Some aspects of wave propagation in porous media

The different models for wave propagation in porous media are reviewed briefly, and the concept of the pore pressure buildup coefficient is introduced, which allows to consider the effect of pressure in fluid substitution. This is followed by a brief discussion of the effect of different saturation profiles on elastic moduli. While these theories cover the kinematic aspects in an acceptable manner, the effects of attenuation (intrinsic as well as extrinsic) remain not very well explained, because different mechanisms are dominating at different frequency bands. The phase of the constant-Q-operator is derived.