复杂介质常梯度射线追踪方法研究
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摘要
射线追踪方法是研究地震波传播的重要手段。射线追踪有多种算法 ,相比而言 ,以 L angan等人的算法最好 ,它不仅适用于复杂介质模型 ,而且能够保证计算精度及效率。本文对 L angan(1985 )提出的基于程函方程的常梯度速度射线追踪方法进行了深入的研究 ,并对该射线追踪方法的实现以及在复杂介质的速度建模中的应用进行了有益的探索。算法中考虑了反射波、透射波和临界反射。理论试算进一步表明 ,该射线追踪方法对复杂介质具有较好的适应性。
Ray-tracing method is an important mean in study of seismic wave transportation. It has many algorithms,in comparison,the algorithm of Langan et al is the best,which is not only adaptable to the models in complex mediums but also can guarantee the computational precision and efficiency.The paper deeply studied the eiconal-function-based constant gradient velocity ray-tracing method presented by Langan (1985) and made useful probe into the realization of the ray-tracing method and the application of velocity model-building in complex medium.The reflection wave,transmission wave and critical reflection are considered in the algorithm.The theoretical tests showed that the ray-tracing method has good adaptation to complex medium.
Ray-tracing method is an important mean in study of seismic wave transportation. It has many algorithms,in comparison,the algorithm of Langan et al is the best,which is not only adaptable to the models in complex mediums but also can guarantee the computational precision and efficiency.The paper deeply studied the eiconal-function-based constant gradient velocity ray-tracing method presented by Langan (1985) and made useful probe into the realization of the ray-tracing method and the application of velocity model-building in complex medium.The reflection wave,transmission wave and critical reflection are considered in the algorithm.The theoretical tests showed that the ray-tracing method has good adaptation to complex medium.
引文
[1] 徐常练.地震波旅行时计算研究现状.SEG第68届年会论文概要.北京:石油工业出版社,1999
[2] 黄联捷,李幼铭,吴如山.用于图像重建的波前法射线追踪.地球物理学报,1992,35(2):223～233
[3] 刘洪,孟凡林,李幼铭.计算最小走时和射线路径的界面网全局方法.地球物理学报,1995,38(6):823～832
[4] 高尔根,徐果明等.二维复杂介质的块状建模及射线追踪.石油地球物理勘探,2001,36(2):213～219
[5] L anganR T,L ercheI andCutlerR T.Tracing of raysthrough heterogeneous media:an accurate and efficientprocedure.Geophysics,1985,50(9):1456～1465
[6] UmJ andThurberC H.A fast algorithm for two-point seismic ray tracing.BullSeisSocAm,1987,77(3):972～986
[7] FerraV.Ray tracing in com plex media.J ApplGeo-phys1993,30(1):55～73
[8] CoultripR L .High accuracy wavefront tracing travel-time calculation.Geophysics,1993,58(2):284～292
[9] SunY.Ray tracing in3-D m edia by param eterizedshooting.GeophysJ Int,1993,114(1):145～155
[2] 黄联捷,李幼铭,吴如山.用于图像重建的波前法射线追踪.地球物理学报,1992,35(2):223～233
[3] 刘洪,孟凡林,李幼铭.计算最小走时和射线路径的界面网全局方法.地球物理学报,1995,38(6):823～832
[4] 高尔根,徐果明等.二维复杂介质的块状建模及射线追踪.石油地球物理勘探,2001,36(2):213～219
[5] L anganR T,L ercheI andCutlerR T.Tracing of raysthrough heterogeneous media:an accurate and efficientprocedure.Geophysics,1985,50(9):1456～1465
[6] UmJ andThurberC H.A fast algorithm for two-point seismic ray tracing.BullSeisSocAm,1987,77(3):972～986
[7] FerraV.Ray tracing in com plex media.J ApplGeo-phys1993,30(1):55～73
[8] CoultripR L .High accuracy wavefront tracing travel-time calculation.Geophysics,1993,58(2):284～292
[9] SunY.Ray tracing in3-D m edia by param eterizedshooting.GeophysJ Int,1993,114(1):145～155
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