三维叠前深度偏移的准三维算法研究

介绍了目前叠前偏移方法的研究状况，引入准三维算法的概念并对其进行了讨论，同时对共方位角偏移算子作了详细的介绍，最后，给出了运用共方位角偏移算子在实际中的应用结果，认为共方位角方法具有运算速度快，适应范围大的优点，有较好的研究开发前景。

THE PSEUDO-3-D METHOD OPERATOR FOR 3-D PRESTACK DEPTH MIGRATION

Kirchhoff methods are usually preferred over methods based on wavefield extrapolation because of their flexibility in handling 3 D prestack data geometries, and their high computational efficiency. The main shortcoming of it is poor subsurface imaging in complicated geological structure. In contrast, methods base on wavefield extrapolation can be leading to more accurate subsurface imaging, but its computational efficiency is much lower than that of Kirchhoff. We introduce a new concept called pseudo 3 D method for 3 D prestack depth migration. It should have the both characters of the Kirchhoff's high computational efficiency and good subsurface imaging in complicated geological structure. We give a conclusion that common azimuth method (one of the pseudo 3 D methods) has the above merits and a bright future after we studied and developed it.