应用Morlet小波进行地震资料属性提取效果分析
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摘要
Morlet小波被广泛应用于地震资料属性提取中的主要原因是Morlet小波为复小波且对高频噪声有压制作用。分析了Morlet小波的滤波机理及实现过程,指出由于Morlet小波在频域呈钟形状,决定了它不是理想滤波器。应用不含噪模型和信噪共存模型进行实例测试的结果表明,Morlet小波不能消除信噪共存频带内的噪声,并且在去噪过程中对有效波有不同程度的损害。为此指出应用Morlet小波进行地震资料属性提取不是最佳选择。
Morlet wavelet is widely used in attribute extraction from seismic data because Morlet wavelet is a complex wavelet and is capable of suppressing high frequency noises.This paper analyzed the filtering mechanism and realization of Morlet wavelet.It is pointed out that Morlet wavelet is not an ideal filter due to its bell form in frequency domain.Tests on data with and without noises show that Morlet wavelet is unable to remove the noises within the band that signals and noises coexist,and even worst the filtering process damages the effective waves.Therefore,Morlet wavelet is not the best choice for attribute extraction from seismic data.
Morlet wavelet is widely used in attribute extraction from seismic data because Morlet wavelet is a complex wavelet and is capable of suppressing high frequency noises.This paper analyzed the filtering mechanism and realization of Morlet wavelet.It is pointed out that Morlet wavelet is not an ideal filter due to its bell form in frequency domain.Tests on data with and without noises show that Morlet wavelet is unable to remove the noises within the band that signals and noises coexist,and even worst the filtering process damages the effective waves.Therefore,Morlet wavelet is not the best choice for attribute extraction from seismic data.
引文
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2曾宇清,王卫东,贺启庸.按频带顺序排列的小波包新算法及应用[J].力学学报,1998,30(2):186～192
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4丁娜,关立行,文常保.Morlet小波对于压缩机故障信号的研究[J].压缩机机术,2005(4):7～10
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6王西文,刘全新,李幼铭,等.地震信号瞬时特征在小波分频提取的方法和应用[J].石油地球物理勘探,2000,35(4):452～460
7耿春,尹成,张白林,等.Morlet复小波用于地震瞬时属性提取的研究[J].天然气工业,2007,27(增刊A):448～451
8程乾生.信号数字处理的数学原理[M].北京:石油工业出版社,1979.182～230
9曾琴琴,刘天佑.改进的小波阈值法的瞬时信息提取[J].勘探地球物理进展,2008,31(1):34～37
10张涛,危韧勇,李志勇.Morlet组合小波在振动信号滤波和包络检波中的应用[J].计算机测量与控制,2005,13(1):18～20
2曾宇清,王卫东,贺启庸.按频带顺序排列的小波包新算法及应用[J].力学学报,1998,30(2):186～192
3何岭松,李巍华.用Morlet小波进行包络检波分析[J].振动工程学报,2002,15(1):119～122
4丁娜,关立行,文常保.Morlet小波对于压缩机故障信号的研究[J].压缩机机术,2005(4):7～10
5高静怀,汪文秉,朱光明.小波变换与信号瞬时特征分析[J].地球物理学报,1997,40(5):821～832
6王西文,刘全新,李幼铭,等.地震信号瞬时特征在小波分频提取的方法和应用[J].石油地球物理勘探,2000,35(4):452～460
7耿春,尹成,张白林,等.Morlet复小波用于地震瞬时属性提取的研究[J].天然气工业,2007,27(增刊A):448～451
8程乾生.信号数字处理的数学原理[M].北京:石油工业出版社,1979.182～230
9曾琴琴,刘天佑.改进的小波阈值法的瞬时信息提取[J].勘探地球物理进展,2008,31(1):34～37
10张涛,危韧勇,李志勇.Morlet组合小波在振动信号滤波和包络检波中的应用[J].计算机测量与控制,2005,13(1):18～20
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