The finite difference depth migration equation in space-frequencydomain can be derived when the radical expression is approximated by continued fraction.
采用连分式近似，可以得到空间频率域的有限差分深度偏移方程。
2
Then two conventional envelope migration compensation algorithm was introduced, on this basis, a new algorithm called frequencydomain correction was proposed.
A new method which using two order keystone transform to correct quadratic migration and frequencydomain correction to correct once migration was proposed.