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    Release of bound aliphatic biomarkers via hydropyrolysis from Type II kerogen at high maturity

    Access Status
    Fulltext not available
    Authors
    Lockhart, Robert
    Meredith, W.
    Love, G.
    Snape, C.
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Lockhart, R. and Meredith, W. and Love, G. and Snape, C. 2008. Release of bound aliphatic biomarkers via hydropyrolysis from Type II kerogen at high maturity. Organic Geochemistry. 39 (8): pp. 1119-1124.
    Source Title
    Organic Geochemistry
    Additional URLs
    http://www.elsevier.com/locate/orggeochem
    ISSN
    01466380
    URI
    http://hdl.handle.net/20.500.11937/7552
    Collection
    • Curtin Research Publications
    Abstract

    At relatively low maturity, kerogen-bound aliphatic biomarkers invariably display retardedmaturity compared to their ‘‘free” counterparts as a result of the protection afforded by themacromolecular structure. This study investigates the release of hopanes and steranes atelevated (post oil window) maturity from Type II kerogen. Results for a suite of NorthSea petroleum source rocks (Kimmeridge Clay Formation) indicate that, below a hydrogenindex (HI) value of ca. 300, differences between the ‘‘free” and ‘‘bound” phases for hopaneand sterane side chain isomerisation are small. However, ring isomerisation within the kerogen-bound phase is still more retarded. For a corresponding series of kerogen samplesartificially matured via hydrous pyrolysis, both ‘‘free” and ‘‘bound” phase side chain isomerisationreactions are significantly retarded relative to the naturally occurring samples.This is consistent with earlier studies, but the extent of retardation for ring isomerisationin the ‘‘bound” phase is even more pronounced than for the ‘‘free” phase.

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