Biot's slow wave in Massillon and Berea sandstones
- Lawrence Livermore National Lab., CA (USA)
- Ohio State Univ., Columbus, OH (USA)
Biot,s proposed a comprehensive theory that has explained many of the important features of wave propagation in fluid-saturated porous media. One striking feature of the theory is the prediction of a slow compressional wave with a speed lower than that of either component. Since the slow mode involves a coupled motion of fluid and solid, it's speed and attenuation depend on the morphology of the pore space, which also determines fluid transport properties such as formation permeability. Mode conversion from fast to slow waves at interfaces should contribute a source of strong wave attenuation as the slow wave propagates. In site of the revival of interest in the predicted mode, no unambiguous examples of slow wave propagation in natural rocks for viscous fluids have been reported because of strong attenuation and interference from the ordinary fast compressional and shear waves. We describe here a new experimental technique using air coupled ultrasonic waves and air saturation that allows unambiguous observations of slow waves in both synthetic and natural porous materials. This method provides a direct link between fluid transport and wave propagation properties for porous rocks. 5 refs., 2 figs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- W-7405-ENG-48; FG02-87ER13749
- OSTI ID:
- 6720358
- Report Number(s):
- UCRL-JC-103661; CONF-900907--1; ON: DE90011229
- Country of Publication:
- United States
- Language:
- English
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