Volume 48 Issue 4
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WANG Xiangye, SUN Baoping. Geochemical characteristics and their origin of CBM in Xingxian area, Ordos basin[J]. COAL GEOLOGY & EXPLORATION, 2020, 48(4): 156-164,173. DOI: 10.3969/j.issn.1001-1986.2020.04.022
Citation: WANG Xiangye, SUN Baoping. Geochemical characteristics and their origin of CBM in Xingxian area, Ordos basin[J]. COAL GEOLOGY & EXPLORATION, 2020, 48(4): 156-164,173. DOI: 10.3969/j.issn.1001-1986.2020.04.022
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Geochemical characteristics and their origin of CBM in Xingxian area, Ordos basin

  • Xi'an Research Institute Co. Ltd., China Coal Technology & Engineering Group Crop., Xi'an 710077, China

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Science and Technology Innovation Fund of Xi'an Research Institute of CCTEG(2019XAYMS20)

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  • Received Date: January 11, 2020
  • Revised Date: February 13, 2020
  • Published Date: August 24, 2020
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    • Abstract
  • The distribution of carbon and hydrogen isotope of methane is of signification in revealing the origin, the distribution of CBM reservoir, and the source evaluation of CBM. To study the origins of coalbed methane and carbon dioxide, the data of the components、carbon and hydrogen isotopes of CBM from the desorption gas of coal core from Xingxian area were analyzed. With the CBM origins chart board, and the geological environment, the geological effect of the formation and the evolution of CBM were analyzed. the ratios of CBM with different origins were estimated. The results show that the δ13C, values of CH4 in coal seams 8 are between -55.1‰ and -44.2‰, with an average of -49.2‰; the δ13C1 values of CH4 in coal seams 13 are between -65.7‰ and -55.7‰, with an average of -59.8‰. The carbon isotopes of CH4 of the same coal seam were characterized by increase with the buried depth and decrease with the hydrodynamic conditions. The methane carbon isotope values were obviously lighter and the heavy hydrocarbon component were less, which show the gas was influenced by some factors and secondary transformation. Tectonic-thermal history and geological conditions of coal seams show that the forming conditions of secondary biogenic gas were found, and the biogas was generated by the reduction of CO2. The δ13C values of CO2 in coal seams 8 are between -17.3‰ and -4.8‰, the δ13C values of CO2 in coal seams 13 are between -26.3‰ and -6.9‰, the CO2 could be generated from thermal degration or thermal cracking or both at the early stage of coalification or after the latest coal seam uplift. This study provides a theoretical basis for the direction of coalbed methane exploration and development in this area.
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