二维复杂速度结构中的射线追踪

Ray Tracing in Two-Dimension Complex Velocity Structure

针对二维复杂速度结构中的射线追踪,给出模型参数和追踪方法。采用该方法,能够精确地描述复杂的二维地质形体及地质构造的分界面特征,并且能够适用于各种复杂地形的情形;对不同的地层或地质体,根据其速度分布特征,采用局部网格化对其进行描述,减小了复杂地质结构在描述速度时计算机所需要的内存量,进一步提高了计算速度。本射线追踪方法不仅可以对复杂模型的反射波及回折波进行追踪,而且可以利用"微折射"方法对目标界面的首波进行追踪。

For ray tracing in 2D complex media, the model parameterization system is proposed to describe the boundaries and the velocity distributions for complicated geological structure precisely. Based upon the charac- teristics of the velocity distribution within a layer or block, the system can save computational memory and speed up the calculation by local griding method. The ray tracing method not only can deal with the reflection and diving waves but also can calculate the head wave for concerned boundary by weak refraction.