Figure 5.

Comparison of non dimensional fast and slow wave velocities versus non dimensional acoustic modulus associated to the Biot elasticity tensor $R_o^Q$, to the drained elastic constants $R_o^{Cd}$ and to the fluid constituent $R_o^{\mathit{MAA}}$. It can be observed how the Biot elasticity tensor follows a trend similar to the drained elastic constants, and changes in behavior around 70% porosity to become similar to the fluid modulus $R_o^{\mathit{MAA}}$. The Biot elasticity tensor has a very similar behavior to the fast wave over the whole range of porosity.