Research Of Method To Identify And Attenuate Internal Multiples In Seismic Data

When imaging seismic data,multi-layer waves often appear in incorrect positions,and causes serious interference in the fine interpretation of seismic data,which greatly affects the imaging accuracy.Therefore,it is of great significance to study and analyze the identification and suppression of internal multiples.The research on surface-related multiple waves has become more mature in the industry.Many main processing systems have developed targeted suppression techniques.In this paper,the generation mechanism and dynamic characteristics of the internal multiples are studied,and the identification method of inter-layer multiples is comprehensively described using the actual data.Based on the same seismic data,experiments by different processing software and methods are used to analyze and predict deconvolution theory,filtering theory,and other commonly used methods of multiple suppression,including the innovative application of morphological filtering methods on actual seismic data.In the same seismic data,different methods and software's multiple suppression effect are compared and analyzed.Based on this experimental data,the following conclusions are drawn: The beamlet filtering method of the Geoeast processing system can overcome the near-path suppression defects of the high-precision Radon transform and suppress the multiple in the middle and shallow layers.The ProMAX processing system selects the appropriate sparsity factor and sparse stability factor in the Radon transform module,which also meets the requirements for high-precision Radon transform.However,the long-range multiple-wave suppression is not as good as that of the Geoeast processing system.The use of the predict deconvolution module has a good suppression of shallow multiples.The FK dip filtering method of the Omega processing system suppresses the mid-deep multiples well.The morphological filtering method can overcome the assumptions of predicting deconvolution and filtering theory,successfully suppresses shallow multiples,and effectively suppresses long-range multiples in the middle and deep layers,which can effectively preserve effective waves and improve seismic data resolution and imaging accuracy.