Prestack Gaussian beam depth migration under complex surface conditions

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Abstract In areas with a complex surface, the acquisition and processing of seismic data is a great challenge. Although elevation-static corrections can be used to eliminate the influences of topography, the distortions of seismic wavefields caused by simple vertical time shifts still greatly degrade the quality of the migrated images. Ray-based migration methods which can extrapolate and image the wavefields directly from the rugged topography are efficient ways to solve the problems mentioned above. In this paper, we carry out a study of prestack Gaussian beam depth migration under complex surface conditions. We modify the slant stack formula in order to contain the information of surface elevations and get an improved method with more accuracy by compositing local plane-wave components directly from the complex surface. First, we introduce the basic rules and computational procedures of conventional Gaussian beam migration. Then, we give the original method of Gaussian beam migration under complex surface conditions and an improved method in this paper. Finally, we validate the effectiveness of the improved method with trials of model and real data.

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	YUE Yu-Bo
	LI Zhen-Chun
	ZHANG Ping
	ZHOU Xue-Feng
	QIN Ning

Key words： complex surface local plane-wave Gaussian beam migration

Received: 2009-12-31;

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This work was supported by the National 863 Program of China (Grant No. 2007AA060502), the National 973 Program of China (Grant No. 2007CB209605), and the Graduate Student Innovation Fund of China University of Petroleum (East China) (Grant No. S2010-1).

Cite this article:

YUE Yu-Bo,LI Zhen-Chun,ZHANG Ping et al. Prestack Gaussian beam depth migration under complex surface conditions[J]. APPLIED GEOPHYSICS, 2010, 7(2): 143-148.

[1]	Beasley, C., and Lynn, W., 1992, The zero velocity layer: Geophysics, 57(11), 1435 - 1443.
[2]	Berryhill, J. R., 1979, Wave-equation datuming: Geophysics, 44(8), 1329 - 1341.
[3]	Wave-equation datuming before stack: Geophysics, 49(11), 2064 - 2066.
[4]	Bevc, D., 1997, Flooding the topography: Wave-equation datuming of land data with rugged acquisition topography: Geophysics, 62(5), 1558 - 1569.
[5]	Gray, S.H., 2005, Gaussian beam migration of common-shot records: Geophysics, 70(4), S71 - S77.
[6]	-2009, True-amplitude Gaussian-beam migration: Geophysics, 74(2), S11 - S23.
[7]	Gray, S.H., and Bleistein, N., 2009, True-amplitude Gaussian-beam migration: Geophysics, 74(2), S11 - S23.
[8]	Gray, S.H., and Marfurt, K.J., 1995, Migration from topography: Improving the near-surface image: Canadian Journal of Exploration Geophysics, 31(1-2), 18 - 24.
[9]	He, Y., and Wang, H.Z., 2002, Pre-stack wave equation depth migration for irregular topography: Progress in Exploration Geophysics (in Chinese): 25(3), 13 - 19.
[10]	Hill, N. R., 1990, Gaussian beam migration: Geophysics, 55(11), 1416 - 1428.
[11]	Prestack Gaussian-beam depth migration: Geophysics, 66(4), 1240 - 1250.
[12]	Jager, C., Hertweck, T., and Spiner, M., 2003, True-amplitude Kirchhoff migration from topograpphy: 73th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 909 - 913.
[13]	Nowack, R.L., Sen, M.K., and Stoffa, P.L., 2003, Gaussian beam migration for sparse common-shot and common-receiver data: 73th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 1114 - 1117.
[14]	Reshef, M., 1991, Depth migration from irregular surface with the depth extrapolation methods: Geophysics, 56(1): 119 - 122.
[15]	Schneider, W.A., Phillip, L.D., and Paal, E.F., 1995, Wave-equation velocity replacement of the low-velocity layer for overthrust-belt data: Geophysics, 60(2), 573 - 579.
[16]	Shragge, J., and Sava, P., 2005, Wave-equation migration from topography: 75th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 1842 - 1846.
[17]	Wiggins, J. W., 1984, Kirchhoff integral extrapolation and migration of nonplanar data: Geophysics, 49(8), 1239 - 1248.
[18]	Yang, K., Wang, H.Z., and Ma, Z.T., 1999, Wave equation datuming from irregular surfaces using finite difference scheme: 69^th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 1842 - 1846.
[19]	Yilmaz, W., and Lucas, D., 1986, Pre-stack layer replacement: Geophysics, 51(7), 1355 - 1369.
[20]	Zhu, T.F., Gray, S.H., and Wang, D.L., 2007, Prestack Gaussian-beam depth migration in anisotropic media: Geophysics, 72(3), S133 - S138.

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