中国煤层气产业存在南北方发展不平衡的客观情况，龙潭组煤层气作为西南地区非常规天然气的重要接替资源，现有地质甜点区优选及储层压裂改造技术制约了渝东南地区煤层气资源效益开发。为此，选择渝东南地区南川区块为研究对象，基于地震、钻井、测井、分析测试等资料，分析龙潭组煤层气地质条件，优选地质甜点区，提出了针对性的压裂工艺并应用于现场攻关实践。结果表明：① 该区含煤地层表现为煤层层数多，累积厚度大、含气性好的特点，但煤层非均质性强，水平主应力差大，常规压裂不足以形成长距离有效支撑裂缝，这是导致该区未取得煤层气突破的根本原因；② 形成了以“物质基础、保存条件、可压裂性”三元为核心的煤层气富集高产地质甜点评价体系，优选出C25煤层为纵向甜点段，中深层500～2 000 m甜点区面积219.2 km²，资源量385.3×10⁸ m³；③ 提出了以“强改造规模+大粒径支撑+多轮次施工”为核心的有效压裂改造思路，并在D1井成功应用，定向井单井稳定日产气量超过6 200 m³，实现了渝东南地区煤层气勘探重大突破。“三元控气”地质甜点评价和有效支撑压裂工艺相结合的地质工程一体化技术，为充分释放渝东南地区有利区煤层气资源进而实现整体效益开发提供了技术支撑。

The development of China’s coalbed methane (CBM) industry is unbalanced between the south and the north. As an important replacement resource in unconventional fields in southeast Chongqing, The beneficial exploitation of Longtan coalbed methane is restricted by the selection of existing geological sweet spots and reservoir fracturing reconstruction technology. Therefore, the Nanchuan block in southeast Chongqing is selected as the research object. Based on seismic, drilling, logging, analysis and testing data, the geological conditions of Longtan coalbed methane Formation are analyzed, the geological sweet spot area is optimized, and the targeted fracturing technology is proposed and applied to the field practice. The results show that: ① The coal-bearing strata in this area are characterized by multiple coal layers, large cumulative thickness and good gas bearing capacity. However, the basic reasons for the failure of coalbed methane breakthrough in this area are the strong heterogeneity of each coal seam and large horizontal stress difference coefficient, leaving conventional fracturing inadequate to form effective propping fractures over long distances. ② A geological sweet spot evaluation system of CBM enrichment and high-yield has been formed with three core elements of “material basis, preservation conditions and fracability”. The C25 coal seam was selected as the longitudinal sweet spot segment. The middle and deep sweet spot area of 500-2000 m was 219.2 km² with 385.3×108 m³ of resources. ③ It proposed an effective fracturing reconstruction idea with the core of “strong scale reconstruction + large particle size support + multiple rounds of construction”. This theory has been successfully applied in well D1, with a stable daily gas output of more than 6 200 m³ in a single directional well, achieving a major breakthrough in CBM exploration in southeast Chongqing. To sum up, the integrated idea of geological engineering, which combines the geological sweet spots evaluation based on the theory of CBM controlled by three factors with the effective support fracturing process, provides technical support for fully releasing CBM resources in favorable areas of southeast Chongqing and realizing overall benefit development.