矢量法保真去噪

Signal-retained noise elimination using vector method.

用矢量的概念和算法能比较容易地对地震信号的相关性、噪声和岩性特征进行定量描述。一个地震道矢量可由相关分量和非相关分量组成,前者反映地震信号的相似连续性,后者包含噪声和岩性的影响。噪声分量不具有倾角特性,而地震道的相关分量和岩性分量均具有倾角特性,因而利用倾角特性可以消除噪声,保留岩性分量,故称这种矢量去噪法为保真去噪法。在具体解法上,我们采用了剖分倾角微元的思想,从而成功地提取出岩性分量,实现了保真去噪。在此基础上发展了一套保真去噪方法,包括随机噪声分离、信号加强及规则噪声分离。这些方法在新疆、四川的地震资料处理中发挥了很好的作用,处理效果十分显著。

Both concept and algorithm of vector can be easy used to quantitatively de- scribe seismic signal correlation,noise and lithologic characteristic.A seismic trace vector consists of correlative component and uncorrelated component;the former re- flects similar continuity of seismic signals,and the latter contains influence resulting from noises and lithology.Noise component has no inclination characteristic,but both correlative component and lithologic component have;so inclination character- istic can be used to remove noise component but retain lithologic component.There- fore,this vector noise elimination is called signal-retained noise elimination. In solution,inclination micro element is used to extract lithologic component and to remove noise component effectively.Consequently,we have developed some methods for signal retained noise elimination,which are for random noise elimina- tion,regular noise elimination and signal enhancement,these methods play key role in noise elimination processing of the seismic data from Xinjiang and Sichuan areas. They bring good results.