小波时空变阈值去噪方法在可控震源资料处理中的应用  

Application of wavelet time-space-varying threshold denoising method in vibroseis seismic data processing

作　　者：夏洪瑞[1] 葛川庆[2] 彭涛[3] 

机构地区：[1]中石化江汉石油管理局物探公司物探研究中心,湖北潜江433100 [2]中石化江汉石油管理局科技处,湖北潜江433124 [3]中石化胜利油田胜利软件有限责任公司,山东东营257438

出　　处：《石油地球物理勘探》2010年第1期23-27,共5页Oil Geophysical Prospecting

摘　　要：鉴于常规的消除地震资料中随机噪声的增强信号或压制噪声方法的局限性,本文基于小波变换阈值去噪和加权叠加的思路,提出一种小波时空变阈值去噪方法:以逐点方差为加权叠加的权系数,通过迭代计算修正权系数得到准确的时空变方差,再进行小波阈值去噪,从而做到多道识别噪声,单道保真压噪。这种方法可消除满足高斯白噪条件和不满足高斯白噪条件的随机噪声。经理论模型和相关未叠加可控震源资料的处理证明,这种小波时空变阈值去噪方法有效而实用。Due to the limitation of the regular signal enhancement and noise elimination methods which are used to remove the noise in seismic data,in this paper based on the idea of wavelet transform threshold denoising and weighted stacking a wavelet time-space-varying threshold denoising method is presented.With point-to-point variance as weight coefficient for weighted stacking and through iterative calculation to modify weight coefficient,the accurate time-space-varying variance can be obtained,then wavelet threshold denoising is carried out,at last noise can be identified in multi-traces,and the true amplitude can be kept and the noise can be removed in single trace.With this method the random noise can be removed whether or not it meets the Gaussian white noise conditions.Theoretical modeling and related non-stacked vibroseis data processing show that the wavelet time-space-varying threshold denoising method is an effective tool and it is an applicable and practicable denoising method.

关 键 词：小波阈值去噪 小波变换 去噪方法 可控震源 时空 随机噪声 应用 加权叠加 

分 类 号：P631.443[天文地球—地质矿产勘探]