基于全区视电阻率的CSAMT应用研究——以西藏帮浦—笛给铅锌矿区为例  

Study of CSAMT application based on the full-region apparent resistivity:an example of the Bangpu-Digei lead-zinc mining area in Tibet

作　　者：张叶鹏 谢亮 李艳 严家斌[2] 王红 孔辉 ZHANG Yepeng;XIE Liang;LI Yan;YAN Jiabin;WANG Hong;KONG Hui(Geological Team No.247 of Hunan Provincial Nonferrous Metals Geological Exploration Bureau,Changsha 410129,Hunan,China;School of Geosciences and Info-physics,Central South University,Changsha 410083,Hunan,China;The Bureau of Natural Resources of Hancheng City,Hancheng 715400,Shaanxi,China)

机构地区：[1]湖南省有色地质勘查局二四七队,湖南长沙410129 [2]中南大学地球科学与信息物理学院,湖南长沙410083 [3]陕西省韩城市自然资源局,陕西韩城715400

出　　处：《矿产与地质》2020年第3期517-524,共8页Mineral Resources and Geology

基　　金：国家重点研发计划“三维精细探测与深部矿体定位”(2018YFC0603903);2018—2021专题“深部多方法多参数联合探测及反演解释技术”项目资助。

摘　　要：利用电磁场水平分量Ex和Hy推导出相应的全区视电阻率值计算公式,采用数值求解方法求取全区视电阻率的数值解,对西藏帮浦—笛给矿区实测资料进行计算。将Ex方向全区视电阻率与卡尼亚视电阻率两者互相对比分析研究,认为Ex全区视电阻率校正可加大和丰富深部信息,对于推断深部隐伏岩体形态可描述得更确切,中浅部细节刻画得更明显。依据其布置验证钻孔2个,验证结果与推断相吻合,两孔均见高品位铅锌矿化体,产于线性低阻带和高低阻过渡部位,表明了Ex全区视电阻率计算的有效性,为后期工程布置提供科学依据。In this paper,based on the horizontal components Ex and Hy of electromagnetic field,the corresponding calculation formula of full-region apparent resistivity is derived.The full-region apparent resistivity is obtained by using the numerical solution method,which is applied to calculate CSAMT survey data in Bangpu-Digei mining area in Tibet.By comparing the Ex full-region apparent resistivity with Cagniard apparent resistivity,it is considered that the full-region apparent resistivity can enrich the deep information,which is more accurate for inferring the shape of the deep concealed rock mass and more obvious for the detail of the middle and shallow parts.According to the result,two verification drilling holes are carried out,the verification results are consistent with the inference.High-grade lead-zinc mineralization bodies are found in the two drilling holes,which are located in the linear low resistance zone and the transition position of high and low resistance.It shows the effectiveness of the Ex full-region apparent resistivity calculation,and provides a scientific basis for the later engineering layout.

关 键 词：铅锌矿区 CSAMT 全区视电阻率 卡尼亚电阻率 帮浦—笛给矿区 西藏 

分 类 号：P631.3[天文地球—地质矿产勘探] P618.42[天文地球—地质学]