岩石的压缩系数问题——再与王厉强博士商榷

岩石的应力关系方程是，外应力为骨架应力和流体压力的孔隙度加权平均值。应力关系方程适合于油藏的任何状态，而不是只适合于原始状态。由于岩石的骨架应力不好测量，因此，人们通常并不使用岩石的应力关系方程，而是直接使用有效应力形式的关系方程。常用的有效应力方程为Terzaghi方程和Biot方程。由岩石的应力关系方程导出的岩石压缩系数理论计算公式，呈现出了正确的逻辑关系，即孔隙度越大，压缩系数就越高；而且，当孔隙度为0时，岩石孔隙压缩系数的数值亦为0

Compressibility of Reservoir RocksReDiscussion with Dr Wang Liqiang

The stress relationship equation of reservoir rocks is that the total stress of reservoir rocks is a porosity?weighted average of skeleton stress and pore pressure. The stress relationship equation of reservoir rocks can be used in any state of reservoirs, not only in primary state. But such an equation is not directly used by researchers, while the effective stress equations are commonly used due to impossible measurement of skeleton stress of rocks. The well known effective stress equations are Terzaghi equation and Biot equation. The theoretical equation of rock compressibility derived by the stress relationship equation of reservoir rocks shows the correct logic relationship, namely, the higher the rock porosity, the larger the compressibility. Moreover, when rock porosity is zero, its compressibility is zero, too