关于频率电磁测深几个问题的探讨(一)——从可控源音频大地电磁测深原理看解释中的问题  

Problem of date interpretation from the view of principle of controlled-source audio-frequency magnetotellurics

作　　者：陈明生 

机构地区：[1]中煤科工集团西安研究院,陕西西安710077

出　　处：《煤田地质与勘探》2012年第5期63-66,共4页Coal Geology & Exploration

摘　　要：从频率电磁测深原理出发,说明了人工源频率测深的电磁场存在3个场区,也只有远区场的可控源音频大地电磁测深(CSAMT)法的资料才能用音频大地电磁测深(AMT)法进行反演解释。对于存在中近区的CSAMT法资料,可进行近场校正,然后按AMT法解释。由于近场校正是建立在均匀半空间模型之上,校正误差大。为此提出了不加校正直接对比值视电阻率数据进行反演解释,最好按电磁场单分量资料解释,以减少不必要的校正误差。The paper,from the principle of frequency souding,ilustrates that there are three field zones for frequency souding of artificil source,far-field data of controlled-source audio-frequency magnetotellurics（CSAMT） were interpreted by audio-frequency magnetotellurics（AMT）.After data in near-fied has ben corrected,it is interpreted by AMT.Because near-field conrrection is based on homogeneous half-space mode,so correction error is bigger.Therefor,it is presented that data of ratio apparent risistivity without correction or data of single component of electromagnetic field are directly interpreted by inversion.

关 键 词：音频大地电磁测深 可控源音频大地电磁测深 比值视电阻率 近场校正 电磁场单分量 

分 类 号：P631[天文地球—地质矿产勘探]