应用地球物理(英文版)
應用地毬物理(英文版)
응용지구물리(영문판)
APPLIED GEOPHYSICS
2011年
2期
141-149
,共9页
VSP%reverse time migration%angle-domain common-image gathers (ADCIGs),amplitude preservation
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 ADC1Gs.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.
