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Fingerprint of hydrocarbon generation in the southern Georgina Basin, Australia, revealed by small angle neutron scattering

Small angle neutron scattering (SANS) and ultra-small angle neutron scattering (USANS) are used to directly detect the processes of hydrocarbon generation in the 10 nm to 10 μm size pores in carbonate and siliciclastic rocks which contain no land-plant material suitable for conventional maturity determination by vitrinite reflectance. The method takes advantage of the pore-size-specific variation of neutron scattering contrast between the solid rock matrix and pore-space content with depth, which is caused by thermal maturation of organic matter through the oil and gas generation windows. SANS and USANS measurements were performed on bedding plane-orientated core slices, extracted from a series of 10 to 12 depth intervals for three wells, CKAD0001, MacIntyre 1 and Baldwin 1 in the southern Georgina Basin, central Australia. The depth intervals, intersecting the organic-rich basal ‘hot’ shales of the middle Cambrian Arthur Creek Formation, were selected based on Rock-Eval pyrolysis data. SANS and USANS results indicate that oil generation has occurred in the past in nano-sized pores in rocks that are now at depths of around 538.4 m in CKAD0001 and 799.3 m in MacIntyre 1. Furthermore, in the CKAD0001 well, the oil-wet pores extend into the larger pore-size range (at least up to 10 μm) due to the efficient expulsion of oil. At around 880 m in Baldwin 1, the influence of pyrobitumen reverts pore space from gas wet to oil wet. These hydrocarbons have remained in situ since the Devonian when the Neoproterozoic to Paleozoic section was exhumed in the Alice Springs Orogeny and subsequently eroded, preserving only remnants of the once extensive basin sediments.

Simple

Identification info

Date (Creation)
2017-05-17T00:00:00
Date (Publication)
2017-11-20T05:21:35
Date (Revision)
2017-11-20T05:23:09
Date (Revision)
2018-02-05T21:59:06
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/110782

Cited responsible party
Role Organisation / Individual Name Details
Co-author

Radlinski, A.P.

Co-author

Edwards, D.S.

Co-author

Boreham, C.J.

Publisher

Elsevier Ltd

External Contact
Name

International Journal of Coal Geology

Issue identification

Volume 186, 1 February 2018

Page

135-144

Purpose

Article for International Journal of Coal Geology

Status
Completed
Point of contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

Voice
Point of contact

Edwards, D.

MEG Internal Contact
Resource provider

Minerals, Energy and Groundwater Division

External Contact
Spatial representation type
Topic category
  • Geoscientific information

Extent

N
S
E
W


Maintenance and update frequency
Not planned

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
  • Georgina Basin

Keywords
  • Arthur Creek Formation

Keywords
  • Small angle neutron scattering (SANS)

Keywords
  • Ultra small angle neutron scattering (USANS)

Australian and New Zealand Standard Research Classification: Fields of Research
  • 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

Link to article

Link to article

Distribution format
  • html

OnLine resource

Free access to article up to March 27 2018

Free access to article up to March 27 2018

Distribution format
  • html

Resource lineage

Statement

N/A

Hierarchy level
Document

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/441fbb91-67f8-448b-9f78-82f8180458d4

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Owner

Edwards, D.

MEG Internal Contact
Point of contact

Edwards, D.

MEG Internal Contact

Type of resource

Resource scope
Document
Name

Journal Articles and Conference Papers

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/110782

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/441fbb91-67f8-448b-9f78-82f8180458d4

Date info (Creation)
2017-05-16T22:59:03
Date info (Revision)
2018-04-20T05:50:34

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

Arthur Creek Formation Georgina Basin Small angle neutron scattering (SANS) Ultra small angle neutron scattering (USANS)
Australian and New Zealand Standard Research Classification: Fields of Research
Earth Sciences

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