二维非均匀介质移动网格的射线追踪算法
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摘要
１９８５年Ｌａｎｇａｎ等人提出的方法是一个非均匀介质射线追踪的有效算法，它广泛用于地震层析成像的正演过程中。计算时它需要对非均匀介质进行网格划分，射线追踪时需要确定追踪的下一个网格的编号，这使程序复杂化且耗费机时。在Ｌａｎｇａｎ方法的基础上，本文提出了一种移动网格的射线追踪算法，这种方法实际上不需要对介质进行网格划分，理论和实算均表明，该方法程序简单，节约计算机内存，在保证计算精度的条件下，提高了计算效率。
The method proposed by Lungan etal. in 1985 is an effective procedure for tracing rays through hetero-geneous medin. It is broadly used in forward process of seismic tomographic in version techniques.We to break the medium does cells when using this methed and need to determine the next tracing cell number,which makes the program complicated and time consuming.Based on Lengan′ s methed,here we propose a moving-cell ray tracing algorithm,in which the medium is not necessary to be diviued into cells. It has been shown theoretlcally and practically that our procedure is simple for programming and it saves computer stor-ages and is more efficient under the same accuracy.
The method proposed by Lungan etal. in 1985 is an effective procedure for tracing rays through hetero-geneous medin. It is broadly used in forward process of seismic tomographic in version techniques.We to break the medium does cells when using this methed and need to determine the next tracing cell number,which makes the program complicated and time consuming.Based on Lengan′ s methed,here we propose a moving-cell ray tracing algorithm,in which the medium is not necessary to be diviued into cells. It has been shown theoretlcally and practically that our procedure is simple for programming and it saves computer stor-ages and is more efficient under the same accuracy.
引文
［1］Langan，R．T，Derche，I．andCutlet，R．I，Tracingoftaysthroughheterogeneousmedia，Anaccurateandefficientprocedure，Geophysics，1985，50（9）：1456～1465．［2］长春地质学院、成都地质帝院、武汉地质学院：1980，地震勘探——原理和方法，地质出版社，92－96．［3］周熙襄、钟本善、江玉乐、刘学才、唐宗黄、管叶君、里洪亮：1992，用旅行时反演确定层速度的横向变化，石油地球物理勘探，27（1）：59～72
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