• ISSN 2097-1893
  • CN 10-1855/P

基于导纳张量的航空大地电磁测量技术及应用

Airborne magnetotelluric measurement technology and application based on admittance tensor

  • 摘要: 航空大地电磁法是一种测量天然电磁场的机载频率域电磁法,它具有探测深度大、测量效率高、受地形影响小、绿色环保等优点. 本文简要介绍了航空大地电磁法的发展历史及其测量原理,在此基础上介绍了导纳张量的基本概念以及利用导纳张量进行航空大地电磁测量的工作方法,最后将其应用于复杂地形条件下的工程勘察中,结合反演电阻率和磁化率特征,实现了对岩体、断裂构造的有效探测. 应用实例表明基于导纳张量的航空大地电磁法对地电边界敏感,可用于复杂环境区近地表和深层结构的探测.

     

    Abstract: Airborne magnetotelluric method is an airborne frequency-domain electromagnetic method that measures the natural electromagnetic fields. It has the advantages of great detection depth, high measurement efficiency, minimal terrain influence, and being environmentally friendly. This paper briefly introduced the development history and measurement principles of airborne magnetotelluric method. Then introduced the basic concept of admittance tensor and the working methods of airborne magnetotelluric measurement using admittance tensor. Finally, this method was applied to engineering surveys under complex terrain conditions. By analyzing the characteristics of inversion resistivity and magnetic susceptibility, effective detection of rock masses and fracture structures was achieved. Application example showed that the airborne magnetotelluric method based on the admittance tensor is sensitive to geoelectric boundary and can be used for detecting near-surface and deep structures in complex environmental areas.

     

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