用均衡干扰能量法压制线性干扰

用f-k滤波消除地震剖面的线性干扰,是地震资料处理最常用的去噪手段之一,如果应用不当则会产生负面效应,使去噪后的剖面产生新的线性干扰.究其原因,主要由于在f-k域内过分压制干扰能量,使干扰波能量之间不均衡所致.本文以一高信噪比无线性干扰的剖面和它的f-k谱为例,说明完全压制干扰能量与部分压制干扰能量的区别.从中不难发现,在前者的f-k谱上,既无明显的强干扰能量带,也无干扰为零的区域,据此提出"噪音能量均衡"的概念.应用平衡噪音能量的方法去除线性干扰,可获得较好的效果.

Linear noise reduction using noise energy equilibrium

f-k filtering for linear noise removal is one of usual methods for removing noisein seismic data processing. However, the ill use of f-k filtering will result in de-structive effect, namely, causing new linear noises in the seismic section whose o-riginal linear noise has been reduced. The reason why the new noises appear liesthat the oversuppression of original noises in f-k domain makes noise energy unbal-anced. A high S/N ratio seismic section without linear noise and its f-k spectrumare taken as examples to show the difference between full suppression of noise ener-gy and partial suppression of noise energy. It can be easy seen that neither strongnoise belt nor zero noise belt occurs in the f-k spectrum of the former case. Accord-ingly, the conception of noise energy equilibrium is advanced to remove linear nois-es, receiving quite good effect.