摘要
水力压裂是目前中国构建页岩油气储层复杂裂缝网络的主要技术之一,而页岩储层内部矿物组分差异以及不连续界面(层理、天然裂缝)的广泛分布使其具有强烈的非均质性,直接影响并制约了储层水力压裂改造效果。基于页岩微观矿物组分非均质性和宏观结构非均质性2方面,系统阐述了水力压裂裂缝扩展形态的研究进展。首先,分析了矿物组分差异引起的脆性程度对水力压裂裂缝扩展形态的影响;其次,总结了影响水力压裂裂缝与天然裂缝相互作用模式的关键地质因素和工程因素,探讨了水力压裂裂缝与天然裂缝相互作用机制;最后,研究了页岩层理对水力压裂裂缝穿层扩展的影响机理,阐述了层理面倾角、胶结强度及密度等关键参数对层理面开裂、水力压裂裂缝穿层和扩展形态的影响规律。综述了现阶段非均质性页岩水力压裂研究中存在的问题及发展趋势,为压裂设计优化提供了重要的理论依据。
Hydraulic fracturing techniques have been widely used in China to create complex fracture networks in shale reservoirs,while shale reservoirs exhibit high heterogeneity due to the difference in mineral compositions and the widespread presence of discontinuous interfaces(beddings and natural fractures),which directly affects and constrains the hydraulic fracturing effects in reservoirs.Based on the heterogeneity of microscopic mineral composition and macroscopic structure of shale,the research progress of fracture propagation patterns of hydraulic fracturing is systematically described.Firstly,the impact of brittle degree caused by mineral composition differences on the fracture propagation patterns of hydraulic fracturing is analyzed.Secondly,the key geological and engineering factors affecting the interaction modes between fractures by hydraulic fracturing and natural fractures are summarized,and the interaction mechanisms between fractures by hydraulic fracturing and natural fractures are discussed.Finally,the influence mechanisms of shale bedding on the fracture propagation of hydraulic fracturing is studied,and the influence law of key parameters such as bedding plane inclination,cementation strength,and density on the bedding plane cracking and fracture penetration and propagation patterns of hydraulic fracturing is expounded.This paper reviews the existing problems and development trends in the research on hydraulic fracturing of heterogeneous shale and provides an important theoretical basis for the optimization of fracture design.
作者
魏海峰
WEI Haifeng(Development Planning Department,SINOPEC,Beijing City,100000,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2023年第4期156-166,共11页
Petroleum Geology and Recovery Efficiency
关键词
非均质性
矿物组分
天然裂缝
层理面
水力压裂
heterogeneity
mineral composition
natural fractures
bedding plane
hydraulic fracturing
