高斯波束深度偏移(Hill,1990,2001)是一种可替代Kirchhoff偏移和波动方程偏移的方法。它不但克服了Kirchhoff偏移不能对多次波成像的缺陷,同时又保留Kirchhoff偏移利用回转波对陡倾角构造成像的优点。它通过直接向下外推局部平面波代替单道散射波,避免了Kirchhoff偏移中固有的对不稳定噪音的偏移,可获得与波动方程偏移相当的地下成像效果。 Gaussian Beam Depth Migration (Hill, 1990, 2001) is a method that can replace the Kirchhoff migration and wave equation migration. It not only overcomes the defect that Kirchhoff migration can not image multiple waves, but also retains the advantage of Kirchhoff migration and imaging of steep-dip structures using gyroscopes. It replaces the unsteady noise inherent in the Kirchhoff offset by displacing the local plane wave directly downwards instead of a single scattered wave, yielding an underwater imaging equivalent to the wave equation shift.