多孔介质声波传播

基于二维有限差分给出了Ｂｉｏｔ声波方程的一种数值解方法，模拟了声波在多孔介质中的传播。研究发现，骨架和粘滞性孔隙流体中，同时存在两种纵波，即快纵波和慢纵波，两种纵波骨架振动势函数与流体相对骨架振动势函数相不同，幅度也不同；但具有相同的传播速度，粘滞性和渗透率主要影响能量传播；孔隙度和骨架弹性参数主要影响波速；慢纵波和界面波的存在是地震波能量损失的重要原因。

ACOUSTIC WAVE PROPAGATION IN POROUS MEDIA

Based on 2-D finite-differences,this paper presents a method of numericalsolution of Biot's acoustic equation. The acoustic wave propagation in porous mediav wassimulated. The study shows that there exist two compressional waves named as the fast waveand the slow wave 60th in the solid matrix and in the viscous pore fluid.Potentials of solidand relative fluid displacement for the two waves are out of phase and have differentamplitude,but move at the same velocity correspondently.The viscosity and permeabilitymainly inflence the energy propagation porosity and elastic parameters of matri x primarilyinflence wave velocities.The existence of slow wave and surface waves is the importantreason of energy lost of seismic wave.