Volume 49 Issue 6
Dec.  2021
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CHEN Xin, WU Peng, GAO Jixian, HU Weiqiang, DING Wangui, LI Yangbing, LIU Xueqing, MA Litao, LIU Cheng, KONG Wei, CAO Di, CHEN Jianqi, LI Yong. Geochemical characteristics of marine-continental transitional facies shale and shale gas in Linxing area[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(6): 12-23. DOI: 10.3969/j.issn.1001-1986.2021.06.002
Citation: CHEN Xin, WU Peng, GAO Jixian, HU Weiqiang, DING Wangui, LI Yangbing, LIU Xueqing, MA Litao, LIU Cheng, KONG Wei, CAO Di, CHEN Jianqi, LI Yong. Geochemical characteristics of marine-continental transitional facies shale and shale gas in Linxing area[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(6): 12-23. DOI: 10.3969/j.issn.1001-1986.2021.06.002
shu

Geochemical characteristics of marine-continental transitional facies shale and shale gas in Linxing area

  • 1.

    CNOOC Energy Technology-Drilling & Production Co., Tianjin 300452, China

  • 2.

    CNOOC Energy Technology & Services Limited Key Laboratory for Exploration & Development of Unconventional Resources, Tianjin 300452, China

  • 3.

    China United Coalbed Methane Corporation Ltd., Beijing 100011, China

  • 4.

    School of Geoscience and Surveying, China University of Mining and Technology(Beijing), Beijing 100083, China

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  • Received Date: May 09, 2021
  • Revised Date: July 22, 2021
  • Available Online: December 29, 2021
  • Published Date: December 24, 2021
    Graphical Abstract
    • Abstract
  • In order to reveal the geochemical characteristics of shale and shale gas on the east edge of Ordos Basin, thin section identification, full rock and clay content, scanning electron microscope, organic carbon, rock pyrolysis, kerogen macerals, and kerogen carbon isotopes were tested, and the gas component and carbon isotopes composition of shale were analyzed. The results show that the mineral component of the transitional facies shale in Linxing area is mainly quartz and clay minerals, containing a small amount of calcite, plagioclase, potassium feldspar, dolomite and pyrite. Affected by the mineral genesis and deposition environment, different mineral components and organic matter occur in different ways. There are two deposit patterns of quartz and organic matter, 3 patterns of clay minerals, and 4 patterns of pyrite. The organic matter type is Ⅱ2-Ⅲ type, the average organic carbon content is greater than 2.0%, and the kerogen carbon isotopes are from –24.5‰ to –23.2‰. The vitrinite reflectivity is from 0.92% to 1.30%, tmax is 427~494℃, and the thermal evolution of organic matter reaches maturity. In shale gas, hydrocarbon gas is mainly methane, containing a small amount of ethane and propane, which is generally dry gas. The mean methane carbon isotope is –40.0‰, between marine shale gas and terrestrial shale gas, ethane carbon isotopes from –26.8‰ to –22.56‰, both more than –29 ‰, showing δ13C1 < δ13C2 < δ13C3 positive carbon sequence. It is believed that the shale in the area has the potential to generate shale gas. The shale gas is mainly derived from humic shale in the upper Paleozoic boundary, which belongs to the organic thermal coal gas generated by the cracking of cheese root.
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