Authors / CoAuthors
Abbott, S. | Cubitt, C. | Bernardel, G. | Nicholson, C. | Nguyen, D. | AEGC 2023 Conference Managers aegc@arinex.com.au.
Abstract
<div>The Sherbrook Supersequence (Campanian–Maastrichtian) is the youngest of four Cretaceous supersequences in the Otway Basin and was deposited during a phase of crustal extension. Supersequence thickness is typically less than 1000 ms TWT across the inboard platform. Beyond the platform edge up to 2 800 ms TWT of Sherbrook sediments were deposited in the deep-water Morum and Nelson sub-basins. Analysis of wireline-logs and cores from wells yielded fluvial, deltaic, coastal shelf gross depositional environments (GDEs). As the number of regionally mappable seismic facies is much less than the number of well-based GDEs, the integration of well-based environmental interpretations with seismic facies resulted in three main regional GDE (RGDE); Fluvial Plain, Coastal/Delta Plain, and Shelf. The Fluvial Plain and Coastal/Deltaic RGDEs are almost entirely restricted to the inboard platform areas of the basin. The mud-prone Shelf RGDE is widespread across the deep-water part of the basin where it forms the depocentres of the Morum and Nelson sub-basins. The Shelf RGDE is well imaged on the Otway 2020 2D seismic data that was acquired over the deep-water Otway Basin. In the Morum Sub-basin, the Shelf RGDE is strongly influenced by growth on extensional faults. In contrast, the Shelf RGDE in the Nelson Sub-bsin is a relatively unstructured progradational complex. The presence of mass-transport and incision complexes are consistent with active tectonism during Sherbrook deposition. Reservoir rocks in the deep-water basin are best developed in the Coastal/Deltaic RGDE where it encroaches into the Morum Sub-basin, and where the Austral 3 petroleum system was potentially active within the Sherbrook Supersequence. </div> This presentation was given at the 2023 Australasian Exploration Geoscience Conference (AEGC) 13-18 March, Brisbane (https://2023.aegc.com.au/)
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document
eCat Id
147395
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Keywords
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- Otway Basin
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- Sherbrook Supersequence
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- gross depositional environment
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- seismic facies
- theme.ANZRC Fields of Research.rdf
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- Stratigraphy (incl. biostratigraphysequence stratigraphy and basin analysis)
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- Published_External
Publication Date
2023-03-24T04:15:40
Creation Date
2022-11-06T18:00:00
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Promotion to industry and academic stakeholders of project work in the offshore Otway Basin undertaken by the Offshore Energy Systems directorate.
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geoscientificInformation
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Australasian Exploration Geoscience Conference 13-18 March 2023 Brisbane QLD
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<div>Extended abstract for the 4th Australian Energy and Exploration Conference, 13-18 March 2023, Brisbane, Australia</div>
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[-41.00, -37.00, 138.00, 144.00]
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Stratigraphic and Structural architecture of the deepwater Otway Basin Upper Cretaceous - implications for frontier hydrocarbon prospectivity
eCat Identifier - 146281,
UUID - 7a937a00-9b9e-4831-a4bc-20f04eb26ebe
Association Type - informed
Surface Grids, Isochron Grids, and Fault Maps, Offshore Otway Basin
eCat Identifier - 146398,
UUID - f43f7c3f-d73b-45b3-8f08-db83621a9238
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