基于改进的拉普拉斯滤波逆时偏移的地震剖面去噪方法

基于改进的拉普拉斯滤波逆时偏移的地震剖面去噪方法，包括采集地震数据，得到RTM成像结果，利用改进拉普拉斯滤波进行去噪。本发明针对应用拉普拉斯滤波在成像剖面上常存在同相轴不连续和噪音残留问题，在分析低频噪音产生机制、拉普拉斯滤波方法的基本原理及存在问题的基础上，提出了只选取二阶微分近似法线方向分量、省略二阶微分的近似平行方向分量的拉普拉斯滤波算子进行滤波处理，并在波数域验证了它的理论可行性。简单和复杂模型数据试算表明，改进的拉普拉斯算子滤波效果明显，可在更好地消除背向反射波产生的成像噪音的同时保持有效信号的同相轴连续性和振幅特性。 A seismic section denoising method based on improved Laplacian filtering reverse time migration comprises the steps of collecting seismic data, obtaining an RTM imaging result, and conducting denoising through improved Laplacian filtering. In order to solve the problems of discontinuity of events and noise residue on an imaging profile by applying Laplacian filtering, on the basis of analyzing a low-frequency noise generation mechanism and the basic principle and existing problems of a Laplacian filtering method, the low-frequency noise generation mechanism and the Laplacian filtering method are analyzed. A Laplacian filtering operator which only selects a second-order differential approximate normal direction component and omits a second-order d