【摘要】 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。更多还原

【Abstract】 For the low SNR seismic records,the second wavelet transform is used to suppress the surface-wave and the random noise.In this paper,firstly we use the second wavelet transform to separate the weak reflected signal,and we think this can remain the effective information while suppressing the interference wave.Second,by the process of the threshold shrinkage,we use the nonlinear threshold algorithm,it adds a smooth function φ to the shrinkage factor.To some extend,these measures overcome the distortion product of the traditional threshold in the inverse wavelet transform.Through the examples of theoretical data and processing of the actual shot recording about an oilfield,during suppressing the interference wave this method can remain the effective information preferably at the same time.更多还原