井间层析成像混合最短射线追踪旅行时反演  

Travel Time Inversion by Hybrid Shortest Path Ray Tracing in Crosshole Tomography

作　　者：段心标[1] 金维浚[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029

出　　处：《工程地球物理学报》2007年第3期201-206,共6页Chinese Journal of Engineering Geophysics

基　　金：中国科学院工程地质力学重点实验室课题资助;中国科学院知识创新工程重点方向项目(编号:KZCX2-YW-109-1)资助

摘　　要：传统的曲射线追踪方法存在一定的缺陷,弯曲法得到的旅行时可能收敛到局部最小而不是全局最小。为了使其得到较好的射线路径,本文介绍一种方法对弯曲法进行修改。其起始猜测路径采用由SPR得到的曲折射线,这样既可以获得全局最小走时,又避免了SPR方法的射线路径不够光滑,相当于对SPR所得射线路径做平滑处理。射线追踪路径实例和井间地震层析成像模型反演表明,这种混合方法效果很好。The travel time by the bending method may be restricted to the local minimum instead.of the whole minimum because there are certain drawbacks with the traditional ray tracing method. In order to get a better ray path. The paper introduces a method that can modify the bending method. The initial guess path will use the refraction ray from the shortest path ray（SPR）method, which not only can obtain the overall minimum travel time,but also can prevent the not enough smooth ray path by SPR method, because the method has smoothened the ray path from the SPR method. The hybrid method has a good effect on the ray tracing cases and the crosshole seismic tomography.

关 键 词：射线追踪 弯曲法 最短路径法 

分 类 号：P631[天文地球—地质矿产勘探]