Rayleigh wave propagation along a traction-free surface within partially fluid-saturated porous media
Based on the existing three-phase poroelastic theory, an analytical solution for Rayleigh wave propagation along a traction free, permeable surface of an elastic porous medium, saturated by two immiscible, viscous, compressible fluids, is derived. The analytical expression of the dispersion equation of the Rayleigh wave is found to be a cubic polynomial. Through solving the dispersion equation, it is concluded that three different modes of the Rayleigh wave exist in such medium to be denoted as R1, R2, and R3, respectively. The influences of water saturation on these Rayleigh waves are numerically studied with varying frequencies from 1Hz to 1MHz. The results show that a significance dependence of the velocities and attenuation of the three waves on the water saturation. The amplitudes of the three waves decay in both x-and z-directions, which are parallel to and perpendicular to the propagation direction of the waves, respectively. The R1 wave travels fastest, and the R3 and R2 waves have the second greatest and smallest phase velocities, respectively. The R1 wave is least attenuated, followed by the R2 and R3 waves. The attenuation coefficients of the R2 and R3 waves versus water saturation and frequency bear the similar variation trend.
Haibo Zhao Jing Bian Xiuming Wang Lailin Li
E&D Research Institute,Daqing Oilfield Co.Ltd.,Daqing 163712,P.R.China NO.6 Oil Production Company,Daqing Oilfield Co.Ltd.,Daqing 163712,P.R.China Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,P.R.China
国际会议
The 10th Western Pacific Acoustics Conference(第十届西太平洋声学会议WESPAC X)
北京
英文
1-8
2009-09-21（万方平台首次上网日期，不代表论文的发表时间）