(1. 中南大學(xué) 有色資源與地質(zhì)災(zāi)害探測湖南省重點實驗室，長沙 410083；
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410083；
3. 中南大學(xué) 地質(zhì)調(diào)查研究院，長沙 410083)
摘 要: 為了對比分析廣域電磁法、音頻大地電磁法(AMT)與可控源音頻大地電磁法(CSAMT)的勘探效果，在山東某金礦的已知地質(zhì)剖面開展了多種電磁法實驗勘探，通過對比分析在相同剖面上的實驗結(jié)果發(fā)現(xiàn)，相對于AMT而言，廣域電磁法具有淺層分辨能力高、抗干擾能力強、工作效率高等優(yōu)點；相對于CSAMT而言，則具有勘探深度大、抗干擾能力強、工作效率高等優(yōu)點。關(guān)于廣域電磁法的高頻段廣域電阻率與卡尼亞電阻率不重合現(xiàn)象、場源效應(yīng)和陰影效應(yīng)、電磁場多分量綜合利用等問題上還值得探討和研究。
關(guān)鍵字: 廣域電磁法；音頻大地電磁法；可控源音頻大地電磁法；勘探深度；抗干擾能力
（1. Key Laboratory of Non-ferrous Resources and Geological Hazard Detection, Central South University,
Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
3. Institute of Geological Survey, Central South University, Changsha 410083, China）
Abstract:A variety of electromagnetic exploration methods, involving the wide field electromagnetic method, the audio magnetotelluric method (AMT) and the controlled source audio frequency magnetotelluric method (CSAMT), were carried out on a known geologic profile of a gold mine in Shandong Province, with the purpose of comparison in the real exploration effects. Through the comparison of the exploration results, from the same section, it is found that the wide field electromagnetic method has advantages of shallow high resolution capability, strong anti-interference ability and high survey efficiency compared with AMT, and it is better than CSAMT in the exploration depth, anti-interference ability and working efficiency. However, the study and research should be moved further including the inconsistency phenomenon between the wide field electromagnetic resistivity and the Cagniard resistivity at high frequency, source effect and static effect, and the utilization of electromagnetic multi-components.
Key words: wide field electromagnetic method; AMT; CSAMT; exploration depth; anti-interference ability
