第二代Curvelet变换压制面波方法

摘要

In view of the loss of effective signal of conventional ground-roll removal techniques, in this paper we develop a new multi-scale and multi-directional method of removing ground roll based on the second generation Curvelet transform. Firstly, the seismic data is assigned to multiple scales and directions by Curvelet transform. According to different characteristics of ground rolls and waves in different scales and different directions, a flow of ground-roll removal based on multi-curvelet transform is devised. Making full use of the characteristic of non-overlapping in Curvelet domain,Curvelet coefficient that only contains ground rolls is processed. Finally we get the ground roll removal data. Applying this method to synthetical data and real field data sets indicates that it can suppress ground rolls,meanwhile,also greatly maintain signals. The method is proved to be an effective and preserved-amplitude denoising approach.%鉴于现有去除面波方法会损害有效信号,本文提出了一种基于第二代曲波变换压制面波的方法.该方法将地震数据分为多个尺度和方向,根据有效波和面波在不同尺度不同方向特征的差异,设计了多级曲波变换压制面波的流程,该方法充分利用有效波和面波在曲波域不重叠的特性,仅对含面波的尺度和方向上的曲波系数进行处理,最终获得压制面波后的地震数据.模型及实际资料处理结果表明,该方法能够在压制面波的同时最大限度地保护有效信号,是一种有效的相对保幅去噪的方法.