White's model for wave propagation in partially saturated rocks: Comparison with poroelastic numerical experiments

摘要: We use a poroelastic modeling algorithm to compute numerical experiments of wave propagation in White’s partial saturation model. The results are then compared the theoretical predictions. model consists homogeneous sandstone saturated with brine and spherical gas pockets. theory predicts relaxation mechanism, due pressure equilibration, causing attenuation velocity dispersion wavefield. vary either by increasing radius pocket or density bubbles. Despite that is two dimensional interaction between pockets neglected model, show trends predicted theory. In particular, we observe similar increase at high frequencies (and low permeabilities). Furthermore, behavior peaks versus water frequency more dissipation higher velocities than multiple scattering local fluid-flow effects. conversion fast P-wave energy into dissipating slow waves patches main mechanism attenuation. Differential motion rock skeleton fluids highly enhanced presence fluid/fluid interfaces gradients generated through them.