海上挂网噪音的组合衰减思路及应用

Combined Attenuation Method and Application in Seismic Data with Marine Net Noise

通过对挂网噪音特征的分析,可以将其分解为两侧相对称的线性噪音和中部野值噪音两部分,并分析了它们在频谱、波速、能量等方面与背景有效信号的差别,结合噪音衰减原则和试验效果对比,将挂网噪音的衰减思路设计为频率—空间域相干噪音压制法和自适应中值滤波法相串联的两步组合衰减思路。实际数据应用效果表明,这一组合衰减思路能够对挂网噪音进行有效衰减,并且未损伤有效信号,达到了噪音衰减目的。

According to the characteristics of marine net noise,it can be decomposed into linear noise and wild values.The authors analyzed the differences of these noises and signals in spectral,wave velocity and energy.Combined with the principle of noise attenuation and test results,the attenuation method of marine net noise can be designed as the combined method of frequency-space domain coherent noise suppression and adaptive median filtering.The application of this method shows that the combined attenuation method can effectively attenuate marine net noise without any damage to the effective signal,and achieve the purpose of noise attenuation.