Abstract：The random noise in seismic exploration is always one of key factors affecting the S/N ratio of seismic signal.Facing on the shortcoming that 1-D classic median filter has strong ability of denoise for seismic signal,which leads the useful information to be destroyed,the paper defines a window length to control threshold based on the feature of noises,then,selects adequate time-variant window to carry out median filtering according to the relationship between seismic data and the threshold, achieving the optimal balancing effect between useful signal and different strength of noises.It is shown by theoretical model processing and correlation of multiple processing methods that the method is superior to 2-D multilevel median filter in the ability of denoise and to the classic median filter in protection of useful signals.The effects of processed practical profiles also showed that the method can not only eliminate pulse noise effectively, but also protect useful signal well.
刘洋, 刘财, 王典, 李勤学, 冯晅, 王建民. 时变中值滤波技术在地震随机噪声衰减中的应用[J]. 石油地球物理勘探, 2008, 43(3): 327-332.
Liu Yang, Liu Cai, Wang Dian, Li Qin-xue, Feng Xuan, Wang Jian-min. Application of time-variant median filtering technique to attenuation of seismic random noises. OGP, 2008, 43(3): 327-332.
