PROPAGATION OF ACOUSTIC WAVES IN A WATER-SATURATED POROUS MEDIUM FORMED BY A GAS HYDRATE

The propagation of acoustic waves in a porous medium whose skeleton consists of a gas hydrate with pores fi lled with water has been studied. A system of equations is written that describes the propagation of acoustic waves in such a porous medium. A dispersion equation is obtained, on the basis of which the phase velocity of sound and the decrement of attenuation of acoustic waves are analyzed. The coeffi cients of refl ection and passage at the "liquid–porous medium" and "porous medium–liquid" interfaces have been derived and investigated. Based on the dispersion equation and corresponding refl ection and passage coeffi cients, the propagation of the fi nite-duration pulses in the porous medium is investigated. The possibility of estimating the thickness of the gas hydrate bed with the aid of acoustic waves is shown.
   
Author:  V. L. Dmitriev, I. G. Khusainov, and I. K. Gimaltdinov
Keywords:  acoustic waves, porous medium, gas hydrate, dispersion relation, refl ection and passage coeffi cients, fast Fourier transform
Page:  1563