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Article Navigation >  Journal of Mining Science and Technology  > 2017  >  2(2): 99-108
Xu Hongwei, Li Xianqing, Zhou Baogang, Yang Jie, Zhang Wei, Wang Zhe, Gao Wenjie. Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration area[J]. Journal of Mining Science and Technology, 2017, 2(2): 99-108.
Citation: Xu Hongwei, Li Xianqing, Zhou Baogang, Yang Jie, Zhang Wei, Wang Zhe, Gao Wenjie. Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration area[J]. Journal of Mining Science and Technology, 2017, 2(2): 99-108.
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Geochemical characteristics and genesis of the Yanchang Formation terrestrial shale gas in the Yanchang exploration area

  • 1.

    State Key Laboratory of Coal Resources and Safe Mining,Beijing 100083,China;2.College of Geoscience and Surveying Engineering,China University of Mining and Technology,Beijing 100083,China

  • Received Date: 2016-10-08
  • Publish Date: 2017-04-29
    Abstract
  • Through analyzing the gas composition and isotopes of carbon and hydrogen of the shale gas samples,the geochemical characteristics of the upper Triassic Yanchang Formation shale from the Yanchang exploration area in the southeastern Ordos basin were studied.The genesis and source of the Yanchang Formation shale gas in the Yanchang exploration area were also discussed.The results show that:①Shale gas of Yanchang Formation in the Yanchang exploration area mainly consist of hydrocarbon gases (87.89%~99.66%),with methane content less than 95% (60.44%~91.68%),high content of heavy hydrocarbon component,relatively lower dry coefficient（64.00%~93.43%）,and low non-hydrocarbon gases content (mainly N2 and CO2,0.68% and 1.36%,respectively ),belongs to typical wet gas.②The carbon isotope values of methane,ethane,propane and butane of Yanchang Formation shale gas in the Yanchang exploration area are mainly distributed in -53.4‰~-46.3 ‰,-39.7 ‰~-31.9 ‰,-34.3 ‰~-29.6 ‰ and -33.8 ‰~-25.0 ‰.The carbon isotope of Yanchang Formation shale gas in the Yanchang exploration area is mainly characterized by δ13C1<δ13C2 <δ13C3 <δ13C4.Only a small number of samples of the δ13C3 and δ13C4 are reversal.③Shale gas of Yanchang Formation in the Yanchang exploration area is dominated by thermogenic gas,mainly oil type gas formed by kerogen cracking that from the lowmature and mature stage of the partial sapropel type shale.
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