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本文针对SH地区潜山复杂介质构造成像,开展了叠前深度偏移处理的研究,提出以精细速度分析、建立正确的速度—深度模型为核心的叠前深度偏移处理的方法流程。该流程以Kirchhoff偏移理论为基础,用交互方式实现地质与地球物理的综合及处理与解释的一体化。利用文中提出的处理流程在SH地区对数条测线进行了二维叠前深度偏移,与原常规叠后时间偏移剖面相比,具有归位正确、能解决速度陷阱以及真实反映地下构造形态等特点。同时,还用实例指出二维叠前深度偏移的三维效应问题。
In this paper, we studied the processing of prestack depth migration for the imaging of buried hill complex medium in SH area, and put forward the flow of prestack depth migration processing based on fine velocity analysis and establishing the correct velocity-depth model. The process is based on Kirchhoff migration theory and uses interactivity to achieve the integration of geology and geophysics and the integration of processing and interpretation. Using the processing flow proposed in this paper, two-dimensional prestack depth migration of several lines in SH region is achieved. Compared with the conventional post-stack time migration profile, it has the advantages of homing right, resolving the velocity trap and truly reflecting the underground structure Morphology and other characteristics. At the same time, the problem of three-dimensional effect of two-dimensional prestack depth migration is also pointed out.