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Porosity ($\phi$) and grain density ($\rho_s$) of the samples are determined by means of Hg porosimetry.\\  The P- and S- wave velocity are then calculated using:  \begin{equation}   V_p = sqrt\bigg(\frac{K_{sat}+\frac{4}{3}G_{sat}}{\phi}\bigg) \sqrt\bigg(\frac{K_{sat}+\frac{4}{3}G_{sat}}{\phi}\bigg)  \end{equation}  Since shear modulus of the saturated rock ($G_{sat}$) is also the shear modulus of the frame ($G_{dry}$), the saturated bulk modulus obtained with equation \ref{eq:Kdry} and the shear