【摘要】 在海上地震资料采集过程中,涌浪噪声是一种常见的噪声干扰,这类噪声一般表现为低频、强能量、长周期,使用一般的方法很难在去噪的同时达到信号保真的效果。笔者针对该噪声的特征,选取了基于波动方程炮检距连续(offset continuation,OC)算子的OC-Seislet变换方法进行消噪处理;该方法应用OC算子来表征复杂波场,对含噪声数据进行压缩,在变换域通过软阈值处理实现信噪分离,再将结果反变换到数据域,从而达到去除涌浪噪声的目的。通过对模型数据和实际数据的处理,验证了OC-Seislet变换方法能够在去除原始数据中涌浪噪声的同时,最大程度地保护复杂构造下的地震波信息。更多还原

【Abstract】 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.更多还原