叠前深度偏移中的旅行时并行计算技术
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摘要
旅行时计算技术是基于波动方程叠前深度偏移方法的核心内容 ,射线跟踪的数值计算精度和效率直接影响着介质成像质量和实用化。基于三维射线跟踪的微变网络方法和波前重建思路 ,提出一种适用于三维复杂介质地震波走时的快速算法。但它所需计算量巨大。采用并行计算技术 ,设计出基于“任务缓冲池”的动态负载平衡策略 ,在现有的分布式计算机上 ,实现了三维射线追踪和叠前深度偏移的并行计算
The traveling time calculating technology is the core of the wave equation pre stack depth migration.The calculating precision and efficiency of the ray tracing have great effect on the quality and practicality of the medium imaging.According to the micro changing and wave front rebuilding of 3D ray tracing,we proposed a quick arithmetic applying to 3D complex medium seismic wave traveling time.But it needs great amount of calculation.We put up parallel calculating technology and design a dynamic loading balance policy.So we can realize the parallel calculation of 3D ray tracing and pre stack depth migration on distributed parallel computers.
The traveling time calculating technology is the core of the wave equation pre stack depth migration.The calculating precision and efficiency of the ray tracing have great effect on the quality and practicality of the medium imaging.According to the micro changing and wave front rebuilding of 3D ray tracing,we proposed a quick arithmetic applying to 3D complex medium seismic wave traveling time.But it needs great amount of calculation.We put up parallel calculating technology and design a dynamic loading balance policy.So we can realize the parallel calculation of 3D ray tracing and pre stack depth migration on distributed parallel computers.
引文
1 马在田,曹景忠,王华忠等计算地球物理学概论上海:同济大学出版社,1997213～244
2 匡斌,李心友,王华忠三维有限差分深度偏移并行算法的设计和实现同济大学学报,2000,28(2):183～188
3 徐升,杨长春,刘洪等射线追踪的微变网格方法地球物理学报,1996,39(1):98～100
4 孙家昶网络并行计算与分布式编程环境北京:科学出版社,1995153～243
2 匡斌,李心友,王华忠三维有限差分深度偏移并行算法的设计和实现同济大学学报,2000,28(2):183～188
3 徐升,杨长春,刘洪等射线追踪的微变网格方法地球物理学报,1996,39(1):98～100
4 孙家昶网络并行计算与分布式编程环境北京:科学出版社,1995153～243
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