Propagation and damping of compressional waves in porous rocks: Theory and experiments
- Delft Univ. of Technology (Netherlands)
This study investigates the frequency-dependent propagation and damping of compressional waves in a fluid-saturated porous rock. To this end, a one-dimensional numerical model is developed which is based on the linear Biot theory. Numerical results for reflected and transmitted plane waves (including multiples) in a fluid/rock/fluid configuration are compared with ultrasonic laboratory transmission experiments on a fluid-saturated porous slab. The slab consists of a skeleton of fused glass beads. For this 1-D case, i.e. all lateral velocities are neglected, the incident wave generates two transmitted compressional (P) waves in the porous rock, each with its own frequency-dependent wavespeed and damping. Results are computed using a dynamic permeability which describes the frequency-dependent interaction forces between the fluid and the solid constituents of the porous rock. It is shown, both numerically and experimentally, that the damping of the first compressional wave, which describes the in-phase behavior of the fluid and the solid, is much less than the damping of the second compressional wave, which describes the out-of-phase behavior. Furthermore, we notice that the higher frequencies are much more damped than the lower frequencies. which is in accordance with our dynamic interaction mechanism.
- OSTI ID:
- 542897
- Report Number(s):
- CONF-951013--
- Country of Publication:
- United States
- Language:
- English
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