地层条件下岩石孔隙度变化研究  

Study of Rock Porosity Changes under the Formation Conditions

作　　者：刘铁成[1] 唐海[1] 吕栋梁[1] 刘鹏超[1] 赵永杰 

机构地区：[1]西南石油大学石油工程学院,四川成都610500 [2]中国石油集团海洋工程有限公司,天津300451

出　　处：《石油天然气学报》2010年第2期299-301,共3页Journal of Oil and Gas Technology

摘　　要：根据岩石孔隙度定义,借助于岩石的压缩系数及其相关关系,导出了地层中假定上覆压力不变条件下孔隙度随地层压力变化的计算表达式。从理论上证明了岩石在弹性形变过程中,孔隙度是变化的。低孔岩石具有较高孔岩石更强的应力敏感性。随地层压力的下降,岩石孔隙度绝对变化量不大。According to the definition of rock porosity,by means of rock compressibility and its correlations,the formula for calculating the porosity changes under the formation conditions was derived on the condition of assumption that the overlying pressure remained constant. It is theoretically proved that the porosity is changed with the elastic deformation. Compared with the rocks with high porosity,rocks with low porosity have higher stress sensitivity. The absolute changes of the rock porosity is not large with the formation pressure decline.

关 键 词：岩石压缩系数 岩石有效孔隙压缩系数 孔隙度 应力敏感 

分 类 号：P618.13[天文地球—矿床学]