CAJ | 학술논문

两点射线追踪是解决复杂地质结构下反射波射线正演的有效方法.在初至波层析射线追踪算法基础上,提出了一种两点射线追踪方法,利用层析网格对模型进行离散化,通过两阶段法射线追踪,分别对激发点和接收点按向前处理过程计算模型单元及节点的旅行时,两次时间相加作为最小旅行时,再在目的层界面邻域扫描最小旅行时子震源网格单元,用粒子群算法在该单元内扫描全局最小旅行时点,得到反射点位置与反射夹角,再利用向后处理过程运用旅行时线性插值算法,从反射点分别到激发点、接收点反向追踪射线路径,最后得到反射波两点射线路径.
량점사선추종시해결복잡지질결구하반사파사선정연적유효방법.재초지파층석사선추종산법기출상,제출료일충량점사선추종방법,이용층석망격대모형진행리산화,통과량계단법사선추종,분별대격발점화접수점안향전처리과정계산모형단원급절점적여행시,량차시간상가작위최소여행시,재재목적층계면린역소묘최소여행시자진원망격단원,용입자군산법재해단원내소묘전국최소여행시점,득도반사점위치여반사협각,재이용향후처리과정운용여행시선성삽치산법,종반사점분별도격발점、접수점반향추종사선로경,최후득도반사파량점사선로경.
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.