Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (3): 962-970.doi: 10.13278/j.cnki.jjuese.201503305

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Swell Noise Attenuation Methods Based on OC-Seislet Transform

Gou Fuyan1, Liu Cai1, Liu Yang1, Wang Bo1,2, Feng Xuan1   

  1. 1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China;
    2. Exploration Technology and Engineering College, Shijiazhuang University of Economics, Shijiazhuang 050031, China
  • Received:2014-09-20 Published:2015-05-26


In the process of the marine seismic acquisition, swell noise is a kind of common noise, which has low frequency, high energy, and long period. A general approach is difficult to achieve the balance between denoising and signal protection. According to the characteristics of the swell noise, we applied the OC-Seislet transform method based on wave-equation offset-continuation (OC) operator for denoising. The proposed method characterizes the complex seismic wavefield by OC operator, compresses the noise data by optimal transform-basis function, use soft threshold to separate the signals from noise in the transform domain, and then invert transform the interpolated result to the data domain so as to remove the swell noise. After applying the real data to the model, OC-Seislet transform method proves that it can remove the swell noise from the original data; meanwhile, it can protect seismic events even in a structural complex area.

Key words: offset continuation operator, OC-Seislet transform, swell noise, soft threshold

CLC Number: 

  • P631.4

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