Stable carbon isotopic compositions of individual light hydrocarbons in the C-5-C-7 range in natural gas from the Qaidam Basin, China

Zhang Chen; Zhang Daoyong; Ma WenliChen KefeiLi JingZhou Shixin

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Stable carbon isotopic compositions of individual light hydrocarbons in the C-5-C-7 range in natural gas from the Qaidam Basin, China

机译：Stable carbon isotopic compositions of individual light hydrocarbons in the C-5-C-7 range in natural gas from the Qaidam Basin, China

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C-5-C-7 light hydrocarbons are important components in petroleum and are extensively employed as an auxiliary approach in petroleum research. Consensus on the mechanism of light hydrocarbon generation has not yet been achieved. In this study, 20 gas samples were collected from the western part and northern margin of the Qaidam Basin. The molecular and carbon isotopic compositions of C-1-C-3 gaseous hydrocarbons and C-5-C-7 light hydrocarbons, as well as the carbon isotopes of oils were analyzed. Based on the relationships between carbon isotopes (C-13) of individual light hydrocarbons and calculated vitrinite reflectance, it suggests that organic matters play a fundamental role in the carbon isotopes of light hydrocarbons, and maturity mainly affects the carbon isotopes of n-alkanes in light hydrocarbons. In addition, carbon isotopic differences between n-, iso- and cyclo-alkanes indicate that light hydrocarbons with different structures are produced from various biological precursors. Besides, carbon isotopes of individual light hydrocarbons can be used to estimate the delta C-13(kerogen) and distinguish cracked gas. On the one hand, small isotope fractionation between iso-alkanes and kerogen is observed. Average carbon isotopic compositions of iso-pentane (i-C-5), 2-methylpentane (2-MC5) and 3-methylpentane (3-MC5) can provide a similar delta C-13(kerogen) with actual values. On the other hand, the carbon isotopic difference between 2-MC5 and n-C-6 generally decreases with increasing maturity. Combined with the parameter (2-MC6 + 3-MC6)/n-C-6, kerogen-cracked gases are characterized by high delta C-13(2MC5)-delta C-13(nC6) and low (2-MC6 + 3-MC6)/n-C-6 values, whereas oil-cracked gases exhibit the opposite features.

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来源
《Energy exploration & exploitation》 |2023年第4期|1209-1227|共19页
作者
Zhang Chen; Zhang Daoyong; Ma WenliChen KefeiLi JingZhou Shixin;
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作者单位

PetroChina;

Chinese Acad Sci;

Chinese Acad Sci||Chinese Acad Sci;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
C-5-C-7 light hydrocarbon; individual carbon isotope; natural gas; genesis; source estimation; cracked gas;

Stable carbon isotopic compositions of individual light hydrocarbons in the C-5-C-7 range in natural gas from the Qaidam Basin, China

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