摘要
可控源音频大地电磁法(CSAMT)采用由均匀大地导出的卡尼亚视电阻率来反映地电断面的垂向变化,已经在水文地质勘查、矿产勘查、地热勘查等方面都取得了良好的效果。在远区,卡尼亚视电阻率能够客观的反映出地电断面的垂向变化;但在过渡区和近区,卡尼亚视电阻率将发生严重的畸变,不能正确反应地电断面,这种现象称为近场效应。本文目的就是通过全区视电阻率计算对近场效应进行校正,并将这个算法其应用到实际CSAMT勘查当中,获取更多有效的深部勘查数据,加大攻深找盲的力度,促进矿产资源的发现。
CSAMT has achieved good results in hydrogeological exploration,mineral exploration and geothermal exploration by using the uniformly geodetic Carya apparent resistivity to reflect the vertical variation of the geoelectric section.In the far zone,the resistivity of Carya can objectively reflect the vertical change of the geoelectric section.But in the transition zone and the near area,it would distort seriously and not react correctly of the geoelectric section,which is called the near field effect.Based on this problem,the CSAMT's Carya apparent resistivity would be used as the initial value of near field correction,then corrected by the whole area apparent resistivity formula of the electric field component,finally applied into the actual CSAMT exploration.
作者
周安
张艳军
苏佳虎
ZHOU An;ZHANG Yan-jun;SU Jia-hu(Hunan Nuclear Industry Geological Survey Institute,Changsha 410011,China)
出处
《世界有色金属》
2018年第11期273-274,276,共3页
World Nonferrous Metals