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煤层气井产出水环境效应及其成因:以黔西松河区块GP井组为例
秦彬超, 杨兆彪, 高为
PDF(1969 KB)
PDF(1969 KB)
煤层气井产出水环境效应及其成因:以黔西松河区块GP井组为例
Environmental Effects and Causes of Produced Water in Coalbed Methane Wells：Taking GP Well Cluster in Songhe Block of Western Guizhou as an Example
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随着煤层气产业的规模化发展，煤层气井产出水的环境效益备受重视.以贵州西部松河井组8口煤层气试验井为例，动态跟踪了2018年5批次产出水的地球化学数据，采用模糊综合评价法和单因素分析法进行了产出水环境效应评价并进行成因分析，得出以下结论：松河井组煤层气产出水地球化学特征主要表现为Na+、HCO3 ‒、Cl‒浓度高，矿化度较高，产出水型为Na-Cl和Na-HCO3-Cl.本文采用模糊综合评价法计算得出8口煤层气试验井产出水均属于Ⅴ级重度污染，并得出主要污染指标为TDS、Na+以及Cl‒，F元素、Mn元素轻微超标，在此基础上进行单因子分析，评价结果为重度污染.综合2种评价方法得出主要污染指标为TDS、Na+、Cl‒以及Ba2+.污染程度在一定范围内随时间变化表现出轻微波动且具有微弱的降低趋势，研究区煤层气井产出水污染等级高且随时间变化而波动变化，是地质因素、工程因素叠加影响的耦合结果.煤系地层中各种元素富集的高地质背景为根本影响因素，控制着微量元素的种类和含量，其次压裂液返排率的变化对其有显著影响作用，季节性降水则加强水岩作用，促进了元素的溶出.
With the large-scale development of coalbed methane industry, the environmental effects of produced water from coalbed methane wells receive more attention. Taking 8 coalbed methane test wells in Songhejing Formation in western Guizhou as an example, the geochemical data of 5 batches of produced water in 2018 were tracked dynamically, and the environmental effects of produced water were evaluated by fuzzy comprehensive evaluation method and single factor analysis method, and the causes were analyzed. The following conclusions were drawn: The geochemical characteristics of coalbed methane produced water in Songhejing Formation are mainly characterized by high concentration of Na+, HCO3 ‒ and Cl‒ and high salinity, and the produced water types are Na-Cl and Na-HCO3 ‒. In this paper, the fuzzy comprehensive evaluation method is used to calculate that the produced water of eight coalbed methane test wells belongs to grade V heavy pollution, and the main pollution indicators are TDS, Na+ and Cl‒, and the elements F and Mn slightly exceed the standard. On this basis, the single factor analysis shows that the evaluation result is heavy pollution. Two comprehensive evaluation methods show that the main pollution indicators are TDS, Na+, Cl‒ and Ba2+. In a certain range, the pollution degree fluctuates slightly with time and has a weak decreasing trend. The water pollution level of coalbed methane wells in the study area is high and fluctuates with time, which is the coupling result of the superposition of geological factors and engineering factors. The high geological background of various elements enrichment in coal measures strata is the fundamental influencing factor, which controls the types and contents of trace elements. Secondly, the change of fracturing fluid flowback rate has a significant effect. Seasonal precipitation strengthens the water-rock effect and promotes the dissolution of elements.
贵州西部 / 煤层气井产出水 / 环境效应 / 模糊综合评价 / 成因分析 / 地球化学
western Guizhou / produced water from coalbed methane wells / environmental benefits / fuzzy comprehensive evaluation / grey correlation evaluation / geochemistry
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