Hydrochemistry feld characteristic of 11# coal seam in Hancheng CBM feld and its controlling effect on CBM

doi:10.3969/j.issn.1672-7703.2018.03.009

Abstract

Abstract: The change laws of hydrochemistry components of 11# coal seam in Hancheng coalbed methane (CBM) feld were investigated. It is determined that there are four types of coal seam water in this feld, including NaHCO₃ type water (salinity lower than 1000 mg/L) dominated by fresh water leaching, NaHCO₃ type water (salinity 1000-3000 mg/L) dominated by mixing, Na₂SO₄ type water (salinity 3000-10000 mg/L) dominated by lixivation and CaCl₂ type water (salinity higher than 10000 mg/L) dominated by concentration. Then, combined with structural characteristics, the hydrochemistry feld was divided into four zones, including HCO₃-Na Zone, HCO₃-Cl-Na zone, SO₄-Cl-Ca-Na zone and Cl-Na zone. Finally, the relationships of hydrochemistry feld of 11# coal seam vs. CBM content and CBM well productivity were studied. It is indicated that it is favorable for CBM enrichment in Cl-Na zone and the CBM well productivity is good. In HCO₃-Na zone, however, it is not favorable for CBM enrichment and the CBM well productivity is poor.

Key words: hydrochemistry feld, coal seam water, water type, coalbed methane, Hancheng

CLC Number:

Li Jian, Che Yanqian, Xiong Xianyue, Wang Wei, Li Tao, Wang Chengwang, Hu Huanyu. Hydrochemistry feld characteristic of 11# coal seam in Hancheng CBM feld and its controlling effect on CBM[J]. China Petroleum Exploration, 2018, 23(3): 74-80.

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