山地地震资料叠前时间偏移方法及其GPU实现  

Method of prestack time migration of seismic data of mountainous regions and its GPU implementation

作　　者：刘国峰[1] 刘洪[1] 李博[1] 刘钦[2] 佟小龙[2] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]北京吉星吉达科技有限公司,北京100029

出　　处：《地球物理学报》2009年第12期3101-3108,共8页Chinese Journal of Geophysics

基　　金：国家重点基础研究发展计划(973计划)(2007CB209603);国家自然科学基金重点项目(40830424)资助.

摘　　要：山地地区地下地质结构复杂,地表高差大,变化剧烈.目前该类地区地震勘探中主要的成像手段依然是Kirchhoff叠前时间偏移.但地表高程的剧烈变化使叠前时间偏移的基准面很难选择.本文在传统方法的基础上,提出了一种在浮动基准面上修正常规叠前时间偏移走时计算的叠前时间偏移方法,该方法能够很大程度上提高山地地区、特别是地表高差变化大地区的成像效果.本文还介绍了GPU在叠前时间偏移上的应用,通过GPU对叠前时间偏移的优化和实现,得出如下结论:应用单颗NVIDIA Tesla C1060 GPU进行叠前时间偏移,相比应用主频2.5 GHz的单核CPU计算效率可提高70倍以上.The geological structure in the mountainous regions is quite complicated, and the elevation varies violently. At present, the main approach for seismic data imaging is the prestack Kirchhoff time migration, however, violent variation of surface elevation makes the datum plane selection of prestack time migration very difficult. This article proposed a new prestack time migration method through modifying the routine travel time computation, this method can greatly raise the imaging effect in mountainous region with obvious variation of surface elevation. In addition, this paper also introduced application of GPU in prestack time migration, by which the prestack time migration has been optimized and implemented, and the computation efficiency of single NVIDIA Tesla C1060 GPU can be more than 70 times faster than single core CPU with main frequency of 2.5 GHz when without the I/O problem.

关 键 词：山地地震资料 叠前时间偏移 GPU 

分 类 号：P631[天文地球—地质矿产勘探]