页岩储层裂缝渗透率动态变化研究  

A Dynamic Model of Shale Fracture Permeability

作　　者：孙同英[1,2] 陈永昌 厉亚明 刘运霞 刘银山 

机构地区：[1]中原油田采油二厂,河南濮阳457006 [2]中国地质大学(北京)能源学院,北京100083 [3]陕西延长石油集团研究院,西安710075

出　　处：《重庆科技学院学报（自然科学版）》2016年第6期5-8,16,共5页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：国家科技重大专项"泥岩内油气储集状态及渗流机理研究"(2011ZX05009-006);中央高校基本科研业务基金项目"非常规油气储层特征及开采机理研究"(35832015034)

摘　　要：在页岩气藏开采过程中,页岩储层的渗透性随孔隙压力的降低而发生变化。分析有效应力效应、基质收缩效应和克林肯伯格效应对页岩渗透率的影响,在此基础上建立页岩裂缝渗透率动态变化模型,综合研究页岩储层裂缝渗透率的动态变化规律。研究结果表明:开采初期,页岩储层压力降低,有效应力的影响显著;开采中期,当页岩储层压力降低到气体临界解吸压力后,页岩吸附气不断解吸,基质收缩效应开始影响裂缝的渗透性;开采后期,在低压环境下克林肯伯格效应成为主导影响因素。In the process of exploiting shale gas reservoirs, the permeability of shale decreases with the decrease of pore pressure. On the basis of considering the effects of effective stress, matrix shrinkage and klinkenberg effect, we propose a new dynamic change model of fracture permeability to comprehensively study the dynamic variation law of fracture permeability of shale reservoir. The results suggest that the impact of effective stress is obvious at the early time, when the pressure reduces to the critical desorption pressure; with the desorption of adsorbed gas, the matrix shrinkage effect affects the permeability; and at the late stage, the klinkenberg effect becomes the dominant factor.

关 键 词：页岩 裂缝渗透率 有效应力 基质收缩效应 克林肯伯格效应 

分 类 号：TE311[石油与天然气工程—油气田开发工程]