| Compositional characteristics and geochemical significance of light hydrocarbons for crude oils in Tarim Basin, China |
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| 作者姓名： | 张敏 |
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| 作者单位： | [1]Department of Geochemistry, Yangtze University, Jingzhou 434023, China [2]Key Laboratory of Exploration Technologies for Oil and Gas Resources （ Yangtze University）, Ministry of Education, Jingzhou 434023, China |
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| 摘 要： | Light hydrocarbons, especially C7 isoalkanes, cyclopentanes, cyclohexanes and n-heptane in 540 oils from the Tarim Basin were studied systematically. The results suggested the K1 values （2-MH＋ 2,3-DMP）/（3-MH ＋ 2,4-DMP） ] of crude oils vary from a lowest value of 0.78, to a highest value of 1.54, but the K1 values of the majority of oil samples （80%） range from 0.90 to 1.20. However, the absolute contents of （ 2-methylhexane ＋ 2,3-dimethylpentane） and （ 3-methylhexane ＋ 2,4-dimethylpentane） in the total light hydrocarbons （ C4-C7 ） show a similar variation trend. The variation of K1 values of crude oils can suggest a typical sedimentary environment for source rocks. Therefore, according to the compositional characteristics of C7 light hydrocarbons in light of the steady-state catalytic hypothesis, nonmarine oils from the Yingmaili area and marine oils from the Tazhong uplift in the Tarim Basin were genetically classified.
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| 关 键 词： | 中国 塔里木盆地 碳氢化合物 天然气 石油 地质构造 |
Compositional characteristics and geochemical significance of light hydrocarbons for crude oils in Tarim Basin, China |
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| Min Zhang.Compositional characteristics and geochemical significance of light hydrocarbons for crude oils in Tarim Basin, China[J].Chinese Journal of Geochemistry,2005,24(3):228-231. |
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| Authors: | Min Zhang |
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| Institution: | Yangtze University |
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| Abstract: | Light hydrocarbons, especially C7 isoalkanes, cyclopentanes, cyclohexanes and n-heptane in 540 oils from the Tarim Basin were studied systematically. The results suggested the K1 values (2-MH 2,3-DMP)/(3-MH 2,4-DMP)] of crude oils vary from a lowest value of 0.78, to a highest value of 1.54, but the K1 values of the majority of oil samples (80%) range from 0.90 to 1.20. However, the absolute contents of (2-methylhexane 2,3-dimethylpentane) and (3-methylhexane 2,4-dimethylpentane) in the total light hydrocarbons (C4-C7) show a similar variation trend. The variation of K1 values of crude oils can suggest a typical sedimentary environment for source rocks. Therefore, according to the compositional characteristics of C7 light hydrocarbons in light of the steady-state catalytic hypothesis, non-marine oils from the Yingmaili area and marine oils from the Tazhong uplift in the Tarim Basin were genetically classified. |
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| Keywords: | Mango's light hydrocarbon parameter (K1) geochemical characteristic crude oil Tarim Basin |
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