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对VSP资料进行偏移成像可提高井附近地下结构的成像分辨率。本文给出了一种基于局域化相空间波场分解的VSP偏移成像方法。此方法采用了基于Gabor-Daubechies紧标架的延拓算子(G-D延拓算子)及其高频渐近形式对相空间波场进行延拓;基于局部平面假设,提出了一种局部角度域相关成像条件。合成和实际VSP资料的偏移成像结果表明,在满足渐近展开的条件下利用G-D延拓算子的高频近似式能够有效的减少计算时间;采用局部角度域相关成像条件能够在不增加计算量的同时,有效减弱VSP成像剖面上的偏移假象。
Offset imaging VSP data can improve the resolution of subsurface structures near wells. This paper presents a VSP migration imaging method based on localized phase space wavefield decomposition. In this method, the extended operator (GD continuation operator) based on the Gabor-Daubechies compact frame and its high-frequency asymptotic form are used to extend the phase space wavefield. Based on the local plane assumption, a local angle Domain-related imaging conditions. The imaging results of the synthetic and actual VSP data show that using the high-frequency approximation of GD continuation operator under the asymptotic expansion can effectively reduce the computation time. Using the local angle domain correlation imaging condition, While effectively reducing the offset artifacts on the VSP imaging profile.