改进的小波阈值法瞬时信息提取
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摘要
利用Hilbert变换提取瞬时信息是储层预测的一种常用方法,但抑制噪声的能力弱。在分析小波软、硬阈值去噪方法优缺点的基础上,引进了一种改进的阈值去噪方法。该方法可以很好地压制地震信号中高频随机噪声,且保持原信号的细节信息。在实际地震资料处理中,首先利用改进的方法去噪,然后再采用Hilbert变换提取瞬时信息,取得了较好的地质效果。
Hilbert transform is commonly used in extracting instantaneous information from signals for reservoir prediction.However,its ability in suppressing noises is weak.In this paper,we put forward an improved wavelet threshold denoising method based on an analysis of advantages and disadvantages of the hard and soft wavelet threshold denoising methods.Experiments showed this method preserves the details of the original seismic signals while suppresses the high frequency random noises in the signals.Desired results have been reached by extracting instantaneous information from the seismic signals filtered with the proposed method.
Hilbert transform is commonly used in extracting instantaneous information from signals for reservoir prediction.However,its ability in suppressing noises is weak.In this paper,we put forward an improved wavelet threshold denoising method based on an analysis of advantages and disadvantages of the hard and soft wavelet threshold denoising methods.Experiments showed this method preserves the details of the original seismic signals while suppresses the high frequency random noises in the signals.Desired results have been reached by extracting instantaneous information from the seismic signals filtered with the proposed method.
引文
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8 李淑霞,王汝霖,李春梅,等.基于噪声方差估计的小波阈值图像去噪新方法[J].计算机应用研究,2007,24(1):220~221
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2 张?,程家兴,樊甫华,等.利用Hilbert变换提取信号瞬时特征参数的问题研究[J].电讯技术,2003(4):44~48
3 刘崇春,裘正定.一种基于Morlet小波的振动信号包络提取方法[J].电路与系统学报,2000,5(1):68~71
4 陈峰,成新民.基于小波变换的信号去噪技术及实现[J].现代电子技术,2005(3):11~12
5 陈广军,张善文,李建明,等.小波分析技术在薄砂岩储集层描述中的应用[J].石油物探,2002,41(1):95~99
6 张采令.小波变换及其在地震勘探中的应用[J].石油物探译丛,1994(5):12~20
7 钟凌云,刘天佑.小波线性阈值法在航磁资料去噪中的应用[J].勘探地球物理进展,2004,27(4):280~284
8 李淑霞,王汝霖,李春梅,等.基于噪声方差估计的小波阈值图像去噪新方法[J].计算机应用研究,2007,24(1):220~221
9 冯象初,甘小冰,宋国乡.数值泛函与小波理论[M].西安:西安电子科技大学出版社,2003.158~162
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