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Geochemical characteristics and origin of light hydrocarbons in biogenic gas

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Abstract

The light hydrocarbon geochemical characteristics of biogenic gases from Sebei 1 gas field in the Qaidam Basin, Baoshan gas field in the Baoshan Basin and Alaxin gas field, Puqian gas pool, Aonan gas pool in the Songliao Basin are studied and the origin is discussed based on the composition and isotope data of gases. The isoalkane contents among light hydrocarbons in natural gas show a negative relationship with δ13C1 values. The isoalkane contents of the gases with δ13C1 values of less than −60‰ are also high with more than 40% among light hydrocarbons in Sebei 1 gas field and Puqian gas pool. Moreover, the 2,2-dimethylbutane and 2-methylpentane, mainly sourced from bacteria, have predominance among isoalkanes, which suggests that light hydrocarbons in biogenic gases from these gas fields or pools were probably generated by microbial action. However, the cycloalkane contents among light hydrocarbons in biogenic gas are related to δ13C1 values positively. In Alaxin gas field and Aonan gas pool, where δ13C1 values of biogenic gases are less than −60‰, the average contents of cycloalkane are higher than 44%. Light hydrocarbons among biogenic gases from these gas fields were probably generated by catalysis. The isoalkane and cycloalkane contents among light hydrocarbons from biogenic gases in the Baoshan gas field are both high, which might be generated by these two actions. The results show that the data of light hydrocarbons in biogenic gas can provide important information for understanding the generation mechanisms of light hydrocarbons during geological evolution and identifying biogenic gas and low mature gas.

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Authors and Affiliations

  1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing, 100083, China

    GuoYi Hu, Chun Yang, YunYan Ni & XiaoWan Tao

  2. China Petroleum University, Beijing, 102249, China

    GuoYi Hu

  3. Research Institute of Petroleum Exploration & Development (Langfang), PetroChina, Langfang, 065007, China

    Xia Luo, ZhiSheng Li, Ying Zhang & Jin Li

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  1. GuoYi Hu
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  2. Xia Luo
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Correspondence to GuoYi Hu.

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Hu, G., Luo, X., Li, Z. et al. Geochemical characteristics and origin of light hydrocarbons in biogenic gas. Sci. China Earth Sci. 53, 832–843 (2010). https://doi.org/10.1007/s11430-010-3072-6

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  • DOI: https://doi.org/10.1007/s11430-010-3072-6

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