Offshore Northern Perth Basin 2D and 3D Models of Depth to Magnetic Basement
During 2009-11 Geoscience Australia completed a petroleum prospectivity study of the offshore northern Perth Basin as part of the Australian Government's Offshore Energy Security Program. A significant component of the program was the acquisition of a regional 2D reflection seismic and potential field survey GA-310 in 2008/09, which has aided in furthering the understanding of basement within the northern Perth Basin. Geologic basement in the northern Perth Basin, defined here to be Precambrian and older, is deep and generally not resolved in the reflection seismic data. However the GA-310 magnetic anomaly data combined with Geoscience Australia's magnetic ship-track database and magnetic anomaly grid allowed an assessment of depth to magnetic sources, and estimation of sediment thickness, providing new insight into basement depth and trends. New magnetic susceptibility measurements taken from core of offshore wells of the northern Perth Basin, seismic interpretation and depth to magnetic source estimates using the magnetic spectral method have been used to constrain 2.5D magnetic forward models.
These magnetic models indicate that intrusion of the deepest sediments by high-susceptibility bodies is probable. The reflection seismic evidence for these bodies is not clear, though in some cases they may be associated with faults and structural highs. Where the modelled bodies penetrate the sediments they are mostly below or within the Permian strata. A moderate positive magnetic anomaly along the Turtle Dove Ridge is modelled in 2D by massive bodies whose tops are 5-15 km below sea floor. A depth to magnetic basement map highlights sub-basins and structural highs within the northern Perth Basin, and is shown to be a good first order approximation of sediment thickness and basin geometry. For instance maximum sediment thicknesses of the Abrolhos, Zeewyck and Houtman sub-basins are shown to be 10, 13.5 and 12 km respectively.
Simple
Identification info
- Date (Publication)
- 2011-01-01T00:00:00
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/73002
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Geoscience Australia
Canberra Author Johnston, S.W.
1 Author Petkovic, P.
2
- Name
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Record
- Issue identification
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2012/039
- Point of contact
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Role Organisation / Individual Name Details Custodian ED
Owner Commonwealth of Australia (Geoscience Australia)
Custodian Commonwealth of Australia (Geoscience Australia)
Voice
- Topic category
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- Geoscientific information
Extent
))
- Maintenance and update frequency
- Unknown
Resource format
- Title
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Product data repository: Various Formats
- Website
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Data Store directory containing the digital product files
Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
- Keywords
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GA Publication
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Record
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- Theme
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magnetics
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- Theme
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sedimentary basins
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- Theme
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marine
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- Keywords
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AU-WA
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- Australian and New Zealand Standard Research Classification (ANZSRC)
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Earth Sciences
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- Keywords
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Published_External
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
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CC-BY
- Edition
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4.0
- Access constraints
- License
- Use constraints
- License
Resource constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
- OnLine resource
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Download the Record (pdf)
Download the Record (pdf)
- Distribution format
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pdf
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Resource lineage
- Statement
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Unknown
- Hierarchy level
- Non geographic dataset
- Other
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GA Publication
- Description
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Source data not available.
Metadata constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
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urn:uuid/b0140d6f-15cf-55d6-e044-00144fdd4fa6
- Title
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GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice
Type of resource
- Resource scope
- Document
- Name
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GA Record
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/73002
- Date info (Revision)
- 2018-04-20T06:11:48
- Date info (Creation)
- 2011-10-25T00:00:00
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/122551