复杂地质模型转换波快速射线追踪方法

Fast Ray Tracing Method for Converted Waves in Complex Media

最小旅行时树法是目前主要射线追踪方法之一,该方法以惠更斯原理和费马原理为基础,具有适应复杂地质模型的优点,缺点是速度较慢.针对这一问题,对其初至波基本算法进行了改进,在保证精度的条件下,改进算法的计算速度显著提高,达到实用要求.然后,以P—SV波为例,给出了转换波快速射线追踪方法,模型计算结果表明,本文所提出的转换波快速射线追踪方法对复杂地质模型是切实可行的.

The minimum travel-time tree algorithm is one of the main methods to trace rays, which is based on Huygens' and Fermat's principles and can be applied to complex geological model. In order to eliminate its disadvantage of slowness, the basic algorithm for first-break waves was improved to speed its calculation without decreasing its accuracy so that it can be put into practical use. And the scheme for P-SV waves was put forward as an example of converted waves. The numerical example has proven that the scheme for converted waves is effective.