Directional Deconvolution In The Frequency-wavenumber Domain For Air Gun Array Signature

Air gun array is widely used as the excitation source in marine seismic exploration.Due to the considerable length and width of the array size,coupled with the ghost reflection,signature generated from air gun array is dependent on the propagation direction,which means the signature varies both with take-off angle and azimuth.The directivity of air-gun array results in nonstationary wavelet and distorts the relation of amplitude variation with take-off angle and azimuth,thus reduces the seismic processing effect and interpretation accuracy.Based on the study of numerical simulation for air gun signature,we further explored the directional effect and its corresponding compensation,and proposed a directional deconvolution in the frequency-wavenumber domain after the analysis of the existing method.Different frequencies and wavenumbers correspond to different seismic wave propagation angles.Therefore,to remove the directional effect of air gun array,directional filter operators at different angles can be constructed and then applied to seismic data with directivity.Model-based and real data have examined the performance of the method we have proposed.