Shearlet域和TT域联合压制面波方法  

Surface wave joint suppression based on Shearlet transformation and time-time transformation

作　　者：王德营 李振春[1] 董烈乾 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《石油地球物理勘探》2014年第1期53-60,301,共8页Oil Geophysical Prospecting

基　　金：国家"973"课题(2011CB202402);国家"863"课题(2010AA0603223002)联合资助

摘　　要：面波压制是陆上地震数据处理中的重要课题之一,现有的面波压制方法仅考虑信号与噪声在某一方面的差异进行分离,不可避免的会损害部分有效信号的能量。针对这一问题,本文提出了一种基于Shearlet变换和TT(Time-Time)变换联合压制面波的方法。首先利用Shearlet变换的高尺度基函数优异的局域性和方向表征能力分离反射信号与低频、高波数的面波;然后,利用TT变换对低频良好的分辨能力,在TT域进行滤波处理,压制大部分的低频、低波数的面波成分;最后,利用Shearlet变换提取的较准确的有效信号设计TT域自适应时—空变滤波器,进一步压制残留的低频、低波数的面波成分,再反变换到时间域就得到了压制面波后的最终结果。模型和实际资料处理结果表明:与F-K滤波和单一的TT域滤波相比,本文所述方法在消除面波的同时,能够保持反射波的振幅和相位信息,是一种相对保幅的面波压制方法。The surface wave suppression is one of the most important steps in seismic data processing. However,many surface wave suppression methods damage inevitably the signal because they only consider certain different properties between signal and surface wave.Therefore,a method surface wave joint suppression method based on Shearlet transform and time-time(TT)transform is proposed in this paper.First,effective reflection wave and surface wave distributed mainly in low frequency and high wavenumber are separated by the excellent localized property and the property of directional representation of the high-scale Shearlet basis function.Then,using the excellent identification capability of TT transform,most of surface wave component of low frequency and low wavenumber are suppressed by the filtering in TT domain.After that,according to the more accurate signal extracted by the Shearlet transform,an adaptive time-variant and space-variant filter is designed to remove the residual surface wave.Finally,we transform the data back to time domain without surface wave.Applications on synthetic and real field data show that the proposed method in this paper suppresses surface wave and maintains amplitude and phase information of reflection wave.

关 键 词：SHEARLET变换 Time-Time变换 面波压制 自适应 时 空变滤波器 

分 类 号：P631[天文地球—地质矿产勘探]