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Geochemical study and significance of sequential extraction in reservoir rocks of Turpan-Hamin Basin

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Chinese Science Bulletin

Abstract

Seven samples collected from the Turpan-Hamin Basin were treated by sequential extraction method. Analytical results indicate that the free oils, inclusion oils (oil-bearing fluid inclusions) and clay-adsorbed oils vary significantly. The geochemical characteristics of inclusion and clay-adsorbed oils correlate well with the lacustrine mudstones. The characteristics are as follows: (i) with higher Ph/nC18 ratio and lower Pr/Ph ratio; (ii) with higher values of C26 tricyclic/C24 tetracyclic terpane, C23 tricyclic terpane/(C23 tricyclic terpane+C3017α(H) hopane), C21/(C21+C29) sterane, Ts/Tm and C29Ts/C2917α(H) norhopane and lower value of C19/C21 tricyclic terpane; (iii) with relatively high content of C27 and C28 sterane and lower abundance of C29 sterane and diasterane. They indicate that the early charged oils are derived from the preJurassic lacustrine mudstones and the later charged oils are from the Jurassic coal-bearing strata or coals.

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Authors and Affiliations

  1. State Key Laboratory of Organic Geochemistry. Guangzhou Institute of Gcochemistry, Chinese Academy of Sciences, 510640, Guangzhou, China

    Linping Yu, Changchun Pan & Jiamo Fu

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  1. Linping Yu
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  2. Changchun Pan
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  3. Jiamo Fu
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Correspondence to Changchun Pan.

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Yu, L., Pan, C. & Fu, J. Geochemical study and significance of sequential extraction in reservoir rocks of Turpan-Hamin Basin. Chin. Sci. Bull. 49 (Suppl 1), 32–38 (2004). https://doi.org/10.1007/BF02890451

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  • DOI: https://doi.org/10.1007/BF02890451

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