Poroelastic velocity and attenuation in media with anisotropic permeability
- Univ. of Karlsruhe (Germany)
In porous reservoir rocks permeability may show strong anisotropy due to fractures of thin layering. The authors discuss the influence of anisotropic permeability on seismic velocities and attenuation. To model the wave propagation in the reservoir they use Biot-theory (1956, 1962) for homogeneous media. The complex reservoir therefore appears as an effective medium. The effects of fractures or layers are thus assumed to be only anisotropy of the poroelastic frame and of the permeability. Choosing Biot-theory as basis means that they consider only effects of global fluid flow. For the seismic frequency range up to {approx} 100 Hz they discuss all velocity and attenuation effects analytically, for frequencies up to 10 kHz they show numerical results. They find that for seismic frequencies the velocity anisotropy is dominated by poroelastic static anisotropy, whereas attenuation is strongly influenced by anisotropic permeability, leading to directional attenuation. For frequencies of more than {approx} 1 kHz, permeability anisotropy of one order of magnitude affects the velocities significantly, whereas attenuation anisotropy becomes remarkably smaller than in the seismic frequency range.
- OSTI ID:
- 80298
- Report Number(s):
- CONF-941015--
- Country of Publication:
- United States
- Language:
- English
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