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    Flash pyrolysis of kerogens from algal rich oil shales from the Eocene Huadian Formation, NE China

    Access Status
    Fulltext not available
    Authors
    Zhang, Z.
    Volkman, J.
    Greenwood, Paul
    Hu, W.
    Qin, J.
    Borjigin, T.
    Zhai, C.
    Liu, W.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhang, Z. and Volkman, J. and Greenwood, P. and Hu, W. and Qin, J. and Borjigin, T. and Zhai, C. et al. 2014. Flash pyrolysis of kerogens from algal rich oil shales from the Eocene Huadian Formation, NE China. Organic Geochemistry. 76: pp. 167-172.
    Source Title
    Organic Geochemistry
    DOI
    10.1016/j.orggeochem.2014.08.004
    ISSN
    01466380
    School
    Department of Applied Chemistry
    URI
    http://hdl.handle.net/20.500.11937/47540
    Collection
    • Curtin Research Publications
    Abstract

    The hydrocarbon composition of the kerogen fractions of two samples (HD-20 and HD-21) from oil shale layer 4 in the Eocene Huadian Formation, NE China were investigated by analytical flash pyrolysis (650 C/10 s) followed by gas chromatography–mass spectrometry (Py–GC–MS). Organic petrography showed that the two kerogens were almost entirely derived from algal remains but contained very different algal maceral compositions, with 40% of the macerals in HD-20 being of macroalgal origin that were not present in HD-21. Py–GC–MS yielded high concentrations of n-alkanes from both kerogens, but with different molecular weight profiles due to the different algal contributors to the two kerogen samples. The hydrocarbon pyrolysates generated at 650 C from HD-21 in which the green microalga Botryococcus braunii was identified showed a higher proportion of longer chain alkanes and alkenes presumably from cracking of the botryococcus algaenan. We also identified a C40 monoaromatic lycopane derivative, which was absent in the HD-20. The high hydrocarbon potential of both kerogens can be attributed to common microalgal sources, whereas the macroalgae, which is abundant in HD-20, makes only a minor contribution to the hydrocarbon products.

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