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Characterisation of radiogenic monoalkenes in Australian oils and condensate
Thirteen Australian oils and one condensate, covering oil reservoir ages from Mesoproterozoic to Early Cretaceous, show monoalkene contents varying from 0.01 to 22.3 wt% of the whole liquid. Radiolysis of saturated hydrocarbons is the most likely process leading to oils with high alkene contents. The major radiolytic component is an unresolved complex mixture (UCM). The bulk of the resolved alkene compounds are positional isomers of n-alkenes. Methyl branched and cyclohexyl alkenes are minor components. Internal n-alkene isomers have a trans configuration dominant over the cis isomer. The oil with the longest reservoir residence time shows the highest content of internal n-alkenes relative to terminal 1-alkenes as well as the highest trans/cis ratio, suggesting the extended time has resulted in rearrangement to near thermodynamic equilibrium of the congruent monoalkenes. The radiolytic monoalkenes in the Ordovician-reservoired oil with the highest alkene content is likely influenced by a higher probability of intermolecular interactions and different product pathways in a complex mixture. Here, the relative proportion of alkene mimics the relative abundance of n-alkanes, suggesting that radiolytic C–C bond cleavage is suppressed when the alkene/alkane ratio is elevated and that the preferred pathway of n-alkane radiolysis favours the production of terminal monoalkenes. Radiolysis of the alkane UCM together with crosslinking and branching of n-alkane-derived radiolysis products contribute to the higher relative proportion of the alkene UCM. The similar carbon and hydrogen isotopic ratios of the n-alkanes and n-alkenes supports a parent–daughter relationship.
<b>Citation:</b> Christopher J. Boreham, Neel Jinadasa, Jacob Sohn, Ziqing Hong, Christopher Blake, Characterisation of radiogenic monoalkenes in Australian oils and condensate, <i>Organic Geochemistry</i>, Volume 163, 2022, 104332, ISSN 0146-6380, https://doi.org/10.1016/j.orggeochem.2021.104332.
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Identification info
- Date (Last Revision)
- 2021-07-14
- Date (Creation)
- 2021-07-14
- Date (Publication)
- 2025-01-09T00:50:45
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/145604
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- Codespace
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Digital Obejct Identifier
- Cited responsible party
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Role Organisation / Individual Name Details Author Boreham, C.
MEG Internal Contact Author Jinadasa, N.
MEG Internal Contact Author Sohn, J.
MEG Internal Contact Author Hong, Z.
MEG Internal Contact Author Blake, C.
External Contact Publisher Elsevier Ltd
External Contact
- Name
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Organic Geochemistry
- Issue identification
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Volume 163, January 2022, 104332
- Purpose
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Manuscript to be submitted to the Organic Geochemistry journal
- Status
- Completed
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Resource provider Minerals, Energy and Groundwater Division
External Contact Point of contact Boreham, C.
MEG Internal Contact
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- Geoscientific information
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Product data repository: Various Formats
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- theme.ANZRC Fields of Research.rdf
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EARTH SCIENCES
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- Theme
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oil radiolysis
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- Theme
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oil alkenes
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- Theme
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carbon and hydrogen isotopes
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- Keywords
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alkanes
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- Keywords
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unresolved complex mixture - UCM
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- Keywords
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Published_External
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All rights reserved
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Crown Copyright © 2021
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Australian Government Security ClassificationSystem
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- 2018-11-01T00:00:00
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- Unclassified
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- English
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- UTF8
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
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Manuscript to be submitted to the Organic Geochemistry journal
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Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
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urn:uuid/870fdf13-eb16-4319-a031-a32187d2c8df
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GeoNetwork UUID
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- UTF8
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Owner Boreham, C
Geoscience Australia Internal Contact Point of contact Boreham, C.
MEG Internal Contact
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- Document
- Name
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Journal Article
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Geoscience Australia - short identifier for metadata record with
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- Citation identifier
- eCatId/145604
- Date info (Creation)
- 2021-07-14T05:10:02
- Date info (Revision)
- 2021-07-14T05:10:02
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
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- https://pid.geoscience.gov.au/dataset/ga/122551