广义屏深度偏移方法的应用效果分析

Generalized screen depth migration method and its application

1. 成都理工大学,四川成都610059;2. 杭州石油地质研究所,浙江杭州310023;3. 胜利石油管理局物探公司,山东东营257100

1. Chengdu University of Technology,Chengdu 610059,China;2. Hangzhou Institute of Oil Geology,Hangzhou 310023,China;3. The Geophysical Prospecting Company,Shengli Petroleum Administration,Dongying 257100,China

为了解决复杂介质条件下的成像问题,从原理上简要介绍了近年来广受地球物理学界关注的广义屏深度偏移方法。方法是基于波的散射理论并借助于局部Born近似导出,是在空间域和波数域交替进行波场延拓的双域偏移方法,具有较高的计算效率 1。

To solve the imaging problems in complicated media, the author briefly discusses the principle of generalized screen migration, which is paid close attention recently in the circle of geophysicists. Based on the theory of scattering wave, this method is deduced by means of local Born approximation. It is implemented in dual (space and wavenumber) domain with high efficiency. Moreover, the generalized screen operator works in media with laterally varied velocity, and can image reflectors with steep dip accurately. Poststack depth migration results from numerical tests of synthetic data with strong varied velocity and field data show that the generalized screen operator has great application value in imaging the complex geological bodies.