Geochemical Characteristics and Their Significance of Crude Oilsfrom Chang 3 Oil Layer Group of Zhen 28 Well Field, Yanwu Highland

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  • (1.Department of Geochemistry, Yangtze University, Jinzhou 434023, China; 2. Key Laboratory of Oil and Gas Resources and Exploration Technology, Ministry of Education, Yangtze University, Jinzhou 434023, China;  3. No.1 Production Plant, Changqing Petroleum Exploration Bureau, Yan’an 716000, China)

Received date: 2008-03-10

  Revised date: 2008-08-01

  Online published: 2008-10-10

Abstract

Twelve crude oils from the Zhen 28 Well field in the Ordos Basin were systematically analyzed and the geochemical characteristics of biomarkers in these samples were studied. The distribution and composition of the biomarkers indicate: the distribution of normal alkane and tricyclic terpanes shows that homoneneae and higher plants contribute to organic material, and the latter is the main contributor; the values of Pr/Ph, Pr/n C17 and Ph/nC18 reflect that crude oils are generated in a low-oxidizing-low-reducing depositional environment; the content of gammacerane in crude oils suggests that crude oils are generated in a fresh water depositional environment; the parameters of C29 steranes and C31 hopanes isomers also reach equilibrium value, the value of diasteranes/regular\|steranes and Ts/(Tm+Ts) are high, CPI is close to 1, and the methylphenanthrene index suggests respectively that crude oils are in the mature stage.

Cite this article

LIU Yu-hua,; WEN Zhi-gang,; SONG Huan-xin,, ZHU Jian-bin . Geochemical Characteristics and Their Significance of Crude Oilsfrom Chang 3 Oil Layer Group of Zhen 28 Well Field, Yanwu Highland[J]. Natural Gas Geoscience, 2008 , 19(05) : 718 -721 . DOI: 10.11764/j.issn.1672-1926.2008.05.718

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