【摘要】 对裸眼井中由点状声源激发的弹性波传播问题做了数值研究,认为动力学模型所指出的首波(纵波)和次首波(横波)的传播路径与几何声学理论所指出的“滑行纵波”和“滑行横波”的传播路径是一致的,验证了首波和次首波分别是以地层中纵波速度和横波速度传播的这一理论的正确性。数值分析表明,次首波受首波后续波和伪瑞利波的影响较大;弹性波中只有斯通利波的幅度受声源发射主频的影响最小;而首波、次首波及多模式的伪瑞利波的幅度随声源发射主频的改变而改变,且具有各自的最佳传播频率;无流体直达波。更多还原

【Abstract】 In this paper, the numerical analysis of elastic waves propagatingalong a fluid-filled borehole excited by a point acoustic source is inves-tigated. It is shown that the propagating traces of compressional and shearwaves proposed in the dynamic model are in agreement with the onesobtained in the geometrical acoustic theory. It is also shown that theshear waves are affected by the compressional and Pseudo-Rayleigh waves.The amplitudes of Stoneley waves are not affected by the pincipal frequencyof transmission from the source. Compressional waves, shear waves andPseudo-Rayleigh waves of multiple modes are affected by the source principal frequency, and indicate that they have characteristic propagatingfrequencies. No direct fluid wave exists.更多还原