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
Role Organisation / Individual Name Details
Publisher

Geoscience Australia

 Canberra
Author

Johnston, S.W.

 1
Author

Petkovic, P.

 2
Name

Record

Issue identification

2012/039

Point of contact
Role Organisation / Individual Name Details
Custodian

ED
Owner

Commonwealth of Australia (Geoscience Australia)
Custodian

Commonwealth of Australia (Geoscience Australia)

 Voice
Topic category
  • Geoscientific information

Extent

N
S
E
W


Maintenance and update frequency
Unknown

Resource format

Title

Product data repository: Various Formats

Website

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

  • GA Publication

  • Record

Theme

  • magnetics

Theme

  • sedimentary basins

Theme

  • marine

Keywords

  • AU-WA

Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

Keywords

  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License

Resource constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Commonwealth of Australia (Geoscience Australia)

 Voice
OnLine resource

Download the Record (pdf)

Download the Record (pdf)

Distribution format

  • pdf

Resource lineage

Statement

Unknown

Hierarchy level
Non geographic dataset
Other

GA Publication

Description

Source data not available.

Metadata constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/b0140d6f-15cf-55d6-e044-00144fdd4fa6

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

 Voice

Type of resource

Resource scope
Document
Name

GA Record

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/73002

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/b0140d6f-15cf-55d6-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:11:48
Date info (Creation)
2011-10-25T00:00:00

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

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

Edition

Version 2.0, September 2018

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

 
 

Spatial extent

N
S
E
W


Keywords

magnetics marine sedimentary basins

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