摘要
首先简述了2-D横向各向同性介质中的波慢度面方程及其似P波、似SV波与似SH波速度关系式;接着推导了3-D横向各向同性介质中波慢度面方程,导出了3-D条件下地震波速度随波动传播方向变化的关系式;计算并讨论了2-D与3-D横向各向同性介质中地震波波慢度面及地震波波速,并发现,似P波、似SV波及似SH波波慢度面一般为不规则椭圆或椭球;似P波、似SV波与似SH波速度不仅与θ、(?)有关,而且,似SV波与似SH波的传播速度不同。
In this paper, we discusses seismic slowness surfaces'equations and velocities of qP qSV and qSH waves in 2-D TIM. Then we derived seismic slowness surfaces'equations in 3-D TIM, and obtained formula of seismic velocities with parameters θ and ψ. Authors calculated and discussed the results and found that the seismic slowness surfaces of qP, qSV and qSH waves are very complicated and irregular. They appear to be ellipses or ellipsords in 2-D or 3-D TIM.Not only velocities of qP qSV and qSH waves depend on θ and ψ,but the vSH and vSV are also different.
关键词
地震勘探
波慢度面
同性介质
二维
2-Domain, 3-Domain, transversely isotropic medium (TIM), seismic slowness surface, seismic prospecting
