论文部分内容阅读
尽管射线理论是基于波动方程高频假设下的一种近似理论,两者本应相互佐证共同发展完善,然而实际上确是平行独立的.鉴于此,本文提出了一种可以相互验证波场数值模拟或射线追踪数值模拟方法正确性和有效性的佐证方法.为了实现上述目的,我们首先将用于各向同性介质中多次波预测的分区多步不规则最短路径算法推广至各向异性TTI介质中,使其具备追踪各向异性TTI介质中多次波的能力.然后,通过伪谱法波场数值模拟和分区多步不规则最短路径算法预测得到的波场快照图、单炮地震记录剖面、以及合成理论地震图的分析对比,不但可以相互验证两种算法的正确性和有效性,同时对地震波在各向异性TTI介质中的传播规律和特点有了深刻的理解和认识.结果表明:本文提出的各向异性介质中多次波射线追踪算法是正确有效的.
Although ray theory is an approximation based on the high-frequency assumption of the wave equation, the two theories should be mutually supportive and developed together, but in fact they are indeed parallel and independent. In view of this, a new method that can verify the wave field values Simulation or ray tracing method to simulate the correctness and validity of the method.In order to achieve the above purpose, we first generalize the partitioned multi-step irregular shortest path algorithm for multiple prediction in isotropic media to anisotropic TTI Medium to make it possesses the capability of tracking multiple waves in anisotropic TTI media.Furthermore, by using the pseudo-spectral wavefield numerical simulation and the partitioned multi-step irregular shortest path algorithm to predict the wave field snapshots, Section and synthetic seismogram can not only validate the correctness and validity of the two algorithms, but also have a profound understanding and understanding of the laws and characteristics of seismic wave propagation in anisotropic TTI media. The multipath ray tracing algorithm proposed in this paper is correct and effective in anisotropic media.