摘要
在基岩山区进行大地电磁测深勘探,经常受到静态效应影响。地表电阻率不均匀或地形起伏使测深曲线不规则,断面等值线图上出现密集垂直分布的等值线,掩盖或混淆了实际探测目标体产生的异常,给资料解释带来很大的困扰。大地电磁测深矢量测量包含TE和TM极化模式信息,两种极化模式获得的ρyx和ρxy卡尼亚视电阻率曲线特征及相互关系与地下电性结构有关。研究各种静态效应对两种极化模式的测深曲线影响规律,总结两种曲线的组合特征,可以识别静态效应,分离干扰,准确获得地下地质构造的信息。实例证明基岩山区大地电磁法工作中,利用ρxy和ρyx卡尼亚视电阻率曲线异常特征和影响规律共同解释可以获得较好的地质效果。
The exploration of MT(magnetotelluric)in mountain area is usually affected by steady effect and uneven resistance of near-surface soil.The result would show irregular sounding curves or vertical distributed level lines.This disturbs the explanation.In field data collection,the data includes two types of polarization,TE and TM.Each type of data would present sounding curve,ρyx andρxy.The curve’s characteristics and correspondence to each other are related to the electrical underground structure.The research of the local abnormal near surface and geography upon curves affection is meaningful for disturbers,to get correct geological structure underground.The example of real work indicates that in MT field data collection,it is necessary to collect two types of polarization data.The co-explanation ofρxy andρyx curves would get satisfied geology result.
作者
程勃
罗润林
李尔頔
吕玉增
CHENG Bo;LUO Run-lin;LI Er-di;LYU Yu-zeng(College of Earth Sciences,Guilin University of Technology,Guilin 541006,China;Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration,Guilin University of Technology,Guilin 541006,China)
出处
《桂林理工大学学报》
CAS
北大核心
2020年第2期299-309,共11页
Journal of Guilin University of Technology
基金
国家自然科学基金项目(41764005,41674075)
广西自然科学基金项目(2016GXNSFGA380004,2015GXNSFAA139241,2014GXNSFBA 118232,2014GXNSFAA118305)
广西有色金属隐伏矿床勘查及材料开发协同创新中心创新团队项目(GXYSXTZX2017-Ⅱ-5)
广西高等学校千名中青年骨干教师培育计划项目
广西高等学校高水平创新团队及卓越学者计划项目。
关键词
基岩山区
大地电磁法
TE模式
TM模式
bedrock mountainous area
magnetotelluric method
TE mode
TM mode
