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Geochemical characteristics and origin of reservoir bitumens from Well Zhong 1 in the Katake Uplift, Tarim Basin

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Abstract

The source of marine crude oils from Tarim Basin is still disputed. However, research on the reservoir bitumens may provide a piece of new evidence to elucidate oil source. Geochemical characteristics of reservoir bitumens from different strata from Well Zhong 1 in the Katake Uplift were discussed here in detail. Pr/Ph ratios of reservoir bitumen from Well Zhong 1 range from 1. 14 to 1. 39, CPI ratios from 1.01 to 1.08, which indicates no odd-even predominance of normal alkanes, with OEP ratios ranging from 0.98 to 1.05. The contents of gammacerane and C28 sterane of reservoir bitumen from Well Zhong 1 are low, while dibenzothiophene series are abundant. Sterane isomerization maturity parameter and Ts/(Ts+Tm) ratio indicate that the reservoir bitumen from Well Zhong1 is mature to highly mature. Based on the differences in biomarker distribution, it is concluded that reservoir bitumen from Well Zhong 1, of which molecular parameters are contrary to those in Cambrian oil from Well Tadong 2, originated from the Upper Ordovician source rocks.

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Authors and Affiliations

  1. Department of Geochemistry, Key Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Jingzhou, 434023, China

    Youjun Tang

  2. Faculty of Natural Resources & Information Technology, China University of Petroleum, Beijing, 102249, China

    Youjun Tang & Ling Zan

Authors
  1. Youjun Tang
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  2. Ling Zan
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Correspondence to Youjun Tang.

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Tang, Y., Zan, L. Geochemical characteristics and origin of reservoir bitumens from Well Zhong 1 in the Katake Uplift, Tarim Basin. Chin. J. Geochem. 30, 398–404 (2011). https://doi.org/10.1007/s11631-011-0525-3

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  • DOI: https://doi.org/10.1007/s11631-011-0525-3

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