years of experience in undertaking research and prospectivity assessments in frontier areas of the Australian margin. She has also contributed to several projects on the Southwest Margin including geology and potential prospectivity of the Naturaliste Plateau, the Vlaming Sub-basin and the Mentelle Basin. Member: PESA. |
Gabriel Nelson is a research scientist in Geoscience Australia’s Petroleum Prospectivity and Promotion Group. During his three years at Geoscience Australia, Gabriel has worked on prospectivity assessments of the Great Australian Bight, Perth Basin and Cuvier (Wallaby) Plateau. Prior to this work, he completed a master’s degree (Paleoproterozoic phosphorates) at Acadia University, Canada. Concurrent with graduate studies, he worked on frontier resource exploration teams for ExxonMobil in east Canada, and Kennecott Eagle Mining Company in the Great Lakes region of the USA. Member: PESA, GSAm. |
References
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