CSAMT法供电场源的选取与探讨——以广西武宣县盘龙铅锌矿区为例  

Power supply field source selection and discussion of controlled source audio-frequency magnetotellurics:a case study of Panlong lead-zinc mining area in Wuxuan county,Guangxi

作　　者：莫亚军 区小毅 黎海龙 杨富强 陆怀成 MO Yajun;OU Xiaoyi;LI Hailong;YANG Fuqiang;LU Huaicheng(Guangxi Geophysical Investigation Institute,Liuzhou 545005,China;China ASEAN Geoscience Cooperation Center(Nanning),Nanning 530023,China)

机构地区：[1]广西壮族自治区地球物理勘察院,柳州545005 [2]中国-东盟地学合作中心(南宁),南宁530023

出　　处：《物探化探计算技术》2021年第3期367-373,共7页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：全国危机矿山接替资源找矿项目([2007]63号);广西壮族自治区地质矿产勘查开发局部门预算科研项目(桂地矿科[2013]40号)。

摘　　要：在可控源音频大地电磁法(CSAMT)工作中,采集到的数据往往会受到场源效应的影响,因此对于供电场源的选取是CSAMT野外工作的重点和难点之一。简要阐述了造成场源效应的原因及相关理论,通过在广西武宣县盘龙铅锌矿区实践生产中开展的对比试验,分析探讨了不同供电场源对电磁场、视电阻率及阻抗相位的影响特征,并进行了数据处理及相关的改正计算。为该研究区以及其他地质条件复杂、人文干扰严重的地区,开展CSAMT工作时对于供电场源的选取提供了参考。In the work of CSAMT,the collected data is often affected by the additional effect of the field source,so the selection of the field source is one of the key and difficult points in the field work of CSAMT.Author expounds the causes source additional effect and related theory,through the Wuxuan of Guangxi Panlong contrast experiment in the production of lead-zinc mine practice analysis.The different power supply source of electromagnetic field,the influence of the apparent resistivity and impedance phase characteristics are discussed in this paper,and as well as the data processing and the relevant correction calculation.The present study provides a reference for the selection of power source when CSAMT is carried out in this research area and other areas with complex geological conditions and serious human disturbance.

关 键 词：可控源音频大地电磁法 供电场源 场源效应 近场校正 

分 类 号：P631.3[天文地球—地质矿产勘探]