测井技术2017，Vol.41Issue(2)：194-198,5.DOI:10.16489/j.issn.1004-1338.2017.02.012
基于Matlab自然伽马测井曲线小波降噪算法研究
On Natural Gamma Logging Curve Wavelet De-noising Algorithm Based on Matlab
林坤 1马朝选 1彭晓光 1李军科1
作者信息
- 1. 中国船舶重工集团公司第七一八研究所,河北 邯郸 056027
- 折叠
摘要
Abstract
The theory of wavelet transform algorithm is analyzed,and the judgment criterion of wavelet de-noising algorithm and the signal de-noising model are established.At the same time,the wavelet threshold noise reduction is studied and discussed.By analyzing the common methods of signal de-noising,methods of Fast Fourier Transform and wavelet threshold de-noising are used to de-noise and compared.In the wavelet threshold de-noising method,three kinds of determined threshold value from the original signal (global threshold,penalty threshold and Birge-Massart threshold) and four kinds of sample-based estimation of the threshold (rigrsure threshold,sqtwolog threshold,heursure threshold and minimaxi threshold) are used to compare and analyze the de-noising effects.Wavelet threshold de-noising method is superior to the Fast Fourier Transform de-noising method.Four performance indicators of the signal-to-noise ratio,correlation coefficient and noise signal energy ratio and the original signal mean square error are compared.Rigrsure adaptive soft threshold wavelet de-noising method for natural gamma ray logging curve is used.This method can effectively remove the statistical fluctuation and the burr interference in the natural gamma logging curve,it can obtain best noise reduction effect and get good application in the natural gamma logging curve noise reduction processing.关键词
自然伽马测井/小波降噪/分解层数/阈值函数/阈值/小波基/小波变换Key words
natural gamma logging/wavelet de-noising/decomposing level/threshold function/threshold/wavelet base/wavelet transform分类
天文与地球科学引用本文复制引用
林坤,马朝选,彭晓光,李军科..基于Matlab自然伽马测井曲线小波降噪算法研究[J].测井技术,2017,41(2):194-198,5.
