Coalbed methane wells in the Shizhuangnan Block exhibit significant productivity differences. The reasons were determined based on the impact analysis of geological factors and drainage strategies on production capacity at 82 wells. Grey relational analysis was further utilized to quantitatively analyze the correlation degree of geological parameters to production characteristics. It is found that the main reason for wells with high water production is the ingress of external water, i.e. connecting adjacent aquifer by natural faults or artificial fractures. And aquifer characteristics, especially thickness of aquifer has the greatest influence on the water production, followed by pore connectivity, porosity, and shale content. For the wells that have not been affected by external water, the gas productivity differences are mainly affected by reservoir conditions and drainage strategies. Finally, an analytical process was proposed to provide theoretical support for rational production of coalbed methane wells.

中文翻译：

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沁水盆地南部石庄南区块煤层气垂直井产能差异及影响因素分析

石庄南区块煤层气井产能差异显着。原因是根据地质因素和排水策略对82口井产能的影响分析确定的。进一步利用灰色关联分析定量分析地质参数与生产特征的相关程度。研究发现，井高产水的主要原因是外部水的进入，即通过天然断层或人工裂缝连接相邻的含水层。而含水层特征，尤其是含水层厚度对产水量的影响最大，其次是孔隙连通性、孔隙度和页岩含量。对于未受外来水影响的井，天然气产能差异主要受储层条件和排采策略影响。最后提出分析流程,为煤层气井合理生产提供理论支持。