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    δ13C of polycyclic aromatic hydrocarbons to establish the facies variations in a fluvial deltaic Triassic record (Dampier sub-Basin, Western Australia)

    Access Status
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    Authors
    Cesar, J.
    Grice, Kliti
    Date
    2017
    Type
    Journal Article
    
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    Citation
    Cesar, J. and Grice, K. 2017. δ13C of polycyclic aromatic hydrocarbons to establish the facies variations in a fluvial deltaic Triassic record (Dampier sub-Basin, Western Australia). Organic Geochemistry. 107: pp. 59-68.
    Source Title
    Organic Geochemistry
    DOI
    10.1016/j.orggeochem.2017.03.001
    ISSN
    0146-6380
    School
    Department of Chemistry
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/LP150100341
    URI
    http://hdl.handle.net/20.500.11937/52320
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 Elsevier Ltd The δ13C of polycyclic aromatic hydrocarbons (PAHs) was measured in a series of Triassic and Jurassic source rocks from the Dampier sub-Basin, Carnarvon Basin, North West Shelf of Australia. These sequences correspond to fluvial deltaic systems which integrate the Mungaroo, Brigadier and Legendre Formations, and the organic matter has been assigned as mixed terrigenous/marine material. The relative abundance of the PAHs was plotted against the difference between d13C values of 1,3,6,7-tetramethylnaphthalene (TeMN) and each PAH. We demonstrated here that samples plotting below 0 for ?13C (Combustion Marker-1,3,6,7 TeMN) are related to delta-plain/front-deltaic facies or coaly fluvial deltaic facies (e.g. samples from the Mungaroo Formation - North Rankin-5, Goodwyn-9 and Goodwyn-5 wells) whereas the positive region for ?13C (Combustion Marker-1,3,6,7 TeMN) is assigned to transitional facies deposited under an estuarine/lagoonal environment with a high sapropelic contribution (Brigadier Formation) and marginal marine environment (Legendre Formation). A similar separation for the samples was obtained with phenanthrene and other PAHs. The d13C of PAHs in combination with their distributions can be used to establish the facies type i.e. delta-plain/front-deltaic from estuarine/lagoonal in a dominantly fluvial deltaic record. Our research provides new tools to take into account for further applications in fluid-source rock correlation studies which represent the main challenge in assessing petroleum systems in the sub-Basin.

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