Authors / CoAuthors
Abstract
During 2021–2024 Geoscience Australia conducted regional seismic mapping across the offshore Otway Basin that extended into the frontier deep-water region. This work was part of a broader pre-competitive study undertaken in support of petroleum exploration. Seismic horizons and faults were interpreted on three regional data sets, including: over 18 000 line-km of new and reprocessed data compiled for the 2020 offshore Otway Basin seismic program; over 40 000 line-km of legacy 2D seismic data; and the Otway 3D Megamerge dataset. This digital dataset (publication date 9 September 2024) updates and replaces a previously released dataset (publication date 16 May 2022). This updated dataset includes 8 surface grids and 11 isochron grids generated from the following seismic horizons (in ascending stratigraphic order); MOHO (Mohorovičić discontinuity), TLLCC (top laminated lower continental crust), Base (base Crayfish Supersequence), EC2 (base Eumeralla Supersequence), LC1 (base Shipwreck Supersequence), LC1.2 (base LC1.2 Sequence), LC2 (base Sherbrook Supersequence), and T1 (base Wangerrip Supersequence). Fault polygons created for all surfaces (except for MOHO, TLLCC, and LC1.2) are also included in the dataset. Maps generated from the dataset depict deep-water Cretaceous depocentres, and trends in crustal thinning and rifting during the Cretaceous. This revised dataset has underpinned updates to regional structural elements, including a revision of the boundary between the Otway and Sorell basins.
Product Type
dataset
eCat Id
146398
Contact for the resource
Point of contact
Resource provider
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Digital Object Identifier
Keywords
- ( Project )
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- Offshore Energy Systems
- ( Project )
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- Deepwater Otway Basin study
- ( Project )
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- 2020 Otway Basin seismic program
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- Otway Basin
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- structural architecture
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- stratigraphic architecture
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- seismic interpretation
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- structural elements
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- hydrocarbon prospectivity
- theme.ANZRC Fields of Research.rdf
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- Basin AnalysisEarth Sciences not elsewhere classifiedGeology not elsewhere classifiedPetroleum and Coal GeologyStratigraphy (incl. Biostratigraphy and Sequence Stratigraphy)Structural Geology
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- Published_External
Publication Date
Creation Date
2022-03-15T11:00:00
Security Constraints
Legal Constraints
Status
completed
Purpose
The purpose of this product is to provide digital surface grids, isochron grids, and fault maps for the Offshore Otway Basin that industry and academic stakeholders can use and integrate in their own regional prospectivity studies in the area.
Maintenance Information
asNeeded
Topic Category
geoscientificInformation
Series Information
Lineage
This data is the result of regional seismic interpretation on offshore 2D seismic datasets. Key Upper Cretaceous supersequences where interpreted on 2D seismic data and tied to wells in Petrel software. Surfaces were then exported as ascii files from Petrel, imported to Petrosys where isochrones were generated. Faults were extracted from Petrel as shape files. All surfaces and isochrons are available as XYZ asci files.</br></br> If a copy of the pre-September 2024 version (V2) of this data is required it can be obtained by request to clientservices@ga.gov.au
Parent Information
Extents
[-40, -38, 138, 144]
Reference System
Spatial Resolution
Service Information
Associations
Association Type - dependency
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 - dependency
A new perspective on regional structural architecture across the offshore Otway Basin.
eCat Identifier - 149144,
UUID - 82b3b2cc-a96f-4b1c-93b5-a66342d2a423
Source Information