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The quantitative identification of water sources is an important prerequisite for objectively evaluating the degree of aquifer interference and predicting the production potential of coalbed methane (CBM) wells. However, this issue has not been solved yet, and water sources are far from being completely understood. Stable water isotopes are important carriers of water source information, which can be used to identify the water sources for CBM wells. Taking the Zhijin block in the Western Guizhou Province as an example, the produced water samples were collected from CBM wells. The relationships between the stable isotopic compositions of the produced water samples and the production data were quantitatively analyzed. The following main conclusions were obtained. (1) The δD and δ18O values of the produced water samples were between −73.37‰ and −27.56‰ (average −56.30‰) and between −11.04&perm

United statesInstitute of geochemistryChinese academy of sciences guiyangKey laboratory of environmental geochemistryFinnigan incUpper permianWestern guizhouSouth chinaUpper permian longtan formationChangxing formationLower triassic feixianguan formationEmeishan basalt formationGroundwater stable isotopicWater sourcesShaopu riverThermo electron