Research On Multiple Wave Suppression Method Based On Radon Transform

With the increasing complexity of exploration target area and the rising of marine exploration,multiple suppression has become a key and difficult problem to be solved urgently.At present,in the process of seismic data processing,multiple waves are usually regarded as noise to be suppressed.The common methods include filtering method and wave equation method.The filtering method has high computational efficiency,but it often fails to achieve satisfactory results for multiple waves generated from complex underground media.Wave equation method is completely data-driven and does not need prior information of underground media,so it can suppress multiple waves generated from complex underground media.However,this method needs full-wave field data information and has high computational cost.In this paper,a new method combining Radon transform filtering method with surface multiple attenuation(SRME)method based on wave equation is proposed.This method combines the advantages of the above two methods,effectively avoids the defects,and can meet the requirements of processing and computing efficiency for generating multiple waves in complex tectonic media.This method uses the formation mechanism of surface multiples to predict multiples.Based on the results of parabolic Radon transform corresponding to the predicted multiples and initial seismic data,an adaptive filter function is designed.The multiples information in the parabolic Radon transform domain can be obtained accurately.After inverse transformation,the seismic profiles of suppressed multiples can be obtained by subtracting them from the original seismic records.Aiming at the problem that the traditional parabolic Radon transform can form scissors-like artifacts in Radon domain due to the endpoint truncation effect of data,this paper introduces a high-resolution Radon transform based on sparse inversion theory,which can effectively suppress the effect of end-point truncation effect on Radon domain imaging accuracy.The test results show that high resolution Radon transform can improve the imaging accuracy by focusing energy in Radon domain.The test results of parabolic Radon transform combined with SRME for suppressing multiple wave show that the two methods give full play to their respective advantages,which not only improves the imaging accuracy but also improves the computational efficiency,and can deal with multiple waves generated in complex media areas.Moreover,this method has broad application prospects in surface multiple wave suppressing methods of marine data.