页岩气藏吸附及解吸附特征对产量的间接影响  

Indirect Influence of Adsorption and Desorption Characteristics on Productivity of Shale Gas Reservoir

作　　者：刘骞 LIU Qian(Great Wall Drilling Company,CNPC,Panjin Liaoning 124010,China)

机构地区：[1]中国石油集团长城钻探工程有限公司,辽宁盘锦124010

出　　处：《重庆科技学院学报（自然科学版）》2020年第2期18-20,40,共4页Journal of Chongqing University of Science and Technology：Natural Sciences Edition

基　　金：国家科技重大专项“大型油气田及煤层气开发”子项目“四川盆地及周缘页岩气形成富集条件、选区评价技术与应用”(2017ZX05035004)。

摘　　要：通过页岩气数学模型模拟,研究吸附、解吸附过程中页岩气藏的物性变化规律。研究表明,页岩气藏物性受压力下降过程中的岩石膨胀作用和吸附气解吸附过程中的岩石收缩作用双重影响。压力的下降,引起岩石基质膨胀,导致基质孔隙度降低;吸附气的解吸附作用会使岩石基质产生一定程度的收缩效应,导致基质孔隙度增大。基质孔隙度在2种效应的耦合作用下逐渐变小;裂缝的渗透率在2种效应的耦合作用下会逐渐变大。裂缝孔隙度和基质渗透率的值很小,其变化可忽略。Through the mathematical model of shale gas,the effect of adsorption gas desorption on shale gas reservoir properties is studied. The results show that the reservoir properties are affected by the expansion of rock and the effect of adsorption gas desorption on the shrinkage of rock. With the decrease of pressure during shale gas production,the expansion of rock matrix will lead to the decrease of matrix porosity. On the other hand,the desorption of adsorbed gas will cause a certain degree of shrinkage effect of rock matrix,resulting in the increase of matrix porosity. The porosity of the matrix is gradually reduced by the coupling effect of the two effects,and the permeability of the fracture increases gradually through the coupling of two effects. The porosity and permeability of the fracture are negligible because of their small values.

关 键 词：页岩气 解吸附 渗流模型 基质孔隙 天然裂缝渗透率 

分 类 号：TE332[石油与天然气工程—油气田开发工程]