Abstract:After normal moveout (NMO) correction of a CDP gather, multiples have residual moveout 8t, which varies parabolically as a function of shot-receiver distance。The distribution of residual wave number Ok of multiple can be derived from the changes of 8t。Therefore, a desirable complex stacking residual response of wave number is designed, the weight of each stacked trace is derived with Fejer polynomial approximation and then the NMO corrected CDP gather is weighted stacked. The complex stacking residual response of wave number can be changed with the change of 8t on the t-x plane and there by the weight of each trace can also be changed to yield optimum results in suppressing multiples.