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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。广义屏深度偏移算子能适应速度场较强的横向变化 ,并能保证对陡倾地层的精确成像。数值试验中 ,强横向变速理论模型合成数据及实际资料的叠后深度偏移结果都表明 ,广义屏算子在复杂地质体成像方面具有较大的应用价值
In order to solve the problem of imaging under complex media conditions, a generalized method of depth of field generalization, which is widely concerned by the geophysics community, is briefly introduced in principle. The method is based on wave scattering theory and is derived by means of local Born approximation. It is a dual-domain migration method that alternates the wave field in the spatial and wavenumber domains and has high computational efficiency. The generalized depth-of-field shift operator can adapt to the strong horizontal variation of the velocity field and ensure the accurate imaging of the steeply inclined formation. In the numerical experiments, the results of the poststack depth migration of the strong lateral shift theoretical model and the actual data show that the generalized screen operator has a great value in complex geological imaging