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《Journal of Southwest Petroleum University(Science & Technology Edition)》 2010-02
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A TWO-POINT RAY-TRACING METHOD BASED ON GRID-DIVISION

MEI Sheng-quan,ZHONG Ben-shan(College of Information Engineering,Chengdu University of Technology,Chengdu Sichuan 610059,China)  
The two-point ray-tracing is an effective method to solve complex geological structure reflection wave ray-tracing.In this paper,a new two-point ray-tracing method is proposed,it is based on the first-break wave ray-tracing tomography algorithm,and grid division is used to discrete model,through the forward procession of two-step ray-tracing method,the grid cells minimum travel-time from source point and receive point is calculated respectively,and each cell sum of the twice travel-times is taken as the minimum travel-time,again along the layer interface,the nearest minimum travel-time cell is researched.Then the Particle Swarm Optimization (PSO) algorithm is used to search the minimum travel-time point in this cell,as the reflex point,through the backward procession,the ray path is traced from this point to source point and receive point respectively with the Linear Travel-time Interpolation (LTI) algorithm.Finally the two-point ray-tracing path is obtained.
【Fund】: 中国核工业地质局地质勘探资金项目(200661)
【CateGory Index】: TE132.1
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