1. Deyang Branch,E & P Research Institute SWPB,Sinopec,Deyang, Sichuan 618000, China;
2. Sinopec Key Laboratory of Multi-components Seismic Technology,Deyang, Sichuan 618000, China
Abstract:Making full use of the apparent velocity difference between seismic reflection signal and linear interference in three dimensions,the three dimensional cone filtering could obtain an effective suppression of surface waves.This filtering approach first transforms seismic data from time-space domain to frequency-wavenumber domain with three dimensional Fourier transform,and then designs a cone filter to suppress surface waves with low apparent velocity in order to preserve signals.Compared to the conventional two dimensional apparent velocities filtering,the three dimensional cone filtering uses the space distribution of seismic signal and chooses reasonable velocity values.So it could fully remove surface waves and preserve seismic signals.Moreover,for hyperbolic surface waves of far offsets in three dimension geometry,this cone filtering can also obtain good result for remove of surface waves,but the conventional two dimensional apparent velocity filtering cannot.