Constraining maturity assessment of Middle Cambrian organic-rich rocks in the southern Georgina Basin using geochemical and petrographic comparisons

Accurate measurement of thermal maturity of organic matter in sedimentary rocks that pre-date land plants is challenging. Chemical and petrographic examinations can provide reproducible thermal estimates but unless calibrated to absolute maturity scales (e.g. based on vitrinite reflectance and/or temperature) their application in burial histories will result in misleading petroleum prospectivity. Hence various published correlations exist between vitrinite reflectance (VR) and chemical maturity parameters (e.g. Tmax, MPI-1), the reflectance of other organic macerals (e.g. inertinite, alginite and bitumen) and faunal remnants (e.g. conodonts, graptolites and chitinozoans).

Herein, we use geochemical (Rock Eval, PyGC, GCMS of saturated and aromatic hydrocarbons) and petrographic techniques on organic matter from the early-Middle Cambrian Arthur Creek ('hot shale') Formation, Georgina Basin to characterise, compare and determine the thermal maturity on a composite natural maturity sequence; immature to gas mature (Figure 1). Petrographic maturity assessment employed modified vitrinite inertinite reflectance fluorescence (VIRF) which utilises quantitative fluorescence to objectively classify reflectance populations on a bivariate chart [1]. For very high maturity samples with negligible fluorescence Ro random was measured to correlate zooclast versus VR relationships [2].

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Date (Publication)
2014-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/82235

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Geoscience Australia

 Canberra
Author

Boreham, C.J.

 1
Author

Newman, J.

 2
Author

Edwards, D.S.

 3
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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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  • Geoscientific information
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Product data repository: Various Formats

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

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Unclassified
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English
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UTF8

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Commonwealth of Australia (Geoscience Australia)

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OnLine resource

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Download the presentation (pdf)

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  • pdf

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Unknown

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Non geographic dataset
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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/033dae57-e9cd-35e4-e054-00144fdd4fa6

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GeoNetwork UUID

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

Commonwealth of Australia (Geoscience Australia)

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Non geographic dataset
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nonGeographicDataset

Alternative metadata reference

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Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/82235

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/033dae57-e9cd-35e4-e054-00144fdd4fa6

Date info (Revision)
2018-04-20T06:06:20
Date info (Creation)
2014-09-17T00:00:00

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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

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Version 2.0, September 2018

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

 
 

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