二维层状VTI介质试射射线追踪方法

摘要

地震波场正演模拟是研究地震波传播规律的有效手段，为地震勘探提供基本的理论依据。为提高地震勘探的精度及勘探能力，研究复杂介质中地震波传播问题显得尤为重要。针对各向异性介质中的地震波场正演问题，基于各向异性介质和试射射线追踪方法的基本理论，分析了横向各向同性(VTI)介质中存在的群相关系，研究了 VTI 介质中的 Snell 定律及角度转换关系，并引入了透射系数和反射系数，具体讨论了试射射线追踪算法，通过数值模拟实现了地震波场正演，客观合理地模拟了地震波在VTI介质中的传播。%Seismic wave numerical simulation is an effective measure to study seismic wave propagation,and it provides theoretical basis for seismic exploration.In order to improve the precision and ability of seismic exploration,it is particularly important to research seismic wave propagation in complex media.According to the seismic forward modeling in anisotropic media,from the theories of anisotropic media and shooting ray-tracing method,and on the basis of existing studies,the group-phase relations of velocity and angle are analyzed respectively in vertical transversely isotropic (VTI)media.Then the Snell theorem and the angular relation are studied in VTI media,and both the reflection coefficient and the transmission coefficient are brought in.The shooting ray-tracing algorithm is discussed specifically,and the seismic forward modeling is achieved by numerical simulation,which can simulate the seismic wave propagation more obj ectively and reasonably in anisotropic media.