According to onshore seismic data, there is little difference between the interbed multiples and primary wave in velocity. It is difficult to pick up the primary velocity, and good application effect can hardly be obtained by Radon transform suppressing multiples. In the seismic data of Gaoshiti-Moxi region, Sichuan Basin, multiple noises exist in Sinian-Cambrian System, leading to the amplitude distortion of effective reflection. Then weak effective reflection is covered, resulting in the poor matching between logging synthetic seismogram and actual seismic data. In the study area, multiples are characterized by strong interference energy and a small difference in velocity with effective wave. Based on the research idea of processing and interpretation integration, primary wave velocity is picked up through the tectonic horizon constraint in time domain of velocity spectrum, so as to reduce the influences of multiples interference on velocity picking and improve the accuracy of planar and vertical velocity picking. Moreover, scanning and processing of the multiples suppression by Radon transform is performed using the stacking velocity with different weight coefficients, so as to determine the optimal matching weight factors and achieve multiples suppression with high accuracy. In Gaoshiti-Moxi region, multiples suppression is conducted on 3D seismic data, showing that the energy of multiples on the seismic profile is effectively attenuated with obvious wave group characteristics, and the correlation between logging synthetic seismogram and near-well seismic trace is greatly improved. The practical application effect indicates that this technology can effectively protect primary wave energy while suppressing multiples, able to reduce the uncertainty of suppressing multiples. The improvement in S/N ratio and imaging effect of seismic data is an effective technique to suppress onshore interbed multiples.
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