基于二次小波变换的地震信号去噪方法

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英文篇名：Noise-eliminated method for seismic signal based on second wavelet transform 中文刊名：石油地球物理勘探 英文刊名：Oil Geophysical Prospecting 作者：付燕 英文作者：Fu Yan.Department of Computer ; Xi'an Science and Technology I nstitute ; Xi'an City ; Shanxi Province ; 710054 ; China 中文关键词：二次小波变换 ; 地震信号 ; 随机噪声 ; 阈值 英文关键词：second wavelet transform ; seismic signal ; random noise ; threshold 出版日期：2005-04-15 机构：西安科技大学计算机系 陕西省西安市,710054 年：2005 期：02 出版单位：石油地球物理勘探

摘要

本文在Donoho的小波域阈值去噪处理方法基础上,提出一种基于二次小波变换的地震信号去噪方法,该法是对地震信号进行多尺度小波变换,然后对主要由噪声控制的尺度1上的小波系数再进行第二次多尺度小波变换,并将二次小波变换后的尺度1上的小波系数置零,将其余尺度上的小波系数重构,最后对处理后地震剖面进行小波域阈值去噪处理。通过理论模型和实际资料的处理结果表明,本文所述方法能有效地改善地震剖面处理效果,提高地震资料的信噪比
On the basis of Donoho's wavelet threshold noise-eliminated processing method,the paper presented a noise-eliminated method for seismic signal based on second wavelet transform.The multi-scale wavelet transform is carried out for seismic signal in the method,then second multi-scale wavelet transform is carried out again for wavelet coefficients in scale 1 mainly controlled by noises,zero is set for wavelet coefficient in scale 1 after second wavelet transform and reconstruction of wavelet coefficients in other scales is carried out,finally,the wavelet threshold noise-eliminated processing is carried out for seismic section after above-mentioned processing.The results of theoretical model and practical data processing showed that the method presented by the paper can effectively improve processing quality of seismic sections and S/N ratio of seismic data.

引文

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