云南澜沧老厂银铅锌多金属矿床的AMT 工频噪声
压制研究

金属矿山 ›› 2024, Vol. 53 ›› Issue (2): 189-.

云南澜沧老厂银铅锌多金属矿床的AMT 工频噪声压制研究

李柯轩^1,2,3　刘慧鹏^1,2,4　李　波¹

1. 昆明理工大学国土资源工程学院,云南昆明 650093;2. 中国有色金属工业昆明勘察设计研究院有限公司,云南昆明 650051; 3. 河南省地质局矿产资源勘查中心,河南郑州 450011;4. 云南省岩土工程与地质灾害重点实验室,云南昆明 650051

出版日期:2024-02-15 发布日期:2024-04-03
基金资助:
云南省万人计划青年拔尖人才项目(编号:YNWR-QNBJ-2018-093);昆明理工大学重点学科建设项目(编号:14078384)

Research on Power Frequency Noise Suppression of AMT in Laochang Ag-Pb-Zn Polymetallic Deposit, Lancang County,Yunnan Province

LI Kexuan^1,2,3　LIU Huipeng^1,2,4　LI Bo¹

1. Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China; 2. Kunming Prospecting Design Institute of China Nonferrous Metals Industry,Kunming 650051,China; 3. Mineral Resources Exploration Center of Henan Geological Bureau,Zhengzhou 450011,China; 4. Yunnan Key Laboratory of Geotechnical Engineering and Geohazards,Kunming 650051,China

Online:2024-02-15 Published:2024-04-03

摘要/Abstract

摘要： 云南澜沧老厂银铅锌多金属矿床为西南“三江”地区的典型矿床,面临资源危机。该矿床的边部找矿勘查中开展了音频大地电磁测深(AMT)工作,但因高压线工频干扰,导致部分测点频点失真。针对此问题,提出了一种基于隔离式频点提取以及磁场数据重构技术的工频噪声压制方法。通过划定阈值对所有测点进行数据分辨,进而快速区分受工频干扰程度不同的测点;然后避开受干扰的50 Hz 及倍数频段数据进行数据提取。针对受工频干扰程度较强,无法避开干扰数据的测点,利用其临近测点数据,采用反距离加权法对强干扰测点进行磁场数据重构。对澜沧老厂银铅锌多金属矿床的AMT 资料采用上述方法进行处理后,有效规避了50 Hz 及奇次谐波干扰,取得了较好的噪声压制效果,圈定了2 处具有找矿潜力的低阻异常区,为矿山边部找矿勘探提供了方向。该方法为解决物探工作中的工频干扰提供了新途径。

关键词: 大地电磁测深　工频干扰　隔离式频点提取　磁场重构　银铅锌多金属矿床

Abstract: Laochang Ag-Pb-Zn polymetallic deposit in Lanchang,Yunnan Province is a typical deposit in the "Sanjiang" area of southwest China,which is facing a resource crisis recently. The audio-frequency magnetotellurics(AMT) has been carried out in the margin exploration of this deposit,but the frequency distortion of some measurement points is caused by the interference of high voltage lines. To deal with this problem,a method is proposed for suppressing industrial frequency noise based on isolated frequency point extraction and magnetic field data reconstruction technology. By setting a limit to distinguish all measurement points,it can quickly distinguish the measurement points with different degrees of industrial frequency interference; then the data extraction is carried out by avoiding the interfered 50 Hz and multiples frequency band data;For the measurement points with strong industrial frequency interference that cannot be avoided,the magnetic field data reconstruction is carried out by using the inverse distance weighted for the strong interfered measurement points using the data of their nearby measurement points. The AMT data of the Laochang Ag-Pb-Zn polymetallic deposit in Lancang was processed by the above method,which effectively avoided the 50 Hz and odd times harmonic interference,achieved a relatively good noise suppression effect,and circled two low-resistance anomalous areas with ore finding potential,which provided a direction for ore finding exploration at the side of the mine. The method also provides a new solution to the industrial frequency interference in geophysical exploration work.

Key words: audio-frequency magnetotellurics,power interference,isolated frequency extraction,magnetic field reconstruction, Ag-Pb-Zn polymetallic deposit

李柯轩, 刘慧鹏, 李　波. 云南澜沧老厂银铅锌多金属矿床的AMT 工频噪声压制研究[J]. 金属矿山, 2024, 53(2): 189-.

LI Kexuan, LIU Huipeng, LI Bo. Research on Power Frequency Noise Suppression of AMT in Laochang Ag-Pb-Zn Polymetallic Deposit, Lancang County,Yunnan Province[J]. Metal Mine, 2024, 53(2): 189-.