Towards a regional understanding of Sherbrook Supersequence Gross Depositional Environments, offshore Otway Basin

<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.&nbsp;</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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Date (Creation)
2022-11-06T18:00:00
Date (Publication)
2023-03-24T04:15:40
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Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/147395

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Commonwealth of Australia (Geoscience Australia)

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Abbott, S.

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Cubitt, C.

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Bernardel, G.

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Nicholson, C.

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Nguyen, D.

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AEGC 2023 Conference Managers aegc@arinex.com.au. aegc@arinex.com AEGC 2023 Conference Managers aegc@arinex.com.au.

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Australasian Exploration Geoscience Conference 13-18 March 2023 Brisbane QLD

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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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Minerals, Energy and Groundwater Division

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Commonwealth of Australia (Geoscience Australia)

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Abbott, S.

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Keywords

  • Otway Basin

Keywords

  • Sherbrook Supersequence

Keywords

  • gross depositional environment

Keywords

  • seismic facies

theme.ANZRC Fields of Research.rdf

  • Stratigraphy (incl. biostratigraphy

  • sequence stratigraphy and basin analysis)

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  • Published_External

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4.0

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© Commonwealth of Australia (Geoscience) 2022

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2018-11-01T00:00:00
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Australian Government Security Classification System

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Title

Stratigraphic and Structural architecture of the deepwater Otway Basin Upper Cretaceous - implications for frontier hydrocarbon prospectivity

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146281

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7a937a00-9b9e-4831-a4bc-20f04eb26ebe

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https://pid.geoscience.gov.au/dataset/ga/146281

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Title

Surface Grids, Isochron Grids, and Fault Maps, Offshore Otway Basin

Citation identifier
146398

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f43f7c3f-d73b-45b3-8f08-db83621a9238

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https://pid.geoscience.gov.au/dataset/ga/146398

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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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2018-11-01T00:00:00
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Commonwealth of Australia (Geoscience Australia)

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Abbott, S.

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Conference Abstract

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Date info (Creation)
2023-03-24T03:23:52
Date info (Revision)
2023-03-24T03:23:52

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AU/NZS ISO 19115-1:2014

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ISO 19115-1:2014

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ISO 19115-3

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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

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Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

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Keywords

theme.ANZRC Fields of Research.rdf
Stratigraphy (incl. biostratigraphy sequence stratigraphy and basin analysis)

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