The Research And Application Of Multiple Suppression Using AVO Prediction Method

Multiple suppression has always been the core problem in marine seismic data processing.The existence of multiple has caused the decline of signal-to-noise ratio of seismic data,the difficulty of effective wave identification,the subsequent seismic migration imaging and interpretation of artifacts.At present,multiples suppression methods are becoming more and more mature.Pressing methods can be divided into three categories:using the time difference between multiples and effective waves,using the periodicity of multiples and multiples model building.In production,the ideal effect can be achieved for most multiples by using a variety of multiple suppression methods.However,the problem often faced is that it is difficult to distinguish the time difference between the near-trace multiples and the effective waves,the periodicity is not obvious,and the offset is very small,it is difficult to build the multiples model.In addition,it is difficult to suppress multi-wave residues with small time difference in Radon domain,which has a great impact on subsequent velocity model building.In this paper,the following work is done: Firstly,based on AVO theory and LIFT(Leading Intelligence Filter Technology)theory,the basic framework of AVO prediction method for denoising or multiple wave suppression is proposed.Secondly,the AVO near-path suppression method is designed by combining frequency division denoising with AVO prediction method.In addition,a method to suppress the residual long period multiples is designed by combining the conventional Radon de-multiples method with AVO prediction technique.The validity of the method is verified by testing the model and real data.The obvious advantage of AVO prediction method is that it can suppress the maximum multiple energy on the basis of keeping the effective energy as far as possible,and improve the signal-to-noise ratio and fidelity of data.On the whole,through the study of AVO method to suppress multiple,this paper forms a set of effective solution to offshore near-track multiple and residual long-period multiple ideas,combined with practical data,formed a deep understanding of the method,the use of AVO prediction method is efficient,effective,and has good application value.