相对保幅的角度域VSP逆时偏移

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摘要本文介绍了一种改进的角度域VSP逆时偏移方法。对VSP逆时偏移中的逆推公式进行了改进，为方便数值计算出相对保幅的角度域共成像点道集（ADCIGs）。此外VSP记录到的波场信息丰富，包括上行波场、下行波场和直达波场等，本文分析了这些波场的响应特征，发现直达波和下行波在角度域共成像点道集（ADCIGs）上都产生了成像噪音，直达波产生的噪音尤为严重。我们用该方法用于我国西部地区实际观测的VSP资料，不仅获得相对保幅角度域共成像点道集（ADCIGs），而且压制了成像噪音。通过数值模型试算，实际资料的应用验证了该方法的实用性与有效性，从而为VSP偏移速度分析、VSP AVA/AVO分析和反演等提供可靠的基础资料。

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	孙文博
	孙赞东
	朱兴卉

关键词： VSP逆时偏移角度域共成像点道集保幅性

Abstract： An improved method of generating angle-domain common-image gathers (ADCIGs) by VSP reverse time migration (RTM) is introduced in this paper. The formula which is used to compute the receiver wavefield for VSP RTM is modified by adding an amplitude correction term in order to conveniently output amplitude-preserved ADCIGs. Compared with the surface seismic data, VSP data contains much richer wavefields.However, the direct and downgoing waves can bring about serious imaging artifacts in ADCIGs, especially the direct wave. The feasibility and validity of this method is demonstrated by both numerical and real VSP data from western China. Thus, the ADCIGs from this method can provide reliable basic data for VSP migration velocity analysis, VSP AVO/AVA analysis, and inversion.

Key words： VSP reverse time migration angle-domain common-image gathers (ADCIGs) amplitude preservation

收稿日期: 2011-01-25;

基金资助:

国家“973计划”（编号：2011CB201100）和国家科技重大专项项目（编号：2008ZX05004-006）联合资助。

引用本文:

孙文博,孙赞东,朱兴卉. 相对保幅的角度域VSP逆时偏移[J]. 应用地球物理, 2011, 8(2): 141-149.

SUN Wen-Bo,SUN Zan-Dong,ZHU Xing-Hui. Amplitude preserved VSP reverse time migration for angle-domain CIGs extraction[J]. APPLIED GEOPHYSICS, 2011, 8(2): 141-149.

[1]	Brandsberg-Dahl, S., de Hoop, M. V., Ursin, B., 1999, Veloeity analysis in the common Scattering-angle/azimuth domain: 69th Ann. Internat. Mtg., Soc. of Expl. Geophys., Expanded abstracts , 1715 ? 1718
[2]	de Bruin, C. G. M., Wapenaar, C. P. A., and Berkhout A. J., 1990, Angle-dependent reflectivity by means of prestack migration: Geophysics, 55, 1223 ? 1234.
[3]	Fomel, S., 2004, Theory of 3-D angle gathers in wave-equation imaging: 74th Ann. Internat. Mtg., Soc. of Expl. Geophys., Expanded abstracts, 1053 ? 1056.
[4]	Mosher, C., Jin, S., and Foster, D., 2001, Migration veloeity analysis using common angle image gathers: 71st Ann. Internat. Mtg., Soc. of Expl. Geophys., Expanded abstracts, 889 ? 892.
[5]	Prucha, M., Biondi, B., and Symes, W., 1999, Angle-domain common image gathers by wave-equation migration: 69th Ann. Internat. Mtg., Soc. of Expl. Geophys., Expanded abstracts, 824 ? 827.
[6]	Sava, R. and Fomel, S., 2003, Angle-domain common-image gathers by wavefield continuation methods: Geophysics, 68, 1065 ? 1074.
[7]	Sava, R. and Fomel, S., 2006,Time-shift imaging condition in seismic migration: Geophysics, 71(6), S209 ? S217.
[8]	Sun, W. and Sun, Z., 2010, Angle-domain VSP reverse-time migration and its application: 80th Ann. Internat. Mtg., Soc. of Expl. Geophys., Expanded abstracts, 4339 ? 4343.
[9]	Xu, S., Chauris, H., Lambaré, G., and Noble, M., 2001, Common-angle migration. A strategy for imaging complex media: Geophysics, 66, 1877 ? 1894.
[10]	徐升, Lambaré, G., 2006, 复杂介质下保真振幅Kirchhoff深度偏移: 地球物理学报, 49(5), 1431 ? 1444.
[11]	Zhang Y. and Sun J., 2009, Practical issues in reverse time migration: true amplitude gathers, noise removel and harmonic source encoding. First break, 27, 53 ? 59.
[12]	张宇, 振幅保真的单程波方程偏移理论: 地球物理学报, 2006, 49(5), 1410 ? 1430.
[13]	Zhang, Y., Sun, J., and Gray, S., 2007, Reverse-time migration: amplitude and implementation issues, 77th Ann. Mtg., Soc. Expl . Geophys., Expanded abstracts, 2145 ? 2148.
[14]	Zhang, Y., Xu, S., Bleistein, N., and Zhang, G., 2007a, True-amplitude angle-domain common-image gathers from one-way wave-equation migrations: Geophysics, 72, S49 ? S58
[15]	Zhang, Y., Xu, S., Tang, B., Bai, B., Huang, Y., and Huang, T., Angle gathers from reverse time migration, The leading age, 2010, 29, 1364 ? 1371.

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