Ground-roll separation of seismic data based on morphological component analysis in twodimensional domain  

基于形态成分分析地震信号二维域面波分离方法研究（英文）

作　　者：徐小红[1] 屈光中 张洋[1] 毕云云[1] 汪金菊[2] 

机构地区：[1]合肥工业大学计算机与信息学院,安徽合肥230009 [2]合肥工业大学数学学院,安徽合肥230009

出　　处：《Applied Geophysics》2016年第1期116-126,220,共12页应用地球物理（英文版）

基　　金：supported by the National Scientific Equipment Development Project,"Deep Resource Exploration Core Equipment Research and Development"(Grant No.ZDYZ2012-1);06 Subproject,"Metal Mine Earthquake Detection System";and 05 Subject,"System Integration Field Test and Processing Software Development"

摘　　要：Ground roll is an interference wave that severely degrades the signal-to-noise ratio of seismic data and affects its subsequent processing and interpretation.In this study,according to differences in morphological characteristics between ground roll and reflected waves,we use morphological component analysis based on two-dimensional dictionaries to separate ground roll and reflected waves.Because ground roll is characterized by lowfrequency,low-velocity,and dispersion,we select two-dimensional undecimated discrete wavelet transform as a sparse representation dictionary of ground roll.Because of a strong local correlation of the reflected wave,we select two-dimensional local discrete cosine transform as the sparse representation dictionary of reflected waves.A sparse representation model of seismic data is constructed based on a two-dimensional joint dictionary then a block coordinate relaxation algorithm is used to solve the model and decompose seismic record into reflected wave part and ground roll part.The good effects for the synthetic seismic data and application of real seismic data indicate that when using the model,strong-energy ground roll is considerably suppressed and the waveform of the reflected wave is effectively protected.地震数据中的面波是严重降低地震资料信噪比的干扰波,它的存在影响了后续地震资料的处理与解释。本文根据地震记录中面波与反射波信号形态结构的差异,采用基于二维字典形态成分分析方法对面波噪声与反射波进行分离。根据面波信号的低频、低视速度和频散的特性,选择二维非抽样离散小波变换作为面波的稀疏表示字典,根据反射波局部相关性较强的特点,选择二维局部离散余弦变换作为反射波的稀疏表示字典,构建地震记录在联合二维字典下的稀疏表示模型并采用块协调松弛算法进行求解,将地震记录分解为反射波部分和面波部分。对合成地震信号以及实际地震资料的处理结果表明本文方法不仅能有效压制强能量的面波干扰,而且还能很好保护反射波信号的波形。

关 键 词：Ground-roll suppression morphological component analysis sparse representation two-dimensional undecimated discrete wavelet transform two-dimensional local discrete cosine transform 

分 类 号：P631.44[天文地球—地质矿产勘探]