基于Hilbert-Huang变换的大地电磁去噪研究  

Denoising of magnetotelluric data based on Hilbert-Huang transform

作　　者：陈钧 严良俊[1,2] 周磊 CHEN Jun;YAN Liang-Jun;ZHOU Lei(Key Laboratory of oil and Gas Resources and Exploration Technology of Ministry of Education,Yangtze University,Wuhan 430100,China;Cooperative Innovation Center of Unconventional Oil and Gas,Wuhan 430100,China)

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学),湖北武汉430100 [2]非常规油气省部共建协同创新中心,湖北武汉430100

出　　处：《物探与化探》2021年第6期1462-1468,共7页Geophysical and Geochemical Exploration

基　　金：国家自然科学基金项目“储层压裂监测中可控源倾子电磁法应用基础研究”(41904077);“页岩气储层改造电磁法动态监测应用基础研究”(41774082)。

摘　　要：大地电磁信号易受噪声干扰产生近场效应,严重影响采集的信号质量。现阶段使用较为广泛的远参考-robust方法在压制近场干扰方面还有所不足。本文在使用数值模拟验证希尔伯特-黄变换(HHT)对噪声的压制效果后,将其用于处理一个近场干扰较严重的大地电磁信号,得到了较为显著的效果;同时,使用极化方向的分布函数计算电场和磁场的极化分布,也发现分布函数的高斯性得到了修复,从另一个角度验证了HHT在压制近场干扰方面的有效性。Near-field effects are liable to rise in magnetotelluric signals due to noise,which seriously affects the quality of the collected signals.The widely used remote reference method-Robust-still has some shortcomings in suppressing near-field interference.In this paper,after being verified using numerical simulation in terms of denoising effects,the Hilbert-Huang transform(HHT) was applied to a magnetotelluric signal with serious near-field interference,achieving remarkable effects.Meanwhile,the polarization distribution of the electric and magnetic fields was calculated using the distribution function of polarization directions.It was found that the distribution function was closer to a Gaussian distribution function,also verifying the effectiveness of the HHT in suppressing near-field interference.

关 键 词：HHT 大地电磁 人文噪声 近场干扰 误差分布函数 

分 类 号：P631[天文地球—地质矿产勘探]