摘要
大地电磁测深(MT)在矿产资源勘探方面应用广泛,但强人文电磁干扰严重制约了高质量的原始MT数据的获取。本文详细总结了国内常见电磁噪声源的类型,对其产生的电磁噪声特征进行分类分析;对国内外MT电磁噪声去噪方法进行对比,结合实际生产需求,总结了一套适用于高干扰矿集区快速有效的MT数据去噪施工与处理工艺。研究表明:Robust处理、远参考道技术和人工挑选是提高MT数据采集质量的有效和必要的手段,而通过理论计算,远参考站设置距离不小于3.56倍趋肤深度即可;在江苏洪泽盐盆矿集区开展的MT试验工作验证了该设定。
Magnetotelluric sounding(MT)has been extensively applied in mineral resource exploration.However,strong anthropogen-ic electromagnetic interference severely constrains the acquisition of high-quality original MT data.This study provided a detailed sum-mary of the common types of electromagnetic noise sources in China and analyzed the characteristics of electromagnetic noise they pro-duced.By comparing the methods for MT electromagnetic noise reduction at home and abroad,this study developed a rapid and effec-tive construction and processing technology for MT data denoising in high-interference ore districts based on actual production demands.The results indicate that Robust processing,remote reference technique,and manual selection are effective and necessary in enhancing MT data quality.Besides,theoretical calculations suggest that the distance between the remote reference stations should be set at 3.56-fold skin depth or above,as verified by the MT experiments in the ore district of the Hongze salt basin,Jiangsu Province.
作者
郝社锋
田少兵
梅荣
彭荣华
李兆令
HAO She-Feng;TIAN Shao-Bing;MEI Rong;PENG Rong-Hua;LI Zhao-Ling(School of Earth Sciences and Engineering,Nanjing University,Nanjing210023,China;Geological Survey of Jiangsu Province,Nanjing210049,China;School of Geophysics and Geomatics,China University of Geosciences,Wuhan430074,China;5th Exploration Institute of Geology and Mineral Resources of Shandong Province,Tai'an271000,China)
出处
《物探与化探》
CAS
2024年第1期162-174,共13页
Geophysical and Geochemical Exploration
基金
江苏省矿地融合试点项目(苏财资环[2022]19号)
江苏省地质勘查专项资金项目(苏财建[2018]96号)。
关键词
大地电磁测深
电磁噪声
去噪
远参考道
矿集区
magnetotelluric sounding(MT)
electromagnetic noise
denoising
remote reference method
ore concentration area
