庐枞矿集区大地电磁法的远参考效果研究  

Ore cluster area of Luzong magnetotelluric(MT)method of remote reference research

作　　者：徐志敏[1,2] 辛会翠[3] 吕扶君 

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]西北综合勘察设计研究院,西安710003 [3]陕西能源职业技术学院,咸阳712000

出　　处：《地球物理学进展》2014年第4期1822-1830,共9页Progress in Geophysics

摘　　要：庐枞矿集区大地电磁测深(MT)数据受强烈的工业、通讯、矿山、民用等电磁干扰,致使资料数据离差大、曲线形态畸变、可信度差,本文从大地电磁测深张量阻抗计算表达式出发,分析了噪声对张量阻抗估计产生的影响.选用本区质量较好的MT数据作为"远参考点",应用远参考方法处理庐枞MT数据,研究其对卡尼亚电阻率-相位曲线的改善效果,以及对数据相干度和信噪比的改善效果,并提出磁场信号的相关性是远参考处理的关键因素.The Luzhong ore cluster area magnetotelluric sounding（MT） data from the strong electromagnetic interference,such as industrial,communication,mining,civil,resulting in poor data from the large,curved shape distortion,credible difference,this article from magnetotelluric impedance tensor calculation expression,and analyze the impact of noise on tensor impedance estimation.Selection of MT data of good quality in the area as a＂remote reference point＂,Luzhong MT data remote reference method is applied to examine its effect on apparent resistivity curves-phase improvement,as well as the degree of coherence and SNR improvement effect,and magnetic field signal correlation is key element of remote reference.

关 键 词：大地电磁测深 远参考法 近源干扰 卡尼亚电阻率-相位曲线 相干度 信噪比 

分 类 号：P631[天文地球—地质矿产勘探]