1. 中国石油大学(华东)地球科学与技术学院, 山东青岛 266580;
2. Earth Science of Rice University, Texas, USA 77005
A 2D control beam migration in the τ-p domain
Huang Jianping1,2, Wu Jianwen1, Yang Jidong1, Duan Xinyi1, Yuan Maolin1
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China;
2. Earth Science of Rice University, Texas 77005, USA
Abstract:Ambient noise and man-made noise are usually mixed in seismic shot gather. Based on energy difference between signal and noise in the τ-p domain, we propose a Gaussian control beam with a threshold filtering to eliminate noise during the Gaussian beam image process. The keys of the control beam method are as follows:A. A threshold is set based on the quality of the field data in the τ-p domain, and ticks off noisy data to remove random noise from field data; B. Then a windowed local slant-stack is applied on the processed field data. Theoretical analysis shows the event continuity is improved and migration artifacts are significantly suppressed because energy of events far away from the central ray path is decreased in the τ-p domain. Tests on Marmousi model and field data suggest that the proposed control beam migration can increase the migration quality for low signal to noise ratio(SNR) data.
Liu Xiwu and Liu Hong. Status and progress on wave equation migration methods.Progress in Geophysics,2002,17(4):582-591.
[2]
erveny V. Seismic Ray Theory. Cambridge:Cam-bridge University Press, 2001.
[3]
erveny V, Popov M M,Pšeník I. Computation of wave fields in inhomogeneous media-Gaussian beam approach. Geophysical Journal International, 1982,70(1):109-128.
[4]
erveny V.Synthetic body wave seismograms for laterally varying structures by the Gaussian beam method. Geophysical Journal Royal Astronomical Society,1983,73(2):389-426.
[5]
erveny V and Pšeník I.Gaussian beams and paraxial ray approximation in three dimensional elastic in homogeneous media. Journal of Geophysics,1983, 53:1-15.
[6]
erveny V. Ray synthetic seismograms for complex two dimensional and three dimensional structures.Journal of Geophysics,1985,58:2-26.
[7]
Popov M M.A new method of computation of wave fields using Gaussian beams. Wave Motion,1982,4(1):85-97.
Hale D. Migration by the Kirchhoff, Slant Stack, and Gaussian Beam Methods. Center for Wave Phenomena, Colorado School of Mines,1992, CWP-126.
[10]
Hale D. Computational Aspects of Gaussian Beam Migration.Center for Wave Phenomena,Colorado School of Mines, CWD-127.
[11]
Alkhalifah T.Gaussian beam depth migration for ani-sotropic media.Geophysics,1995,60(5):1474-1484.
[12]
Hill N R. Prestack Gaussian-beam depth migration. Geophysics, 2001,66(4):1240-1250.
[13]
Nowack R L,Sen M K,Stoffa P L. Gaussian beam migration for sparse common-shot and common-receiver data. SEG Technical Program Expanded Abstracts, 2003,22:1114-1117.
[14]
Gray S H. Gaussian beam migration of common shot records.Geophysics,2005,70(4):S71-S77.
[15]
Zhu T, Gray S H, Wang D. Prestack Gaussian-beam depth migration in anisotropic media. Geophysics, 2007,72(3):S133-S138.
[16]
Albertin U,Yingst D,Kitchenside P et al. True-amplitude beam migration. SEG Technical Program Expanded Abstracts,2004,23:945-952.
[17]
Gray S H and Bleistein N.True-amplitude Gaussian beam migration.Geophysics,2009,74(2):S11-S23.
[18]
Popov M M,Semtchenok N M,Popov P M et al. Reverse time migration with Gaussian beams and velocity analysis applications.70th EAGE Conference & Exhibition, 2008.
[19]
曹建章,朱光明.高斯束方法合成地震记录.石油地球物理勘探,1992, 27(5):593-604.
Cao Jianzhang and Zhu Guangming. Seismogram synthesis using Gaussian beam technique. OGP, 1992,27(5):593-604.
Wu Liming and Xu Yun. Applied study of Gaussian beam method in 2-D inhomogeneous media and laterally varying layered structures. Chinese Journal Geophysics,1995,38(A01):144-152.
Huang Jianping, Yang Jidong, Li Zhenchun et al. 3D Gaussian beam forward modeling for rugged tomography based on wave field approximation in effective vicinity. OGP,2015,50(5):896-904.
Yang Jidong, Huang Jianping, Wu Jianwen et al. Accuracy factors of Green function constructed with different seismic wave beams. OGP,2015,50(6):1073-1082.
Yue Yubo, Li Zhenchun, Liu Wei et al. Preserved amplitude shot domain Gaussian beam migration. Journal of China University of Petroleum(Edition of Natura Science),2011,35(1):52-55.
[28]
Yue Yubo, Li Zhenchun, Zhang Ping et al. Prestack Gaussian beams depth migration under complex surface condition. Journal of Applied Geophysics, 2010,7(2):143-148.
Huang Jianping,Yuan Maolin and Li Zhenchun et al. An accurate elastic beam migration method without slant stack for complex surface and subsurface geological conditions.GPP,2015,54(1):56-63.
[33]
Huang J P, Yuan M L. Accurate acoustic and elastic beam migration without slant stack for complex topography. Journal of Geophysics and Engineering,2015, 12:515-526.
[34]
Huang J P, Yang J D, Liao W Y et al. Common-shot Fresnel beam migration based on wave-field approximation in effective vicinity under complex topographic conditions. Geophysical Prospecting, 2015, doi:10.1111/1365-2478.12276.
Yuan Maolin, Huang Jianping, Li Zhenchun et al. Parameters optimization in local angle-domain Gaussian beam migration. GPP, 2015,54(5):602-612.
[37]
Vetle V, Graham R and Roger T. Controlled beam migration:a versatile structural imaging tool. First Break,2008, 26(9):109-113.
[38]
Casasanta L, Gray S and Grion S. Converted-wave controlled beam migration for vector-offset volumes. SEG Technical Program Expanded Abstracts,2012,31:1-5.
[39]
Casasanta L, Gray S and Grion S. Converted-wave controlled beam migration with sparse sources or receivers.75th EAGE Conference & Exhibition Incorporating SPE EUROPEC, London, UK, 2013.
[40]
Xiao Xiang, Hao Feng, Egger C et al. Orthorhombic control laser beam migration. SEG Technical Program Expanded Abstracts, 2014,33:3857-3861.