﻿ 地震波叠前逆时偏移——模型分析与应用

# 地震波叠前逆时偏移——模型分析与应用 Seismic Wave Pre-Stack Reverse-Time Migration ——Model Analysis and Application

Abstract: According to the algorithmic difference between the seismic wave reverse-time migration technology and the conventional Kirchhoff integral method’s depth migration and one-way wave depth migration technology, we carry out several analyses of key problem on specific aspects of the reverse-time migration method. The paper starts from the theoretical model’s impulse response, and finds out the origin mechanisms of the low-frequency reverse-time noise, effectively weakening the low-frequency noise by using correlative reverse-time imaging condition with up/down going wave-field separation processing. The low-frequency reverse-time noise is eliminated afterward with relatively horizontal-amplitude preserved Laplacian operator based on diffusion filter, and this method’s processing effect is better than that of conventional high-pass filter method. What’s more, 1D reverse-time migration is carried out using different order acoustic wave equations together with 1D Kirchhoff depth migration. The computational results show that perfect application results are achieved in the reverse-time migration processing of practical land’s seismic data by considering the above factors.

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