Authors / CoAuthors
Nicholson, C. | Abbott, S. | Bernardel, G. | PoudjomDjomani, Y.
Abstract
Geoscience Australia has undertaken a regional seismic mapping study of the offshore Otway Basin extending across the explored inner basin to the frontier deep-water region. Seismic interpretation covers over 18000 line-km of new and reprocessed data acquired in the 2020 Otway Basin seismic program and over 40000 line-km of legacy 2D seismic data. We present new basin-scale isochore maps that show the distribution of the Cretaceous depocentres. Maps for the Lower Cretaceous Crayfish and Eumeralla supersequences, together with those recently published for the Upper Cretaceous Shipwreck and Sherbrook Supersequences, completes the set of isochore maps for the main tectonostratigraphic basin intervals. Mapping of basement involved faults has revealed structural fabrics that have influenced depocentre development. The tectonostratigraphic development of depocentres and maps of deep crustal units delineate crustal thinning trends related to late Cretaceous extension phases. This work highlights the need to review and update structural elements. For example, the boundary between the Otway and Sorell basins is now geologically constrained. The refinements to the tectonostratigraphic evolution of the Otway Basin presented here have important implications for the distribution and potential maturity of petroleum systems, especially with regard to heat flow associated with crustal extension. Presented at the 2024 Australian Energy Producers Conference & Exhibition (AEP) (https://energyproducersconference.au/conference/)
Product Type
document
eCat Id
149144
Contact for the resource
Resource provider
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
- ( Project )
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- Offshore Otway Basin precompetitive project
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- Otway Basin
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- Shipwreck Supersequence
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- Sherbrook Supersequence
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- structural architecture
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- Eumeralla Supersequence
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- basement
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- top lower laminated crust
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- reflection MOHO
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- basin boundaries
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- Crayfish Supersequence
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- Reflection Seismic
- theme.ANZRC Fields of Research.rdf
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- SedimentologyStratigraphy (incl. biostratigraphysequence stratigraphy and basin analysis)Seismology and seismic explorationStructural geology and tectonics
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- Published_External
Publication Date
2024-05-31T00:26:07
Creation Date
2023-12-23T16:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
This is an extended abstract for publication in the AEP Journal and presentation at the 2024 AEP conference to promote precompetitive work undertaken in the Otway Basin.
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Australian Energy Producers Conference and Exhibition, 20-23 May, Perth, Australia
Lineage
<div>This extended abstract presents the results of basin analysis work undertaken in the Offshore Otway basin (specifically seismic mapping of key supersequences, crustal reflectors, faults and structural elements).</div><div><br></div><div>Seismic mapping focussed on the 2020 Otway Basin 2D grid, selected legacy 2D lines, and parts of the Otway 3D Mega merge dataset. Supersequence boundaries (including basement), deep crustal reflector, and basement-involved fault interpretations were used to generate structure surfaces and isochore maps (Fig. 2). Structural elements including revised basin boundaries are labelled in Fig. 1a. New basement involved faults, anticlines and the Cretaceous isochore map are depicted in Fig. 1b.</div><div><br></div>
Parent Information
Extents
[-44.00, -9.00, 112.00, 154.00]
Reference System
Spatial Resolution
Service Information
Associations
Association Type - informed
Surface Grids, Isochron Grids, and Fault Maps, Offshore Otway Basin
eCat Identifier - 146398,
UUID - f43f7c3f-d73b-45b3-8f08-db83621a9238
Association Type - informed
Stratigraphic framework and structural architecture of the Upper Cretaceous in the deep-water Otway Basin – implications for frontier hydrocarbon prospectivity
eCat Identifier - 146281,
UUID - 7a937a00-9b9e-4831-a4bc-20f04eb26ebe
Source Information