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    High abundance of alkylated diamondoids, thiadiamondoids and thioaromatics in recently discovered sulfur-rich LS2 condensate in the Tarim Basin

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    Authors
    Zhu, G.
    Zhang, Y.
    Zhang, Z.
    Li, T.
    He, N.
    Grice, Kliti
    Neng, Y.
    Greenwood, Paul
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Zhu, G. and Zhang, Y. and Zhang, Z. and Li, T. and He, N. and Grice, K. and Neng, Y. et al. 2018. High abundance of alkylated diamondoids, thiadiamondoids and thioaromatics in recently discovered sulfur-rich LS2 condensate in the Tarim Basin. Organic Geochemistry. 123: pp. 136-143.
    Source Title
    Organic Geochemistry
    DOI
    10.1016/j.orggeochem.2018.07.003
    ISSN
    0146-6380
    School
    School of Molecular and Life Sciences (MLS)
    URI
    http://hdl.handle.net/20.500.11937/70015
    Collection
    • Curtin Research Publications
    Abstract

    Molecular and stable sulfur isotopic (d34S) analysis of petroleum recently discovered in the Bachu uplift of the Tarim Basin (China) was conducted to characterize the oil and assist future regional petroleum correlation studies. Sulfur-rich condensate from the Lower Ordovician – Upper Cambrian reservoir rock in the LS2 well showed abundant aromatic hydrocarbons and organic sulfur compounds. Extensive distributions of alkylated caged hydrocarbons (i.e., diamondoids) and caged sulfur compounds (thiadiamondoids), including many additional isomers not previously detected in petroleum, were resolved by GC × GC–MS analysis. The thiadiamondoid products and thioaromatics (i.e., benzothiophenes, dibenzothiophenes), also detected in LS2, products were attributed to a major thermochemical sulfate reduction (TSR) event, which resulted in elevated H2S (3.66%) and dry gas in the condensate. TSR might also have contributed to the generally heavier d34S values of the benzothiophenes (+26 to +28‰) compared to dibenzothiophenes (+20 to +27‰). The LS2 reservoir has no sulfate evaporites and the temperature (144 °C) is relatively low for TSR, implying that it is a secondary reservoir for migrated TSR-derived gas, possibly derived from deeper and hotter (>200 °C) Cambrian strata.

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