A Review of Ordovician Source Rocks, Canning Basin, Western Australia

Petroleum source rocks are found at three levels in the Ordovician sectionin the Canning Basin and appear to be at similar stratigraphic levels and ofsimilar organic facies to the source rocks which have produced the gas andgas-condensate fields in the Amadeus Basin. In both basins shallowintersections in drillholes have yielded material at a low level of thermal maturity.Samples have shown that these immature source rocks contain algal-sourcedType 1 kerogens with a high hydrogen index and a large capacity to generate oil(eg Hoffmann et al., 1987). Deeper wells in both basins encountered sourcerocks at higher levels of maturity associated in some cases with oil fluorescenceand shows of live oil. By comparing the results of Rock-Eval pyrolysis analysisfor these more mature source rocks with those of the immature rocks the degreeof kerogen conversion to hydrocarbon (the Transformation Ratio of Espitalie eta)., 1986) can be estimated. The results from 14 wells along the BroomePlatform show a rapid downward increase in transformation ratio (TR) through theOrdovician section which can be correlated to the rapid downward increase in theconodont alteration index (CAI) previously documented by Nicoll & Gorter (1984).This correlation shows that the zone of peak oil generation lies between the endof CAI Zone 1 and the beginning of CAI Zone 2.


The Ordovician in the Canning Basin is known mainly from intersectionsin 22 drillholes. It is thickest in two sub-basins: the Willara, bounded to the northby the Admiral Bay Fault, and a larger unnamed sub-basin (roughly coincidentwith the later Fitzroy Trough), bounded to the north by the Oscar Range-Pinnaclefault system. Both fault systems appear to have been active during thedeposition of the Ordovician. The best known source rocks occur along thesouthern side of the northern sub-basin; they appear to be poorly developed, orabsent, in the Willara Sub-basin. Overmature source beds are locally preservedin fault remnants under the Lennard Shelf and may exist at great depth in theFitzroy Trough.

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Identification info

Date (Publication)
1992-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/14552

Cited responsible party
Role Organisation / Individual Name Details
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Bureau of Mineral Resources, Geology and Geophysics

 Canberra
Author

Taylor, D.

 1
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Record

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1992/043

ISBN

0642182639

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ED
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Commonwealth of Australia (Geoscience Australia)
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Commonwealth of Australia (Geoscience Australia)

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Unknown

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Product data repository: Various Formats

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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

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  • Record

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  • petroleum geology

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  • stratigraphy

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  • AU-WA

Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

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  • Published_External

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Creative Commons Attribution 4.0 International Licence

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CC-BY

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4.0

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http://creativecommons.org/licenses/

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License

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Australian Government Security ClassificationSystem

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2018-11-01T00:00:00
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Unclassified
Language
English
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UTF8

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Commonwealth of Australia (Geoscience Australia)

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Download the Record (pdf)

Download the Record (pdf)

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  • pdf

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GA Publication

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Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
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https://www.protectivesecurity.gov.au/Pages/default.aspx

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Unclassified

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urn:uuid/a05f7892-74e2-7506-e044-00144fdd4fa6

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Language
English
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UTF8
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Commonwealth of Australia (Geoscience Australia)

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Document
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GA Record

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Geoscience Australia - short identifier for metadata record with

uuid

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eCatId/14552

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/a05f7892-74e2-7506-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:17:52
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

petroleum geology stratigraphy

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