The denoising of reverse time migration based on the Poynting vector
LI Qin-Ci1,2, LIU Guo-Feng1,2, MENG Xiao-Hong1,2, REN Li1,2
1. Key Laboratory of Geo-detection, Ministry of Education, China University of Geosciences, Beijing 100083, China;
2. School of Geosciences and Information Technology, China University of Geosciences, Beijing 100083, China
Because of using the two-way wave equation and zero-lag cross correlation imaging condition,RTM causes unwanted artifacts.In this paper,the authors introduced a denoising method using the Poynting vector,which is one of the methods denoising the artifacts of reverse time migration.This method utilizes the difference between normal and abnormal imaging points in angles between the source and the received wave propagation direction, which is based on the uniformity between the direction of wave propagation and its Poynting vector.As for calculating the Poynting vector,the authors smoothed the Poynting vector for those unable to use the formula and employed CPU/GPU heterogeneous parallel computation for intensive computation cost.Through the two-layer velocity model and Marmousi velocity model denoising image with different denoising angle ranges,the authors have reached the conclusion that the smoothing method used in this paper can improve the stability of Poynting vector calculation,that the application of CPU/GPU heterogeneous parallel computation can reduce the time of calculation,that the two-layer velocity model with the 70° max denoising angle is better,and that Marmousi with the 100° max denoising angle is better.
李沁慈, 刘国峰, 孟小红, 任丽. 基于Poynting矢量的逆时偏移去噪[J]. 物探与化探, 2015, 39(6): 1223-1232.
LI Qin-Ci, LIU Guo-Feng, MENG Xiao-Hong, REN Li. The denoising of reverse time migration based on the Poynting vector. Geophysical and Geochemical Exploration, 2015, 39(6): 1223-1232.
[1] 王保利.逆时偏移与全波形反演方法及GPU超算技术研究[D].西安:西安交通大学,2012.[2] 许璐,孟小红,刘国峰.逆时偏移去噪方法研究进展[J].地球物理学进展,2012,27(4):1548-1556.[3] 刘红伟,刘洪,邹振,等.地震叠前逆时偏移中的去噪与存储[J].地球物理学进展,2010,53(9):2171-2180.[4] Baysal E,Kosloff D D,Sherwood J W C.A two-way nonreflecting wave equation[J].Geophysics,1984,49(2):132-141.[5] Loewenthal D,Stoffa P L,Faria E L.Suppressing the unwanted reflections of the full waveequation[J].Geophysics,1987,52(7):1007-1012.[6] Fletcher R F,Fowler P,Kitchenside P,et al.Suppressing artifacts in prestack reverse time migration[J].SEG,75th Annual International Meeting,2005,24(1):2049-2051.[7] Yoon K,Marfurt K J.Reverse-time migration using the Poynting vector[J].Exploration Geophysics,2006,37(1):102-106.[8] Kaelin B,Gutton A.Imaging condition for reverse time migration[C]//Expanded Abstracts of 76th SEG Annual Internet Meeting,2006,25(1):2594-2598.[9] Liu F Q,Zhang G Q,Morton S A,et al.An antidispersion wave equation for modeling and reverse-time migration[C]//Expanded Abstracts of 78th SEG Annual Internet Meeting,2008,27(1):2277-2281.[10] Bulcao A,Filho D M S,Mansur W J.Improved quality of depth images using reverse time migration[C]//Expanded Abstracts of 77th SEG Annual Internet Meeting,2007,26(1):2407-2411.[11] Mulder W A,Plessix R E.A comparison between one-way and two-way wave-equation migration[J].Geophysics,2004,69(6):1491-1504.[12] Guitton A,Kaelin B,Biondi B.Least-square attenuation of reverse time migration artifacts[C]//Expanded Abstracts of 76th SEG Annual Internet Meeting,2006,25(1):2348-2352.[13] Suh S Y.Reverse time migration by fan filtering plus wavefield decomposition[C]//Expanded Abstracts of 79th SEG Annual Internet Meeting,2009,28(1):2804-2807.[14] Zhang Y,James S.Practical issues in reverse time migration:true amplitude gathers,noise removal and harmonic-source encoding[J].First Break,2009,27(1):53-59.[15] Costa J C,Silva Neto F A,Alcantara M R M,et al.Obliquity-correction imaging condition for reverse time migration[J].Geophysics,2009,74(3):57-66.[16] Dickens T A,Winbow G A.RTM angle gathers using Poynting vectors[C]//Expanded Abstracts of 81st SEG Annual Internet Meeting,2011,29(1):3109-3113.[17] Yoon K,Guo M H,Cai J,et al.3D RTM angle gathers using wave propagation direction and dip[C]//Expanded Abstracts of 81st SEG Annual Internet Meeting,2011,29(1):3136-3140.[18] 王保利,高静怀,陈文超,等.逆时偏移中用Poynting矢量高效地提取角道集[J].地球物理学报,2013,56(1):262-268.
