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.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2010年第2期299-301,共3页
Journal of Oil and Gas Technology
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
formation conditions
rock compressibility
effective pore
compression coefficient
porosity
stress-sensitive
