Comments on: “Numerical validation of Gassmann’s equations” (Yury Alkhimenkov, 2023, Geophysics, 88, no. 4, A25–A29)

Abstract

The well-known “Biot-Gassmann” equation for the fluid dependence of incompressibility of a porous rock is in error. However, a recent numerical calculation on a simple rock model verifies that equation. The calculation appears to be correct but constitutes a special case not representative of real rock. Physical experimentation on actual rocks is required to verify the corrected theory.