论文部分内容阅读
测量井剖面声波传播速度以判断岩性并估算贮集层孔隙率的方法已得到广泛的运用。 根据声波纵波传播速度估算岩层孔隙率的方法基于以下假设:当孔隙在岩层中是均匀分布的,孔隙率变化范围不大时,声速测井测得的岩层平均时差△t(即在单位厚度岩层中声波传播所需的时间)和岩石骨架声速V_ma(指纵波,以下同),孔隙中液体的声速V_t以及岩层孔隙率φ之间有以下近似关系:
The method of measuring sound velocity in the section of a well to determine the lithology and estimating the porosity of a reservoir has been widely used. The method of estimating the porosity of a rock formation based on the propagation velocity of the SSP is based on the assumption that when the porosity is uniformly distributed in the rock and the range of porosity does not change much, the mean time difference Δt (ie, In the acoustic propagation time) and the rock skeleton sound velocity V_ma (refers to the longitudinal wave, the same below), the sound velocity of the liquid V_t and rock formation porosity φ between the following approximate relationship: