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小波变换压制噪声在单道地震资料处理中的应用
林兆彬,胡毅,郑江龙,蔺爱军
0
(国家海洋局第三海洋研究所,福建 厦门 361005;国家海洋局第三海洋研究所,福建 厦门 361005; 中国海洋大学,山东 青岛 266100)
摘要:
海洋区域地质调查中,单道地震勘探以其高分辨率、方便快捷等优点成为揭示浅地层地质构造的重要手段之一.结合前人研究成果并出于保护信号的完整性,对低频部分的噪声采用带通滤波进行滤除,而对高频信号中的随机噪声采用小波阈值去噪方法进行压制处理.在小波阈值去噪过程中,通过比较选用最佳小波基函数sym5对地震剖面进行三层小波分解.结果表明:两种阈值去噪方法在带通滤波的基础上进一步提升了剖面的质量,使得反射层面变得连续可追踪.软阈值去噪滤掉了剖面上的较多信息,去噪效果较为彻底,硬阈值去噪则保留了较多的细节信息.
关键词:  海洋地质学  单道地震  随机噪声  小波变换  小波基函数
DOI:
基金项目:极地专项资助项目(CHINARE01-03,CHINARE04-01,CHINARE03-03,CHINARE04-03);海洋公益性行业科研专项资助项目(201305038)
Application of wavelet transform for noise suppression in single-channel seismic data processing
LIN Zhao-bin,HU Yi,ZHENG Jiang-long,LIN Ai-jun
(Third Institute of Oceanography,SOA,Xiamen 361005,China;Third Institute of Oceanography,SOA,Xiamen 361005,China; Ocean University of China,Qingdao 266100,China)
Abstract:
Single-channel seismic exploration has become one of important means to reveal shallow geologic structure in marine geological investigations with its advantages of easy operation, high-efficient and low-cost. Based on previous research results and for the protection of the integrity of signal, the band-pass filter to filter out the random noise in the low-frequency signal and the wavelet threshold de-noising method to filter the random noise in the high-frequency signal is used. In the experiments, the sym5 wavelet is used to decompose the seismic profile by three layers of wavelet decomposition with soft and hard threshold de-noising. The results show that two threshold de-noising methods further enhance the quality of the section on the basis of the band-pass filter, which makes the reflection event become continuous tracking. The soft threshold de-noising method filters out more information on the profile, and the de-noising method effect is more thorough. And the hard threshold de-noising method retains more details.
Key words:  marine geology  single-channel seismic  random noise  wavelet transform  wavelet basis function

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