成功的叠前深度偏移必须要有精确的速度模型。有一种修改模型的方法是成像道集分析法。在成像道集中,如果深度偏移速度用得正确,那么所有的反射就会按水平线排列。对于倾斜反射也是这样。这 A successful prestack depth migration must have an accurate velocity model. One way to modify the model is to use imaging gathers. In the imaging corridor, if the depth migration speed is properly used, all the reflections will be arranged horizontally. The same is true for oblique reflections. This