Application of pseudo-random frequency domain electromagnetic method in mining areas with strong interferences  

伪随机频率域电磁方法在强干扰矿区的应用（英文）

作　　者：Yan-fang HU Di-quan LI Bo YUAN Guang-yun SUO Zi-jie LIU 胡艳芳;李帝铨;袁博;索光运;刘子杰(中南大学有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083;中南大学有色资源与地质灾害探测湖南省重点实验室,长沙410083;中南大学地球科学与信息物理学院,长沙410083;核工业二三〇研究所,长沙410011)

机构地区：[1]Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education,Central South University,Changsha 410083,China [2]Hunan Key Laboratory of Nonferrous and Geological Hazard Detection,Control South University,Changsha 410083,China [3]School of Geosciences and Info-Physics,Central South University,Changsha 410083,China [4]Research Institute No.230,CNNC,Changsha 410011,China

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第3期774-788,共15页中国有色金属学报（英文版）

基　　金：Project(2018YFC0807802)supported by the National Key R&D Program of China;Project(41874081)supported by the National Natural Science Foundation of China

摘　　要：Due to the strong electromagnetic interferences and human interference,traditional electromagnetic methods cannot obtain high quality resistivity data of mineral deposits in Chinese mines.The wide field electromagnetic method(WFEM),in which the pseudo-random signal is taken as the transmitter source,can extract high quality resistivity data in areas with sever interference by only measuring the electric field component.We use the WFEM to extract the resistivity information of the Dongguashan mine in southeast China.Compared with the audio magnetotelluric(AMT)method,and the controlled source audio-frequency magnetotelluric(CSAMT) method,the WFEM can obtain data with higher quality and simpler operations.The inversion results indicate that the WFEM can accurately identify the location of the main ore-body,which can be used for deep mine exploration in areas with strong interference.为了寻求生产矿山深边部找矿的有利手段,在安徽冬瓜山铜矿区进行多种电磁方法的对比研究。由于该地区受到严重的人文电磁干扰,传统的电磁法无法取得有效的数据。然而,广域电磁法(WFEM)采用伪随机信号作为发射源,只需测量一个电磁场分量便可达到勘探效果,具有抗干扰能力强、工作效率高的优点。将广域电磁法应用于冬瓜山矿区,对比分析音频大地电磁法(AMT)、可控源音频大地电磁法(CSAMT)和WFEM的原始数据。结果表明,WFEM在强干扰矿区能获得高质量的数据,其反演结果对主矿体位置的反映与已知资料结果吻合,说明WFEM是一种强干扰矿区深边部找矿的有利手段。

关 键 词：pseudo-random signal frequency domain electromagnetic method wide field electromagnetic method(WFEM) strong interference anti-interference capability Dongguashan copper deposit 

分 类 号：P631.325[天文地球—地质矿产勘探]