基于微地震监测的长宁区块页岩气水平井压裂效果评估  

Evaluating hydraulic-fracture effectiveness in Changning shale gas block from microseismic monitoring

作　　者：胡俊杰 宋毅 朱炬辉 周小金 邓琪 梅花浪雪 HU Junjie;SONG Yi;ZHU Juhui;ZHOU Xiaojin;DENG Qi;MEI Hualangxue(Shale Gas Research Institute of PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610056,China;Downhole Operation Company of CNPC Chuanqing Drilling Engineering Co.,Ltd.,Chengdu,Sichuan 610066,China;Engineering Technology Department of PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610056,China;Exploration and Development Research Institute of PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China;Key Laboratory of Shale Gas Evaluation and Extraction,Chengdu,Sichuan 610056,China)

机构地区：[1]中国石油西南油气田公司页岩气研究院,四川成都610056 [2]中国石油川庆钻探工程有限公司井下作业公司,四川成都610066 [3]中国石油西南油气田公司工程技术部,四川成都610056 [4]中国石油西南油气田公司勘探开发研究院,四川成都610041 [5]页岩气评价与开采四川省重点实验室,四川成都610056

出　　处：《油气井测试》2025年第1期35-42,共8页Well Testing

基　　金：国家自然科学基金企业联合重点支持项目“页岩气藏体积压裂缝网表征及复杂裂缝动态交互机理研究”(U23B20156);中国石油天然气股份有限公司科技专项“非常规储层改造关键技术研究—页岩气复杂防控及高效压裂技术与试验”(2023ZZ28YJ05)。

摘　　要：针对长宁区块页岩气天然裂缝预测和地应力预测等成果图的预测精度验证和深化的问题,选取50口页岩气水平井的井下微地震监测数据进行系统分析。通过不同地质和压裂工艺条件下微地震响应特征及其与气井产能关系,开展水力裂缝的扩展规律预测并评价压裂工艺和压裂效果。结果表明,天然裂缝发育储层更易产生大能级事件点,且微地震事件点方位易沿曲率异常走向展布;同时,储层高应力特征不利于水力裂缝扩展,储层体积改造难度大。为了达到更好的储层体积改造效果,采用段内多簇压裂工艺更能激活近井区域内的天然裂缝,增加缝网的复杂程度。依据该研究结果形成了一套适应川南页岩气井的微地震监测压后评估方法,对今后页岩气开发技术优化、压裂工艺调整提供了有力支撑。Although prediction maps of natural fractures and geostress in this block have been formed,there is still much content that needs further research and verification.The underground microseismic monitoring data of 50 shale gas horizontal wells in Changning block were selected for unified and systematic analysis in this research.Through the relationship between microseismic response characteristics and different geological conditions,fracturing techniques,gas well productivity,the breaking and developing rules of hydraulic fractures were effectively predicted,fracturing effects were evaluated.The research results indicate that natural fractured reservoirs are more prone to generating large energy level event points,and the orientation of microseismic event points is easily distributed along the direction of curvature anomalies of natural fracture.At the same time,the high stress characteristics of the reservoir are not conducive to the expansion of hydraulic fractures,and the volume transformation of the reservoir is difficult.In order to achieve better reservoir volume transformation effects,the use of multi-cluster fracturing technology within the well section can activate natural fractures in the near wellbore area and increase the complexity of the fracture network.Based on the research results,a set of microseismic monitoring methods of post-fracturing effect evaluation suitable for shale gas wells in southern Sichuan shale gas field has been developed,providing strong support for optimizing shale gas development technology and adjusting fracturing techniques in the future.

关 键 词：四川盆地南部 长宁区块 页岩气水平井 微地震监测技术 水力压裂 缝网复杂程度 压裂效果评估 气井产能 

分 类 号：TE377[石油与天然气工程—油气田开发工程]