Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (5): 92-100.doi: 10.12108/yxyqc.20190510

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Random noise attenuation based on joint sparse representation in common offset gathers

SHI Zhanzhan1,2, XIA Yanqing1, ZHOU Huailai2, WANG Yuanjun2   

  1. 1. The Engineering & Technical College of Chengdu University of Technology, Leshan 614000, Sichuan, China;
    2. College of Geophysics, Chengdu University of Technology, Chengdu 610059, China
  • Received:2019-03-28 Revised:2019-05-20 Online:2019-09-21 Published:2019-09-16

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Abstract: Under the restriction of multiplicity and single-channel signal processing methods,the traditional onedimensional random noise attenuation method based on sparse representation faces two problems:Firstly,the single-channel signal processing method does not consider the spatial correlation of the effective signals,thus the de-noise performance degrades significantly and may damage effective waves. Secondly,the sparse representation algorithm suffers from multiplicity,and the processing results of adjacent seismic traces are quite different, which makes it difficult to adapt to the spatial variation. The waveforms in the pre-stack common offset gathers are characterized by horizontally events,and have the same two-way travel time. Therefore,each trace signal in a gather shares the universal support. In this gather,joint sparse representation was used to suppress random noise,which can balance the correlation between channels and spatial variations of signals so as to reduce the multi-solution of the algorithm. The optimal sparse representation was obtained under the same conditions for each channel participated in the calculation,so the processing result had good consistency. The results of numerical simulation and practical data trial show that the proposed method can suppress random noise and maintain the effective signal,and has a good application effect.

Key words: joint sparse representation, alternating direction method of multipliers, common offset gather, random noise attenuation, L2,1-norm misfit function

CLC Number: 

  • P631.4
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