桂林理工大学学报2017，Vol.37Issue(3)：531-535,5.DOI:10.3969/j.issn.1674-9057.2017.03.022
致密储层压裂缝网渗透性变异的影响因素分析
Influence factors of the permeability variation of fracture network caused by fracking in tight reservoir
摘要
Abstract
Shale reservoir permeability is one of the most important indicators in shale gas development.Reservoir permeability is bound to change with the decrease of reservoir pressure and pore pressure during the process of shale gas extraction.This analysis aims to the mechanism of microporous pore shrinkage effect and the gas slip effect on the shale reservoir permeability from the microscopic level.From the macroscopic level,the influence mechanism of creep deformation of shale gas reservoir,creep deformation of fracture surface and reservoir attenuation stress changes on fractured network permeability were analyzed.The results show that the matrix shrinkage effect and gas slip effect caused by shale gas desorption in microporous pore will increase the permeability of fractured reservoir to some extent,but the effect of matrix shrinkage on the permeability of reservoir rocks is relatively very weak.Yet,the effect of gas slippage could obviously increase the permeability of shale gas reservoir under low reservoir pressure.Reservoir hydraulic stimulation can greatly increase the fragmentation degree and water content of shale gas reservoir.Thus,the long-term creep deformation of the fractured rock mass will greatly compress the space of fracture aperture and reduce their permeability.In addition,the closure creep deformation of cracks associated with reservoir pressure reduction and formation compaction will further cause crack closure and permeability reduction.关键词
页岩气/水力压裂/裂缝网络/渗透率/有效应力/蠕变变形Key words
shale gas/hydraulic fracturing/fracture network/permeability/effective stress/creep deformation分类
能源科技引用本文复制引用
赵海军,马凤山,刘港,冯雪磊..致密储层压裂缝网渗透性变异的影响因素分析[J].桂林理工大学学报,2017,37(3):531-535,5.基金项目
国家自然科学基金项目(41372325 （）
41372323 （）
41402280) （）
中国科学院战略性先导科技专项(B类)(XDB10030602) （B类）
