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    The effect of origin and genetic processes of low molecular weight aromatic hydrocarbons in petroleum on their stable carbon isotopic compositions

    Access Status
    Fulltext not available
    Authors
    Le Metayer, Pierre
    Grice, Kliti
    Chow, C.
    Caccetta, Louis
    Maslen, Ercin
    Dawson, Daniel
    Fusetti, L.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Le Metayer, P. and Grice, K. and Chow, C. and Caccetta, L. and Maslen, E. and Dawson, D. and Fusetti, L. 2014. The effect of origin and genetic processes of low molecular weight aromatic hydrocarbons in petroleum on their stable carbon isotopic compositions. Organic Geochemistry. 72: pp. 23-33.
    Source Title
    Organic Geochemistry
    DOI
    10.1016/j.orggeochem.2014.04.008
    ISSN
    01466380
    Remarks

    NOTICE: This is the author’s version of a work in which changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication.

    URI
    http://hdl.handle.net/20.500.11937/7147
    Collection
    • Curtin Research Publications
    Abstract

    Stable carbon isotopic compositions of individual low molecular weight aromatic hydrocarbons, such as alkylbenzenes, alkylnaphthalenes and alkylphenanthrenes, were measured from a set of oils, mostly from the North-West shelf of Australia, of varying age, facies type and thermal maturity. The objective was to assess the influence of thermal maturity and source during generation of these aromatics on their stable carbon isotopic compositions. For most of the oils studied, δ13C of the aromatic components show a 13C depletion as the degree of methylation increases. For the alkylnaphthalenes, the 13C depletion is most pronounced for low maturity oils compared to high maturity oils. δ13C of the methyl groups of these alkylnaphthalenes were calculated and the resulting data display significant differences between ‘mature’ and ‘immature’ oils, suggesting that isotopically lighter methyl groups are ‘released’ as thermal maturation proceeds. Therefore, we propose an isotopic fractionation associated with the methyl transfer mechanisms affecting low molecular weight aromatic hydrocarbons during diagenesis.

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