Guided seismic waves in layered poroviscoelastic media for continuity logging applications: Model studies
- Southwest Research Inst., San Antonio, TX (United States). Dept. of Electronic Systems
The solution of a coupled system of differential equations based on Biot and homogenization theories is adapted to calculate guided seismic waves trapped in low-velocity layers. The general solution is for a 3D source in a horizontally layered poroviscoelastic medium having isotropic and laterally homogeneous material properties. A unified representation of the medium that includes fluid-solid interactions and viscoelastic losses is incorporated into the solution. The guided-wave part of the vector wave field and fluid-pressure of the complete wave motion in layered dissipative media is verified and used to simulate dispersion and attenuation of guided seismic waves for continuity logging applications. The results of this work suggest that the multimode wave solution is appropriate to simulate guided seismic wave signatures to indicate continuity of layered earth structures in poroviscoelastic reservoirs. In particular, the normal mode information can be used for planning continuity logging surveys and for interpreting the corresponding seismic data. Further, fluid-pressure waveforms show that maximum amplitude normal modes can be detected at layer interfaces in fluid-filled porous media, and the corresponding Airy phase wave groups may carry information on the formation permeability.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 277557
- Journal Information:
- Geophysical Prospecting, Vol. 44, Issue 3; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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