大量低产低效煤层气井的存在严重制约了煤层气产能转化率和资源动用率的提高，亟需开展低效煤层气井成因解剖和有效治理。基于沁水盆地柿庄南区块1 000余口煤层气井的钻井、测井、录井、压裂、排采和实验测试数据,开展了低效井判识、成因分析和治理体系构建。研究结果表明：基于不同排采阶段，以产气量为主要参数，结合动液面高度、井底流压和排采时限可定义低效井；钻井、压裂和排采等过程均会对煤层气井产能造成不同程度的影响；基于构造、含气量、储层压力、渗透率等关键地质参数叠加和模糊评价圈定了4类（Ⅰ～Ⅳ)可改造地质单元，产能预测表明Ⅰ、Ⅱ、Ⅲ类具有良好的改造潜力；通过递阶优选构建了低效井成因解剖体系，划分了3大类13小类低效井形成类型；提出了地质-工程-排采一体化的低效井综合治理体系，保证资源和储层的有效性，促进缝网井筒的高效连通，做到科学排采和区域协同降压控制。

能提高煤层气单井产气量和产能转化率义。

The existence of extensive low-efficiency wells has serious negative impact on improving the coalbed methane (CBM) production conversion rate and resource utilization rate， which has made it urgent to analyze the causes of low-efficiency wells and carry out effective renovation.Based on well drilling， well measuring， logging， fracturing， drainage and experimental data of more than 1 000 CBM wells in Shizhuangnan Block of Qinshui Basin， this study was dedicated for low-efficiency well identifying， origin analyzing and renovation mechanism establishing.The study results prove that at different drainage stages， the low efficiency wells can be defined by setting gas production rate as the main index， combining parameters such as liquid level height， bottom hole flow pressure， and drainage time.And factors such as well drilling， fracturing and drainage processes can all affect the gas production efficiency in different degrees； Four classes of reconstructable geological type were determined based on key geological parameters such as superposition of tectonic， gas content， reservoir pressure and permeability and assists from fuzzy evaluation， and production capability prediction shows that classes of Ⅰ，Ⅱ and Ⅲare of good reconstructable potential.With the help from combing methods of hierarchical optimization， a mechanism for dissecting the origin of the low efficiency wells was constructed and the formation of low-efficiency wells was divided into three main types and 13 subtypes.Furthermore， we proposed a comprehensive renovation systems for low efficiency wells by combining geology， engineering and drainages， which could ensure the effectiveness for resource and reservoirs， enhance the high efficiency connection of fractures network， and achieve scientific drainage and regional cooperative depressurization.This study could have positive impact on improving CBM single well gas production and gas recovery rates.