Data

Surface Grids, Isochron Grids, and Fault Maps, Offshore Otway Basin (Updated September 2024)

Name: Surface Grids, Isochron Grids, and Fault Maps, Offshore Otway Basin (Updated September 2024)
Published: 2022

Geoscience Australia

Commonwealth of Australia (Geoscience Australia)

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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://pid.geoscience.gov.au/dataset/ga/146398&rft.title=Surface Grids, Isochron Grids, and Fault Maps, Offshore Otway Basin (Updated September 2024)&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/146398&rft.publisher=Commonwealth of Australia (Geoscience Australia)&rft.description=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.Maintenance and Update Frequency: asNeededStatement: 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. 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&rft.creator=Commonwealth of Australia (Geoscience Australia) &rft.date=2022&rft.coverage=westlimit=138; southlimit=-40; eastlimit=144; northlimit=-38&rft.coverage=westlimit=138; southlimit=-40; eastlimit=144; northlimit=-38&rft_rights= https://creativecommons.org/licenses/by/4.0/&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=Any&rft_rights=Any&rft_rights=(c) Commonwealth of Australia (Geoscience Australia) 2021&rft_rights=Australian Government Security Classification System&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Australian Government Security Classification System&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=geoscientificInformation&rft_subject=Offshore Energy Systems&rft_subject=Deepwater Otway Basin study&rft_subject=2020 Otway Basin seismic program&rft_subject=Otway Basin&rft_subject=structural architecture&rft_subject=stratigraphic architecture&rft_subject=seismic interpretation&rft_subject=structural elements&rft_subject=hydrocarbon prospectivity&rft_subject=Basin Analysis&rft_subject=Earth Sciences not elsewhere classified&rft_subject=Geology not elsewhere classified&rft_subject=Petroleum and Coal Geology&rft_subject=Stratigraphy (incl. Biostratigraphy and Sequence Stratigraphy)&rft_subject=Structural Geology&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data

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Creative Commons Attribution 4.0 International Licence
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Creative Commons Attribution 4.0 International Licence

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4.0

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Contact Information

Brief description

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.

Lineage

Maintenance and Update Frequency: asNeeded

Statement: 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.

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

Notes

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.

Created: 15 03 2022

Modified: 16 05 2022

Data time period: 2020-02-05 to 2022-05-16

This dataset is part of a larger collection

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text: westlimit=138; southlimit=-40; eastlimit=144; northlimit=-38

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Other Information

Download Metadata Statement (pdf) [8.2 MB]

uri : https://d28rz98at9flks.cloudfront.net/146398/146398_01_4.pdf External Link

Download Data (zip) [190.5 MB]

uri : https://d28rz98at9flks.cloudfront.net/146398/146398_00_4.zip External Link

Identifiers

DOI : 10.26186/146398
URI : pid.geoscience.gov.au/dataset/ga/146398
global : f43f7c3f-d73b-45b3-8f08-db83621a9238

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