工程地质学报2016，Vol.24Issue(5)：992-1007,16.DOI:10.13544/j.cnki.jeg.2016.05.031
不同尺度岩体结构面对页岩气储层水力压裂裂缝扩展的影响
INFLUENCE OF DIFFERENT SCALES OF STRUCTURAL PLANES ON PROPAGATION MECHANISM OF HYDRAULIC FRACTURING
摘要
Abstract
In shale gas reservoirs,natural rock mass structural planes usually have significant influences on hydraulic fracturing treatment.This study uses the RFPA2D-Flow program.It considers the coupling seepage-stress-failure process of crack initiation,propagation,and damage.It simulates hydraulic fracturing process of rock mass in heterogeneous rock mass with different scales of natural structural planes.Though numerical simulation and discussion,the main conclusions can be drawn as follows:(1 )When a hydraulic fracture encounters a natural unclosed crack,the principal stress trajectories would be deflected and a tensile stress zone would be created between the hydraulic fracture and the natural crack due to the increased pore pressure and propagation of the hydraulic fracture.Thus,the emergence and coalescence of tensile failure of the micro-units eventually causes the connection between the hydraulic fracture and the natural crack.(2)Bedding planes have pronounced effects on hydraulic fracturing.When the strikes of the maximum principal stress and the bedding planes intersect at a small angle,the bedding planes control the propagation of the hydraulic fractures.Otherwise,both the maximum principal stress and the bedding planes dominate the expansion of the fracture network.In addition,with the increase in structural planes and differential stresses,the scope and complexity of the stimulated fracture network increase simultaneously.(3)Hydraulic fracturing treatment is a short dynamic damage process.Although the existing of a fault structure can greatly affect the propagation model of the hydraulic fracturing and enhance the growth height of the hydraulic fracture,the damage to fault sealing capacity and activity caused by hydraulic fracturing is still limited compared with the depth of the reservoir.关键词
页岩气/水力压裂/结构面/断层/裂缝网络Key words
Shale gas/Hydraulic fracturing/Structural plane/Fault/Fracture network分类
能源科技引用本文复制引用
赵海军,马凤山,刘港,郭捷,冯雪磊..不同尺度岩体结构面对页岩气储层水力压裂裂缝扩展的影响[J].工程地质学报,2016,24(5):992-1007,16.基金项目
中国科学院战略性先导科技专项（B 类）（XDB10030602），国家自然科学基金项目（41372325，41372323，41402280）资助． （）
