Amplitude preserved VSP reverse time migration for angle-domain CIGs extraction

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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.

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	SUN Wen-Bo
	SUN Zan-Dong
	ZHU Xing-Hui

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

Received: 2011-01-25;

Fund:

This research is fi nancially supported by National Basic Research Program of China (No. 2011CB201100) and National Department of Science and Technology (No. 2008ZX05004-006).

About author: Sun Wen-Bo is a PhD student in the College of Geophysics and Information Engineering,China University of Petroleum (Beijing). He mainly engages in the study of seismic imaging,numerical modeling, VSP vector wavefield separation,and 2.5-D electromagnetic modeling by the finite element method and inversion. He also works in the laboratory for integration of geology and geophysics.

Cite this article:

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.

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