Volume 49 Issue 2
Apr.  2021
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LI Yangbing, ZENG Lei, HU Weiqiang, CHEN Xin, MA Litao, LIU Cheng, HUANG Ying, QIAO Fang. Geochemical characteristics and genesis of coalbed methane in Baode area[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(2): 133-141,151. DOI: 10.3969/j.issn.1001-1986.2021.02.017
Citation: LI Yangbing, ZENG Lei, HU Weiqiang, CHEN Xin, MA Litao, LIU Cheng, HUANG Ying, QIAO Fang. Geochemical characteristics and genesis of coalbed methane in Baode area[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(2): 133-141,151. DOI: 10.3969/j.issn.1001-1986.2021.02.017
shu

Geochemical characteristics and genesis of coalbed methane in Baode area

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

  • 2. Chongqing Academy of Ecological and Environmental Science, Chongqing 401147, China;

  • 3. Chongqing Engineering Research Center of Contaminated Sites and Groundwater Environment Sustainable Remediation, Chongqing 401147, China

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  • Received Date: July 11, 2020
  • Published Date: April 24, 2021
    Graphical Abstract
    • Abstract
  • In order to find out the geochemical characteristics and origins of coalbed methane(CBM)in Baode area, coal, CBM and water samples were collected, gas component analysis, quality detection of CBM well-produced water and stable isotope analysis were carried out. The results show that CH4 is the main hydrocarbon gas in CBM composition and its volume fraction ranges from 88.60% to 97.59%; a small amount of ethane is contained, and the volume fraction is only 0.01%-0.14%. The drying coefficient is greater than 0.99, the CBM belongs to the extremely dry CBM. The non-hydrocarbon components mainly contain CO2 and N2, of which the CO2 volume fraction ranges from 1.74% to 7.61% and N2 volume fraction ranges from 0.04% to 8.18%. CBM δ13C(CH4) value is between –56.8‰ and –47.7‰, the δ13C(CO2) value lies between –6.6‰ and 13.9‰, the δD(CH4) value is between –252.6‰ and –241.6‰.The water produced from coal seam is weakly alkaline, belonging to NaHCO3 type water, which is similar to the ion composition, salinity, value of δD(H2O) and δ18O(H2O) of surface water, and the recharge from surface water is conducive to the proliferation of CH4-producing bacteria and the formation of secondary biogas. It is generally believed that CBM in the study area is a mixture of thermal and biogenic gas, formed mainly through carbon dioxide reduction, and “lightened” due to coal seam desorption, diffusion and migration, water dissolution and secondary biological action. The research results provide guidance for subsequent CBM exploration and development.
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