山地地震资料叠前时间偏移方法及其GPU实现
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
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.
引文
[1] Bevc D.Imaging complex structures with semirecursive Kirchhoff migration.Geophysics,1997,62:577-588
    [2] Gray S,Etgen J,Dellinger J,Whitmore D.Seismic migration problems and solutions.Geophysics,2001,66:1622-1640
    [3] Dai H,Li X Y.The effects of migration velocity errors on traveltime accuracy in prestack Kirchhoff time migration and the image of PS converted waves.Geophysics,2006,71(2) : S73-S83
    [4] Dai H,Li X Y.Velocity model updating in prestack Kirchhoff time migration for PS converted waves:Part Ⅰ-Theory. Geophysical Prospecting,2007,55:525-547
    [5] Ma Y H,Wang S X,Sun C W.High resolution migration from topography:Experience with a mountainous area in China.76~(th) Annual International Meeting,SEG,Expand Abstacts,2006. 645-649
    [6] Gabriel Perez,Kurt J Marfurt.Improving lateral and vertical resolution of seismic images by correcting for wavelet stretch in common-angle migration.Geophysic,2007,72:C95-C104
    [7] Gray S,Marfurt K.Migration from topography:improving the near-surface image.Can.J.Expl.Geophys.,1995,31:18-24
    [8] Berryhill J R.Wave-equation datumimg before stack. Geophysics,198i,49:1064-2066
    [9] Berryhill J R.Wave-equatioin datuming.Geophysics,1984,44:1329-1343
    [10] Jager C,Hertweck T,Spinner M.True-amplitude Kirchhoff migration from topography.2002 72~(nd) Annual International Meeting,SEG,Expand Abstacts
    [11] Li J C,Priam.Land data migration from rugged topography. 2002 72~(nd) Annual International Meeting,SEG,Expand Abstacts
    [12] 谢飞,常旭,刘伊克.火山岩地震屏蔽层的转换波叠前时间偏移成像.地球物理学报,2008,51(6) :1899-1908 Xie F,Chang X,Liu Y K.Converted-wave pre-stack time migration in volcanic area.Chinese J.Geophys.(in Chinese),2008,51(6) :1899-1908
    [13] 董春晖,张剑锋.起伏地表下的直接叠前时间偏移.地球物理学报,2009,52(1) :239-244 Dong C H,Zhang J F.Prestack time migration including surface topography.Chinese J.Geophys.(in Chinese),2009, 52(1) :239-244
    [14] 方伍宝,朱海波,王汝珍.基于起伏地表模型的偏移方法比较.勘探地球物理进展,2007,30(5) :382-387 Fang W B,Zhu H B,Wang R Z.Comparison of different migration methods based on SEG irregular topography model data.PEG (in Chinese),2007,30(5) :382-387
    [15] 王华忠,李伟波,张元巧.起伏地表条件下偏移到多偏移距叠前时间偏移.勘探地球物理进展,2007,30(5) :362-367 Wang H Z,Li W B,Zhang Y Q.Migrating-to-multiple-offset prestack time migration for irregular topography.PEG (in Chinese),2007,2007,30(5) :362-367
    [16] Wiggins W.Kirchhoff integral extrapolation and migration of nonplanar data.Geophysics,1984,49:1239-1248
    [17] Reshef M.Depth migration from irregular surfaces with depth extrapolation methods.Geophysics,1991,56:119-122
    [18] Mark N,Divestco I.A fast and accurate migration from topography via coarse step downward wavefield.78~(th) Annual International Meeting,SEG,Expand Abstacts,2008. 2397-2400
    [19] NVIDIA.(2007) .CUDA Documentation.[Online].Available:http://www.developer,nvidia.com/cuda/[2007-5-4]
    [20] 刘国峰,刘钦,李博等.油气勘探地震资料处理GPU/CPU协同并行计算.地球物理学进展,2009,24(5) :1671-1678 Liu G F,Liu Q,Li B,et al.GPU/CPU coprocessing parallel computation for seismic data processing in oil and gas exploration.Progress in Geophys.(in Chinese),2009,24(5) :1671-1678

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心