Based on water chemistry analyses of five batches of water product samples from eight coalbed methane (CBM) wells of the Songhe well group in the western Guizhou province in 2017, the single-factor index method, the Nemerow index method and the health risk assessment method were used to evaluate the environmental effects of the water product. The results show that the water co-product of the Songhe well group was characterized mainly by high Na⁺ and Cl⁻ concentrations, alkalinity, high total dissolved solids and Na–Cl water types. The concentrations of carcinogens (i.e., As, Cd and Cr) were low, but the non-carcinogen Ba was enriched abnormally. The single-factor index method and the Nemerow index method were used to evaluate the water co-product from the eight CBM wells, and the results show a serious pollution level of up to grade 5. The ions Na⁺, Cl⁻ and Ba²⁺ were the main sources of pollution. The pollution is more serious in the deeper part than in the shallow part of the well group. The health risk evaluation method was used to calculate the health risk index of carcinogenic factors (i.e., As, Cr, Cd) and non-carcinogenic factors (i.e., Pd, Fe, Cu, Zn, Mn, Hg, F, Ba). The results show that the spatial distribution regularity of these metals in the well group is weak. There were mainly two CBM wells with slight risk throughout the year. With increase in drainage time, the risk gradually decreased, but in the rainy season, the risk index increased abnormally to medium risk.

基于2017年贵州西部松河井群8口煤层气井的5批水产品样品的水化学分析，采用单因素指数法，Nemerow指数法和健康风险评估法被用来评估水产品的环境影响。结果表明，松河井组水副产物的主要特征是Na ⁺和Cl-高^。浓度，碱度，高总溶解固体和Na–Cl水类型。致癌物（As，Cd和Cr）的浓度较低，但非致癌物Ba异常富集。单因子指数法和内梅罗指数法被用来评价从八个煤层气井的水副产物，结果显示了一个严重的污染级别为5级中的离子的Na ⁺，氯^-和Ba ^{2 +}是主要的污染源 井组深部的污染比浅部的污染更严重。健康风险评估方法用于计算致癌因素（即As，Cr，Cd）和非致癌因素（Pd，Fe，Cu，Zn，Mn，Hg，F，Ba）的健康风险指数。结果表明，这些金属在井组中的空间分布规律性较弱。全年主要有两个煤层气井，风险较小。随着排水时间的增加，危险度逐渐降低，但在雨季，危险指数从异常上升到中等危险。