Under the framework of Biot’s poroelasticity, we have theoretically investigated the influences of boundary conditions on the seismic wave dispersion and attenuation in partially saturated rocks. A scaling factor is proposed to characterize the influences of boundary opening degree on the coupled fluid pressure diffusion processes of mesoscopic flow between gas and brine and fluid flow between brine and outer boundary. We have demonstrated that the boundary conditions significantly control the seismic wave dispersion and attenuation characteristics in partially saturated rocks. The drained and partially drained conditions tend to move the peak frequency into higher frequency domain, and broaden the attenuation spectrum. The sensitivity of velocity to gas saturation tend to be decreased under the drained and partially drained condition.
Presentation Date: Wednesday, October 14, 2020
Session Start Time: 1:50 PM
Presentation Time: 2:40 PM
Location: Poster Station 12
Presentation Type: Poster