低渗透气藏应力敏感性实验研究  

Lab research on stress sensitivity of low permeability gas reservoirs

作　　者：李孟涛[1] 姚尚林[2] 单文文[2] 

机构地区：[1]中国石化勘探开发研究院,北京100083 [2]中国科学院渗流流体力学研究所,河北廊坊065007

出　　处：《大庆石油地质与开发》2006年第6期69-72,共4页Petroleum Geology & Oilfield Development in Daqing

摘　　要：地应力是影响储层物性参数的重要因素,特别是对地应力敏感的储层。实验研究表明,不管是干燥岩石还是含束缚水岩石,低渗透砂岩气藏储层的应力敏感性是客观存在的,而且这种应力敏感性对储层渗透率造成的伤害不可忽视。随着有效压力的升高,渗透率是逐渐降低的。低渗透气藏岩心的孔隙度随有效压力的增大呈指数关系递减。低渗透气藏应力敏感性与储层含水饱和度有关,束缚水饱和度越高,应力敏感性越强。低渗透气藏孔隙变形具有弹塑性变形的特征。Crustal stress is an important element which affects reservoir parameters of property,especially for reservoirs more sensitive for crustal stress.Test study indicates that,stress sensitivity of low permeability gas reservoirs exists objectively not only for dry rocks,but also rocks with irreducible water,and harm of stress sensitivity to permeability cannot be ignored.With increasing of effective pressure,permeability declines gradually,and porosity decreases according to the exponentail relations.Stress sensitivity has relationship with water saturation of reservoirs.The higher irreducible water saturation is,the more stress sensitivity is.Pore deformation of low-permeability gas reservoirs is characteristic of elastic plastic deformation.

关 键 词：应力敏感性 渗透率 孔隙度 低渗透气藏 束缚水 

分 类 号：TE311[石油与天然气工程—油气田开发工程]