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为了调查煤层气生产区采出地层水中的重金属在露天排放下对生产区地表土壤的影响,采集生产监测区煤层气井产出地层水样、蓄水池积水样、蓄水池底泥样和井场周围地表土样进行重金属含量的测试分析,应用地质累积指数法和Hakanson潜在生态危害指数法对地表土壤的重金属污染程度和生态危害进行了评价。结果表明,煤层气生产区井场蓄水池底泥受到As、Cd、Sn的中度污染,周围地表土壤受到Cd、Sn的中度污染和As、Cr、Pb、Cu、Co的轻度污染,各重金属的污染程度由高到低为Sn、Cd、As、Pb、Cr、Co、Cu、Mn、Ni、Zn。煤层气生产区土壤中重金属存在中度的潜在生态风险,对煤层气生产区地表土壤生态环境产生潜在生态风险的最主要重金属是Cd。
In order to investigate the influence of heavy metals in formation water produced by CBM production area on the surface soil in the production area under open air discharge, the CBM wells in the production monitoring area were collected to produce formation water samples, water samples from reservoirs and sediment samples from reservoirs The soil samples around the wellsite were tested for heavy metal content. The methods of Geological Cumulative Index and Hakanson Potential Ecological Risk Index were applied to evaluate the degree of heavy metal pollution and ecological hazard of surface soils. The results show that the wellbore in well site of coalbed methane production area is moderately contaminated by As, Cd and Sn, and the surrounding surface soil is moderately contaminated by Cd and Sn and mildly contaminated by As, Cr, Pb, Cu and Co , The pollution levels of heavy metals from high to low as Sn, Cd, As, Pb, Cr, Co, Cu, Mn, Ni, Zn. The potential ecological risk of heavy metals in soils in coalbed methane production area is moderate, and the most important heavy metal in the potential ecological risk of surface soil ecological environment in coalbed methane production area is Cd.