And then, underground coal porositycalculation method and variational characteristic of coal effective pore volume compressibility are discussed. 进而探讨了煤岩地下孔隙度的计算方法和煤岩有效孔隙体积压缩系数的变化特征。
From the reservoir-engineering standpoint, effective porosity is the quantitative value desired, as this represents the space that is occupied by mobile fluids. 由于有效孔隙度表示了可流动流体所占有的空间，因此从油藏工程的观点来看，有效孔隙度是所需要的定量值。
