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大家知道,当界面呈水平产状时,反射点就在炮检中点的铅垂下方,但当界面为倾斜产状时,反射点则将相对于炮检中点的铅垂下方,发生空间偏移。而且倾角越大,这个偏移也将越大。偏移的方向与界面倾向有关。实践证明,二维偏移迭加只能解决界面沿测线方向因倾角变化而引起的偏移,而对其它任意方向的偏移,则无能为力。因此,二维偏移迭加还不能做到界面的空间正确归
As we all know, when the interface is horizontal, the reflection point is vertically below the midpoint of the shot, but when the interface is inclined, the reflection point will be vertically below the midpoint of the shot, creating space Offset. And the greater the inclination, the offset will be greater. The direction of offset depends on the orientation of the interface. Practice has proved that two-dimensional offset superposition can only solve the interface along the line direction due to changes in tilt caused by the offset, while the other any direction of the shift, powerless. Therefore, the two-dimensional offset can not be superimposed on the interface space correctly returned