YANG Mei1, JU Yiwen2, *, LIU Guijian3, TONG Li4, 5, KANG Yu3 and HOU Quanlin2
1 College of Resources and Environment, University of Chinese Academy Sciences, Beijing 100049, China;2 Key Lab of Computational Geodynamics of Chinese Academy of Sciences, College of Earth Science, University of Chinese Academy Sciences, Beijing 100049, China;3 School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;4 Research Center for Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, Chinap5 University of Chinese Academy Sciences, Beijing 100049, ChinaThis research was funded by the National Science and Technology Major Project (2011ZX05060-005; 2009ZX05039-003).
To reveal the geochemical characters of water coproduced with coalbed gas and shallow groundwater, water samples were collected from 12 wells of coalbed methane and 7 wells of shallow groundwater. The pH, CODMn, fCO2, total dissolved solids (TDS), total hardness, and concentrations of metasilicic acid, sodium and kalium, calcium ion, magnesium ion, ammonium iron, bicarbonate ion, carbonate, chloride, sulfate ion, nitrate ion, fluoride, lithium, zinc, nickel, manganese, iron, boron, barium, etc. of the samples were measured. Research results showed the following: (1) Concentrations of TDS, chloride, fluoride, sodium and kalium, ammonium, iron, and barium in the water coproduced with coalbed gas exceeded the national standards of China; however, physical, chemical, and biological properties of shallow groundwater could meet the national standard. (2) The water produced from coalbed contained mainly Na–Cl·HCO3, with average TDS of 4588.5 ppm, whereas shallow groundwater contained a mixture of chemicals including Na·Mg·Ca-HCO3·SO4 and Na·Mg-HCO3·SO4, with average TDS of 663.8 ppm. (3) In general, it was observed that bicarbonate and sodium accumulated in a reducing environment and deeper system, while depletion of hydrogen ions and dissolution of sulfate, calcium, and magnesium occurred in a redox environment and shallow system. (4) Sodium and kalium, ammonium, chloride, and bicarbonate ions were the main ions found in the study area.
To reveal the geochemical characters of water coproduced with coalbed gas and shallow groundwater, water samples were collected from 12 wells of coalbed methane and 7 wells of shallow groundwater. The pH, CODMn, fCO2, total dissolved solids (TDS), total hardness, and concentrations of metasilicic acid, sodium and kalium, calcium ion, magnesium ion, ammonium iron, bicarbonate ion, carbonate, chloride, sulfate ion, nitrate ion, fluoride, lithium, zinc, nickel, manganese, iron, boron, barium, etc. of the samples were measured. Research results showed the following: (1) Concentrations of TDS, chloride, fluoride, sodium and kalium, ammonium, iron, and barium in the water coproduced with coalbed gas exceeded the national standards of China; however, physical, chemical, and biological properties of shallow groundwater could meet the national standard. (2) The water produced from coalbed contained mainly Na–Cl·HCO3, with average TDS of 4588.5 ppm, whereas shallow groundwater contained a mixture of chemicals including Na·Mg·Ca-HCO3·SO4 and Na·Mg-HCO3·SO4, with average TDS of 663.8 ppm. (3) In general, it was observed that bicarbonate and sodium accumulated in a reducing environment and deeper system, while depletion of hydrogen ions and dissolution of sulfate, calcium, and magnesium occurred in a redox environment and shallow system. (4) Sodium and kalium, ammonium, chloride, and bicarbonate ions were the main ions found in the study area.
YANG Mei, JU Yiwen, *, LIU Guijian, TONG Li, KANG Yu and HOU Quanlin.2013. Geochemical Characters of Water Coproduced with Coalbed Gas and Shallow Groundwater in Liulin Coalfield of China[J]. ACTA GEOLOGICA SINICA(English edition),87(6):1690~1700
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