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针对低信噪比地震记录,研究利用二次小波变换对面波及随机干扰波进行压制。首先采用二次小波变换分离弱反射信号,在压制干扰的同时最大程度的保留有效波信息;其次在阈值收缩过程中,采用余弦非线性阈值算法,对收缩因子加入光滑函数φ,一定程度上克服了传统阈值在小波逆变换中的畸变性。通过理论数据的算例及对某油田的实际炮记录的处理来看,该方法在有效压制干扰波的同时,较好地保留了有效反射波的信息。
Aiming at the low S / N ratio seismic records, the study applies the quadratic wavelet transform to suppress the surface waves and the random disturbance waves. First of all, the second-order wavelet transform is used to separate the weakly reflected signal and suppress the interference while preserving the effective wave information to the greatest extent. Secondly, in the threshold shrinkage process, the cosine nonlinear threshold algorithm is adopted to add the smooth function φ to the shrinkage factor, to a certain extent The Distortion of Traditional Threshold in Wavelet Transform. According to the example of theoretical data and the processing of the actual shot record of an oilfield, the proposed method effectively suppresses the interference wave and retains the information of the effective reflected wave well.