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基于沁水盆地柿庄南区块23口排采1年以上的煤层气井排采水水质分析数据及实测储层压力,采用Schoeller图、Piper图等分析了柿庄南煤层气井排采水地球化学特征及水动力分区特征,探讨了水文地质条件对煤层气富集的影响。研究表明柿庄南区块煤层气井排采水主要为Na—HCO_3水型,反映研究区处于开启—半封闭的水文地质环境;排采水氢氧同位素值均位于全国大气降水线附近,排采水初始来源主要为大气降水;利用折算水位将研究区大致划分为西北部径流区、南部弱径流区及中部过渡带滞流区,水流从西北部和南部向中部滞流区汇聚,水化学参数反映出滞流区煤层气保存条件好于两侧径流区和弱径流区。基于水化学场和水动力场参数建立了煤层气富集区优选指标体系,优选出煤层气富集有利区和较有利区,对下一步煤层气井布置具有指导作用。
Based on the data of water quality analysis of coalbed methane well produced from 23 wells in Shizhuangnan block of Qinshui Basin for more than one year and the measured reservoir pressure, Schoeller plot and Piper plot were used to analyze the water-bearing geochemistry Characteristics and hydrodynamic zoning characteristics of the impact of hydrogeological conditions on the enrichment of coalbed methane. The research shows that the drainage water of coalbed methane wells in the Shizhuangnan block is mainly Na-HCO_3 water type, which indicates that the study area is in an open-semi-closed hydrogeological environment. The hydrogen and oxygen isotope values of the drainage water are all located near the national precipitation precipitation line, The initial source of water is mainly precipitation. The studied area can be roughly divided into the northwest runoff region, the southern weak runoff region and the middle transitional region stagnant region. The water flow converges from the northwestern and southern regions to the central stagnant region. The water chemistry parameters The results show that the CBM storage conditions in stagnant area are better than those in both runoff and weak runoff areas. Based on the parameters of hydrous chemical field and hydrodynamic field, the optimal index system of CBM enrichment zone was established, and the favorable CBM enrichment zone and favorable zone were selected, which played a guiding role in the next CBM well layout.