Scholte Wave Field and Dispersion Curve in Porous Multi-layered Media Filled with Fluid

Abstract

The Scholte wave is a kind of solid surface wave that propagates on the seabed. To study the influences of pore-fluid parameters on the propagation characteristics of Scholte waves, the recursive solution and dispersion equation of Scholte wave is derived for porous multi-layered media filled with fluid based on Biot-Gassmann equation. A direct relationship equation between pore-fluid parameters, Scholte wave velocities and densities of pore fluid media is established. The recursive solution of Scholte wave propagating along the interface of porous multi-layered media filled with fluid is derived by using the boundary conditions of seismic wave field. The influences of pore fluid parameters on Scholte wave field and its dispersion characteristics are studied through numerical analysis. The numerical results show that the oil and gas-bearing pores could affect the dispersion characteristics and displacement stress of Scholte wave. Therefore, the effect of pore fluid should be fully considered for the further seabed Scholte wave rich in porous multi-layered media filled with fluid. In this paper, it provides a theoretical method for solving dispersion equations of Scholte wave propagating in coastal porous multi-layered media filled with fluid.