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Deep Structure of the Offshore Canning Basin, North West Shelf : SNOWS-3 (Survey 120) Post-cruise Report

In mid-1991, the Bureau of Mineral Resources (BMR; now the Australian Geological Survey Organisation, AGSO) commenced a program of deep-seismic acquisition on the southern North West Shelf with the intention of providing a regional framework data set for explorersin this highly prospective segment of Australia's continental margin. This program is part of a wider program that is acquiring a regional grid of deep-seismic data along the length of the North West Shelf. In particular, the program aims to:

*Determine the broad regional structural framework of the southern North West Shelf byexamining the boundaries between the major structural elements;

*Determine the deep crustal structure of the region;

*Assess the control of deep structure on the development of the major hydrocarbon fieldsand plays, and in particular the structural and depositional effects resulting from reactivation of these structures; and

*Acquire a set of high-quality seismic tie lines linking the deeper exploration wells throughout the region, to allow regional seismic correlations.


To address these aims, a multi-cruise program was devised during which deep-seismic data are being recorded. The first survey, SNOWS-1 (for Southern h_Torth Eest Shelf; AGSO Survey 101) was concentrated in the Barrow and Dampier Sub-basins and inner Exmouth Plateau. 1654 km of good-quality seismic data tied to 20 exploration wells were recordedand processed; these data frequently show basin structure down to a depth of at least 10 s two-way time (TWT). The second survey, SNOWS-2 (AGSO Survey 110), acquired morethan 2800 km of high-quality deep seismic data along 13 lines in the Beagle, Dampier, and Barrow Sub-basins, and over the full width of the Exmouth Plateau in mid-1992. These lineswere tied to 21 exploration wells, of which 3 were also tied during SNOWS-I, and again show reflections down to 12 s TWT.


The third survey in the program, SNOWS-3 (AGSO Survey 120), took place in July-August 1993, and acquired a total of 4052.5 km of high-quality deep-seismic data along 14 lines, tiedto 6 exploration wells (of which 2 were also tied on SNOWS-2) and Ocean Drilling Program Site 765 in the offshore Canning Basin, northeast extremity of the Carnarvon Basin, andO^Argo Abyssal Plain. SNOWS-3 ties in with the SNOWS-2 survey to the southwest and withthe Browse Basin deep-seismic survey (AGSO Survey 119, acquired in June, 1993) to the northeast.


The seismic data were recorded from a 4800 m streamer, configured with 192 x 25 m active groups. The record length was 16 seconds and the sample interval 2 msec. The seismicsource consisted of tuned airgun arrays with a total volume of 49 litres (3000 cu in). Shots were fired every 50 m at an average ship speed of 5 knots, providing 48-fold coverage.Streamer noise levels were low, with the average noise levels on acceptable channels generally being less than 1.5 rnicrobars.


Navigation for the survey was provided by two differential Global Positioning Systems (DGPS), using shore reference stations in Dampier and Broome, adjacent to the survey area.Full differential coverage was achieved for all but a few minutes of the survey. Positionalaccuracy is estimated to be probably better than +I- 10 metres.


The offshore Canning Basin is a complex amalgam of a WNW-ESE trending EarlyPalaeozoic intra-cratonic basin overlain by a NE-SW trending Late Palaeozoic to Mesozoicpassive margin basin (the Westralian Super-basin)

Simple

Identification info

Date (Publication)
1993-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/14652

Cited responsible party
Role Organisation / Individual Name Details
Publisher

Australian Geological Survey Organisation

Canberra
Author

Stagg, H.M.J.

1
Name

Record

Issue identification

1993/056

ISBN

0 642 19627 3

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
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
  • structural geology

Theme
  • seismics

Theme
  • marine

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

Legacy product, lineage not available

Hierarchy level
Non geographic dataset
Other

GA Publication

Description

Legacy product, 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/a05f7892-7496-7506-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/14652

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/a05f7892-7496-7506-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:14:45
Date info (Creation)
1996-10-30T00:00:00

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

 
 

Keywords

marine seismics structural geology

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