复杂构造地震数据叠前逆时偏移方法

英文篇名：Seismic Data Prestack Reverse Time Migration Approach on Complicated Construction
中文刊名：数学的实践与认识
英文刊名：Mathematics in Practice and Theory
作者：石颖 ; 柯璇 ; 田东升 ; 张惠瑜
英文作者：SHI Ying~1 ; KE Xuan~1 ; TIAN Dong-sheng~1 ; ZHANG Hui-yu~2 (1.College of Earth Sciences ; Northeast Petroleum University ; Daqing 163318 ; China) (2.Research Institute of Exploration and Development Petro China Qinghai Oilfield Company ; Dunhang 736202 ; China)
中文关键词：叠前 ; 逆时偏移 ; 高阶有限差分 ; GPU ; 随机边界条件
英文关键词：prestack ; reverse time migration ; high order finite difference ; GPU ; random boundary condition
出版日期：2013-05-23
机构：东北石油大学地球科学学院;中国石油青海石油公司勘探开发研究院;
年：2013
期：10
出版单位：数学的实践与认识

摘要

叠前逆时偏移方法可以精确成像复杂地下构造,利用高阶有限差分方法求解声波方程,并给出了满足稳定性条件的采样间隔的选取方式.利用GPU/CPU加速技术实现地震资料的叠前逆时偏移算法,极大地提高了计算效率,算法也采用随机边界条件,节约了大量存储空间.分析了速度模型变化对成像结果的影响.复杂地震数据成像的测试结果表明,所述的叠前逆时偏移算法可清晰成像陡倾角成像清晰,对盐丘边界和内部构造成像效果也较好.
Prestack reverse time migration(RTM) can image complicated subsurface construction accurately.The paper solves acoustic wave equation by high order finite difference, and the selected method for sampling interval which satisfies stability conditions is given.The paper accomplishes prestack RTM algorithm by GPU/CPU accelerating technology,which largely improves computation efficiency.Random boundary condition is adopted in algorithm, which saves much storage space.Also the paper discusses the influence of velocity model on imaging result.Tests on complicated seismic data set illustrate that,the RTM algorithm can image steep dip clearly,and can image the boundary and the inside construction of salt dome better.

引文

[1]Whitmore N D.Iterative depth migration by backward time propagation[J].53rd Annual International Meeting,SEG,Expanded Abstracts,1983,827-830.
    [2]Baysal E,Kosloff D D,Sherwood J W C.Reverse time migration[J].Geophysics,1983,48(11): 1514-1524.
    [3]McMechan G A,Migration by extrapolation of time-dependent boundary values[J].Geophysical Prospecting,1983,31:413-420.
    [4]张舒,褚艳利,赵开勇等.GPU高性能运算之CUDA[M].北京:中国水利水电出版社,2009.
    [5]Robert G Clapp.Reverse time migration with random boundaries[J].79th Annual International Meeting,SEG Expanded Abstracts,2009,28:2809-2813.
    [6]李博,刘红伟,刘国峰等.地震叠前逆时偏移算法的CPU/GPU实施对策[J].地球物理学报,2010, 53(12):2938-2943.
    [7]刘红伟,刘洪,邹振.地震叠前逆时偏移中的去噪与存储[J].地球物理学报,2010,53(9):2171-2180.
    [8]Micikevicius P.3D finite difference computation on GPUs using CUDA.Proceedings of 2nd Workshop on General Purpose Processing on Graphics Processing Units[J].Washington,D.C.,2009, 79-84.
    [9]李博,刘国峰,刘洪.地震叠前时间偏移的一种图形处理器提速实现方法[J].地球物理学报,2009,52(1): 245-252.