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    Thermochemical sulfate reduction in fossil Ordovician deposits of the Majiang area: Evidence from a molecular-marker investigation

    204004_204004.pdf (943.5Kb)
    Access Status
    Open access
    Authors
    Wang, Guangli
    Li, N.
    Gao, B.
    Li, X.
    Shi, S.
    Wang, T.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Wang, G. and Li, N. and Gao, B. and Li, X. and Shi, S. and Wang, T. 2013. Thermochemical sulfate reduction in fossil Ordovician deposits of the Majiang area: Evidence from a molecular-marker investigation. Chinese Science Bulletin. 58 (28-29): pp. 3588-3594.
    Source Title
    Chinese Science Bulletin
    DOI
    10.1007/s11434-013-5843-x
    ISSN
    10016538
    Remarks

    This article is published under the Open Access publishing model and distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/2.0/ Please refer to the licence to obtain terms for any further reuse or distribution of this work.

    URI
    http://hdl.handle.net/20.500.11937/6675
    Collection
    • Curtin Research Publications
    Abstract

    The main reservoirs of Majiang fossil deposits consist of the Silurian Wengxiang group, dominantly sandstones, and the Ordovician Honghuayuan formation, dominantly carbonate rocks, and the Lower Cambrian Niutitang Formation mudstones serve as the major source rocks. Thermochemical sulfate reduction (TSR) might have taken place in the Paleozoic marine carbonate oil pools, as indicated by high concentrations of dibenzothiophenes in the extracts (MDBT=0.27-4.32 µg/g extract, and MDBT/MPH= 0.71-1.38). Hydrocarbons in the Pojiaozhai Ordovician carbonate reservoirs have undergone severe TSR and are characterized by higher quantities of diamondoids and MDBT and heavier isotopic values (δ13C=-28.4‰). The very large amounts of dibenzothiophenes might be products of reactions between biphenyls and sulfur species associated with TSR.

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