广域电磁法和可控源音频大地电磁法在生产矿山探测效果的比对——以水口山为例  

A comparison of the exploration effect of wide field electromagnetic method and controlled source audio frequency electromagnetic method in the production mine:a case study of Shuikoushan deposit

作　　者：石郝 裴婧[2] 罗振军 李柳德 

机构地区：[1]有色金属成矿预测与环境监测教育部重点实验室,湖南长沙410083 [2]中南大学地球科学与信息物理工程学院,湖南长沙410083 [3]湖南省有色地质勘查研究院,湖南长沙410000 [4]中南大学庄胜矿冶研究院,湖南长沙410083

出　　处：《矿产与地质》2017年第4期766-772,共7页Mineral Resources and Geology

基　　金：湖南省有色地质勘查局"水口山矿区物探方法有效性研究项目"(2015~2017年)资助

摘　　要：为了优选适合在生产矿山开展探矿工作的人工源频率域电磁法,在已知地质剖面上开展了广域电磁法和可控源音频大地电磁法(CSAMT)的试验勘探。在施工条件和参数相近的情况下,对比两种方法的信号强度、抗干扰能力、施工效率、成本和探测效果。广域电磁法采用伪随机信号、只测量水平电场分量,在电场信号强度相近的情况下,其相比于可控源音频大地电磁法抗干扰能力更强,工作效率提高至少7倍,成本更低,探测效果与已知地质资料吻合度更高。试验结果表明,在强干扰的金属矿区,广域电磁法有更好的应用前景。In order to determine the optimal artificial source frequency domain electromagnetic method for the exploration works in the production mine,the wide field electromagnetic method and the controlled source audio frequency magnetotelluric method(CSAMT)were applied inarea in which geological profile was known.When construction conditions and parameters were similar,the two methods were compared in terms of signal strength,anti-interference ability,construction efficiency,cost and detection efficiency.Wide field electromagnetic method used pseudo random signal to measure the horizontal electric field component only in the electric field.With similar signal strength,wide field electromagnetic method showed better anti-interference ability than controlled source audio frequency magnetotelluric method did,and the work efficiency was at least seven times higher with lower cost,and the measurement effect was more consistent with the known geological data.The experimental results showed that the wide field electromagnetic method had better application prospect in the metal mining area with strong interference.

关 键 词：广域电磁法 CSAMT 电磁干扰 方法对比 水口山铅锌矿 

分 类 号：P631[天文地球—地质矿产勘探]