基于反函数原理的可控源大地电磁法全场域视电阻率定义  

Definition of full-field apparent resistivity of controlled source magnetotellurics based on inverse function principle

作　　者：秦西社 马劼 郭文波 戚志鹏 曹华科[2,3] QIN Xi-She;MA Jie;GUO Wen-Bo;QI Zhi-Peng;CAO Hua-Ke(Northwest Nonferrous Metals Mining and Geological Exploration Group Co.,Ltd.for Nonferrous Metals,Xi'an 710051,China;College of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,China;Integrated Geophysical Simulation Lab(Key Laboratory of Chinese Geophysics Society),Xi'an 710054,China;Xi'an Geophysical and Geochemical Exploration Corporation,Bureau of Geological Exploration for Nonferrous Metals in Northwest China,Xi'an 710068,China)

机构地区：[1]西北有色地矿集团,陕西西安710051 [2]长安大学地质工程与测绘学院,陕西西安710054 [3]中国地球物理学会地球物理场多参数综合模拟重点实验室,陕西西安710054 [4]西安西北有色物化探总队有限公司,陕西西安710068

出　　处：《物探与化探》2022年第2期373-382,共10页Geophysical and Geochemical Exploration

基　　金：国家自然科学基金项目(42074168);博士后基金项目(2017M620475)。

摘　　要：在电磁探测中,数据采集范围逐步扩大,为了避免非远区的电阻率畸变,基于反函数原理,给出了适合可控源电磁法全场域视电阻率的定义方法。该方法可以利用单分量进行广域视电阻计算,同样也可以利用多个分量进行广域视电阻计算。分别利用电场分量、磁场分量以及电场与磁场的比值计算均匀半空间与层状模型的全场域视电阻率,结果表明基于反函数原理的可控源大地电磁视电阻率定义方法能实现不受空间制约的频域视电阻率定义,可更好地反映地下介质电阻率的分布。With the development of the wide-field electromagnetic method,the scope of data collection has been gradually expanded.To avoid the none-far-field resistivity distortion,this paper proposes a definition method suitable for the full-field apparent resistivity of the controlled-source electromagnetic method based on the inverse function principle.With this method,the full-field apparent resistivity can be calculated using a single component or multiple components.The full-field apparent resistivity of a homogeneous half-space model and a layered model was calculated using individual components of electric and magnetic fields and their ratios.The results show that the definition method proposed in this paper can achieve the definition of frequency-domain apparent resistivity that is not limited by space and thus can better reflect the resistivity distribution of underground media.

关 键 词：可控源大地电磁法 视电阻率 反函数 全场域 

分 类 号：P631[天文地球—地质矿产勘探]