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Science in China Series D: Earth Sciences

, Volume 52, Issue 2, pp 213–226 | Cite as

Abiogenic hydrocarbons in commercial gases from the Songliao Basin, China

  • XianBin Wang
  • ZhanQian Guo
  • JinCai Tuo
  • HongYan Guo
  • ZhenXi Li
  • ShengGuang Zhuo
  • HongLiang Jiang
  • LongWei Zeng
  • MingJie Zhang
  • LianSheng Wang
  • ChunXue Liu
  • Hong Yan
  • LiWu Li
  • XiaoFeng Zhou
  • YongLi Wang
  • Hui Yang
  • Guang Wang
Article

Abstract

This paper discusses the kinetic fractionation, composition and distribution characteristics of carbon and hydrogen isotopes for various alkane gases formed in different environments, by different mechanisms and from different sources in nature. It is demonstrated that the biodegradation or thermodegradation of complex high-molecule sedimentary organic material can form microbial gas or thermogenic gas. The δ13C1 value ranges from −110% to −50% for microbial gases but from −50% to −35% (even heavier) for thermogenic gases. Controlled by the kinetic isotope fractionation, both microbial and thermogenic gases have δ13C and δ D values characterized by normal distribution, i.e. δ13C1< δ 13C2< δ 13C3< δ 13C4 and \( \delta D_{CH_4 } < \delta D_{C_2 H_6 } < \delta D_{C_3 H_8 } < \delta D_{C_4 H_{10} } \), and by a positive correlation between the δ 13C and δ D values. Simple carbon-bearing molecules (CH4, CO and CO2) can form abiogenic alkane gases via polymerization in the abiological chemical process in nature, with δ13C1 heavier than −30‰ Moreover, controlled by the kinetic isotope fractionation, abiogenic alkane gases are characterized by a reverse distribution of δ 13C values and a normal trend of δ D values, namely δ13C1> δ 13C2> δ 13C3> δ 13C4 and \( \delta D_{CH_4 } < \delta D_{C_2 H_6 } < \delta D_{C_3 H_8 } < \delta D_{C_4 H_{10} } \). The δ 13C values and δ D values are negatively correlated. Natural gases from 26 commercial gas wells distributed in the Xujiaweizi and Yingshan-Miaotaizi faulted depressions in the Songliao Basin, China, show δ13C1 values ranging from −30.5% to −16.7% with a very narrow δ D range between −203‰−196‰ These gases are characterized by a reverse distribution of δ 13C values but a normal distribution of δ C values, and a negative correlation between their δ 13C and δ C values, indicating an abiological origin. The present study has revealed that abiogenic hydrocarbons not only exist in nature but also can make significant contribution to commercial gas reserviors. It is estimated that the reserve volume of alkane gases with abiogenic characteristics in these 26 gas wells in the Songliao Basin is over 500×108 m3. The prospecting practice in the Songliao Basin has demonstrated that abiogenic alkane gases are of a promising resource, and it provides an example for the investigation of and search for abiogenic commercial natural gases worldwide.

Keywords

generation mechanism of natural gases kinetic isotope fractionation the Songliao Basin of China commercial abiogenic hydrocarbon gaspool 

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Copyright information

© Science in China Press and Springer-Verlag GmbH 2009

Authors and Affiliations

  • XianBin Wang
    • 1
  • ZhanQian Guo
    • 2
  • JinCai Tuo
    • 1
  • HongYan Guo
    • 1
  • ZhenXi Li
    • 1
  • ShengGuang Zhuo
    • 3
  • HongLiang Jiang
    • 2
  • LongWei Zeng
    • 2
  • MingJie Zhang
    • 4
  • LianSheng Wang
    • 2
  • ChunXue Liu
    • 2
  • Hong Yan
    • 1
  • LiWu Li
    • 1
  • XiaoFeng Zhou
    • 1
  • YongLi Wang
    • 1
  • Hui Yang
    • 1
  • Guang Wang
    • 1
  1. 1.Key Laboratory of Gas GeochemistryChinese Academy of SciencesLanzhouChina
  2. 2.Daqing Oilfield Company Ltd.DaqingChina
  3. 3.Institute of Earth Sciences and Information TechnologyNortheast University at QinhuangdaoQinhuangdaoChina
  4. 4.School of Earth and Environment SciencesLanzhou UniversityLanzhouChina

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