天然气工业2026，Vol.46Issue(7)：12-21,10.DOI:10.3787/j.issn.1000-0976.2026.07.002
四川盆地筇竹寺组页岩气地质工程特征及开发先导试验成效
Geological and engineering characteristics and development pilot results of the Qiongzhusi Formation shale gas in the Sichuan Basin
摘要
Abstract
The Lower Cambrian Qiongzhusi Formation is the most strategically valuable shale gas replacement formation in the Sichuan Basin.However,its particular geological and engineering conditions differ markedly from those of the Longmaxi Formation which is currently in the stage of mature development,meaning that existing technical systems cannot be directly replicated.Focusing on the exploration appraisal wells and pilot horizontal wells in the Z201 wellblock and its adjacent areas in the Ziyang Region of the Sichuan Basin,this paper systematically compares the Qiongzhusi Formation with the Longmaxi Formation reservoirs,and then reveals the geological and engineering characteristics governing the development of Qiongzhusi Formation shale gas by making comprehensive use of seismic interpretation,image logging,fiber-optic monitoring,microseismic monitoring,fracturing and production performance data.The following results are obtained.First,influenced by high-angle natural fractures,a low Q value of 0.6-1.2,and a high Young's modulus of 35-50 GPa,the hydraulic fracture network in the Qiongzhusi Formation exhibits a fishbone-shaped propagation pattern,which differs from the H-shaped pattern commonly observed in the Longmaxi Formation.The Qiongzhusi Formation reservoirs are more heterogeneous.Second,casing program optimization and managed-pressure drilling technology significantly reduce drilling complexities,and supported by specific tools,improve the drilling efficiency,with the target drilling rate up to 96%-100%.Third,a quantitative classification scheme is established for three reservoir types,i.e.,matrix-dominated,vertically fractured,and laterally fractured reservoirs,and the corresponding differentiated fracturing technologies are then proposed.The Qiongzhusi Formation is superior to the Longmaxi Formation in terms of fracturing stimulation effectiveness,with the gas production per unit pressure drop approximately three times that of deep Longmaxi Formation.Fourth,the analysis on productivity controlling factors indicates that the thickness of high-quality reservoirs is the decisive basis for high yield.Under comparable geological conditions,an 11%increase in stimulation intensity can drive a 13%increase in EUR.In conclusion,the Qiongzhusi Formation holds great potential for the large-scale development of deep shale gas,and targeted drilling,optimized fracturing technologies and differentiated development strategies can effectively resolve the difficulties in deep reservoir development.The research findings provide a core technical reference for the large-scale,cost-effective development of the Qiongzhusi Formation.关键词
四川盆地/筇竹寺组/地质工程特征/先导试验/"丰"字形缝网/精准压裂/产能主控因素Key words
Sichuan Basin/Qiongzhusi Fm/Geological and engineering characteristics/Pilot test/"Fishbone-shaped"fracture network/Precision fracturing/Productivity controlling factors分类
能源科技引用本文复制引用
葛枫,曹梦娇,胡云鹏,赵圣贤,刘勇,张成林,张德良,郑马嘉,俞霁晨,马莅..四川盆地筇竹寺组页岩气地质工程特征及开发先导试验成效[J].天然气工业,2026,46(7):12-21,10.基金项目
油气重大专项项目"四川盆地深层页岩气效益开发技术与集成示范"(编号:2025ZD1405300)、中国石油天然气股份有限公司科技专项项目"页岩气规模增储上产与勘探开发技术研究"(编号:2023ZZ21). （编号:2025ZD1405300）
