磁电法基本原理、发展现状及前景展望

Basic Principle,Current Status and Prospect of Magnetometric Resistivity

磁电法作为一类特点明显的电磁勘探方法在外国(美国、加拿大、澳大利亚等)已经有了成熟的应用,但是该类方法在我国应用研究较少,甚至不为众人所知。本文从数据采集与分析、正反演技术以及应用现状3个方面详细介绍了国内外磁电法的技术原理和发展现状;总结了磁电法的优缺点及适用的条件,对于我国未来磁电法的发展提出了建议。综述表明:1)目前地面数据采集为中梯方式,可以借鉴其他应用成熟的电磁法观测方式;2)磁电法从静电场理论出发无法得到绝对电导率,可以尝试频率域理论;3)地面数据的深度分辨能力需要提高,可以通过多源多分量三维反演来提高反演的准确性;4)建议在国内将磁电法的应用范围扩展到井中、海洋以及环境和工程领域。

As an effective and efficient electromagnetic method,magnetometric resistivity method has been extensively used worldwide;however,it is unfamiliar in China.Therefore,this paper tries to introduce the fundamentals of this technology on the three aspects,i.e.data collection and analysis,forward modeling,and inversion through case studies,in order to outline the potential development in China.In this review,we indicate that:1)most of the time,gradient array is used for surface MMR data collection,yet the survey layout in other electromagnetic method can be adapted;2)from view point of electrostatic theory,absolute conductivity cannot be obtained by the magnetometric resistivity method;however,if we collect data in frequency domain,the problem may be solved;3)deep resolution of surface MMR data need to be,and can be improved through multisource and multi-component3D inversion;4)in China,MMR could be extended to borehole exploration,marine exploration,and applied to the scope of environment,and engineering.