压制叠前相干噪音的速度变换域滤波方法  

Prestack coherent noise suppression via filtering in different velocity domains

作　　者：吕景贵[1] 刘振彪[1] 管叶君[1] 陈存衍[1] 

机构地区：[1]大庆石油管理局物探公司,大庆163357

出　　处：《石油物探》2001年第4期94-99,112,共7页Geophysical Prospecting For Petroleum

摘　　要：叠前压制相干噪音是地震资料处理技术研究中的重要课题之一。由于各种相干噪音具有不同的特性 ,所以必须采用不同的压制方法。本文提出的压制叠前相干噪音的速度变换域滤波方法 ,依据叠前地震资料中折射波以及各种形式的面波与视速度或叠加速度存在不同关系这一特征 ,有针对性地选择叠前道集的相应速度变换域进行有针对性的滤波 ,从而不仅可以对相应的噪音进行有效的压制 ,而且可以使有效信号得到较好的保护。将此法用于实际资料处理 ,效果明显。Prestack coherent noise elimination is an important study topic in seismic data processing. Different noise elimination methods should be adopted due to the distinct characteristics of various coherent noises. This paper presents a method that suppresses prestack coherent noises via filtering in different velocity domains. The method is based on the fact that in the prestack data, the relationships between refracted waves and various surface waves with apparent velocities or stack velocities are varied. Thus, different filtering may be carried out in different domains in accordance with the different gathers. The method not only can effectively suppress prestack coherent noises, but also can prevent efficient signals from attenuation. Satisfactory results have been obtained by applying this method to real data processing.

关 键 词：叠前相干噪音 非线性滤波 奇异值分解 速度变换 地震勘探 

分 类 号：P631.443[天文地球—地质矿产勘探]