摘要
折射波等相干噪音严重影响子波处理、速度分析与动校正,应在叠前予以消除.本文提出了一种利用频域自适应滤波的方法,在叠前将变换到频域的输入信号,采用梯度下降算法或改进型梯度下降法调整滤波器系数(或"权系数"),在叠前消除地震资料中相干噪声.这种方法与时域相比计算量大幅度减少,自适应过程与单纯的梯度下降法相比收敛特性有很好的改善.实际资料处理结果证明本方法去噪效果明显,而且保真效果好.
Refractive wave and other coherent noise greatly disturbed wavelet processing, velocity analysis and NMO, it should be removed before stack . This article proposed a method which used self-adapting filter in frequency domain, converted the input signal to frequency domain before stack, by gradient descent algorithm or improved gradient descent algorithm, adjust filter coefficient （or weighted coefficient ）, remove the coherent noise in seismic data before stack. Compare to the method in time domain, the compute capacity reduced a lot, constringency was improved a lot compare self-adapting procedure to pure gradient descent algorithm. Practical processing results proved the method is very effective in removing noise, excellent in keeping real signal.
出处
《地球物理学进展》
CSCD
北大核心
2013年第5期2605-2610,共6页
Progress in Geophysics
关键词
自适应
频率域滤波器
叠前
相干噪音衰减
self-adapting, frequency domain filter, pre-stack, coherent noise attenuation
