联合连续小波变换和脊波变换的面波衰减方法及应用

Continuous wavelet transform and ridgelet transform joint ground-roll attenuation method and its application

(1.长安大学地测学院地球物理系,陕西西安710054；2.长安大学西部矿产资源与地质工程教育部重点实验室,陕西西安710054；3.西安交通大学电信学院波动与信息研究所,陕西西安710049)

Bao Qianzong, Department of Geophysics,College of Geology Engineering and Geomatics,Chang’an University,Xi’an 710054,China

基于炮集地震记录面波的高振幅、低频率和低速度特性及其与反射波在小波域和脊波域中分布区域不同,提出了一种衰减强干扰面波的联合一维连续小波变换和脊波变换方法。首先根据面波的高振幅和低频率特性,利用一维连续小波变换的时频局部化性质,对强干扰面波进行衰减；然后利用脊波变换将地震记录变换到时间、尺度和射线参数的三维空间；最后在脊波域对剩余干扰进行衰减。合成记录和实际资料处理的应用表明该方法不仅可以较好地衰减地震记录中的干扰面波,而且可以保护有效信号的低频成分,为地震资料后续处理和分析提供更好的保证。

Based on the high amplitude,low frequency and low speed characteristics of ground-roll,and according to the distribution characteristic of ground-roll and reflection wave in wavelet domain and ridgelet domain,a ground-roll attenuation method joint one-dimensional continuous wavelet transform and ridgelet transform is proposed.Firstly,according to the low frequency and low speed characteristics of ground-roll,one-dimension continuous wavelet transform is used to attenuate high energy ground-roll based on its time-frequency localization properties.Then,ridgelet transform is applied to transform the seismic data to 3D space on time,scale and ray parameters.Finally,the residual ground-roll is attenuated in ridgelet domain.The processing results of synthetic and actual data show that the method is effective in attenuating ground-roll,and can preserve low frequency component of the reflection wave, which provides better foundation for continuous data processing and analysis.

10.3969/j.issn.1000-1441.2011.04.009