CAJ | 학술논문

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 GH_z的单核CPU计算效率可提高70倍以上.
산지지구지하지질결구복잡,지표고차대,변화극렬.목전해류지구지진감탐중주요적성상수단의연시Kirchhoff첩전시간편이.단지표고정적극렬변화사첩전시간편이적기준면흔난선택.본문재전통방법적기출상,제출료일충재부동기준면상수정상규첩전시간편이주시계산적첩전시간편이방법,해방법능구흔대정도상제고산지지구、특별시지표고차변화대지구적성상효과.본문환개소료GPU재첩전시간편이상적응용,통과GPU대첩전시간편이적우화화실현,득출여하결론:응용단과NVIDIA Tesla C1060 GPU진행첩전시간편이,상비응용주빈2.5 GH_z적단핵CPU계산효솔가제고70배이상.
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 GH_z when without the I/O problem.