Modelling of Magnetotelluric Responses of 2-D Electrical Anomalous Body in Anisotropic Media Using Finite Element Method

XIONG Bin; LUO Tianya; LI Changwei; WANG Youxue; ZHANG Zhi; QIN Xiaofeng; DING Yanli

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Modelling of Magnetotelluric Responses of 2-D Electrical Anomalous Body in Anisotropic Media Using Finite Element Method

更新时间：2023-12-11

- Modelling of Magnetotelluric Responses of 2-D Electrical Anomalous Body in Anisotropic Media Using Finite Element Method
- Acta Scientiarum Naturalium Universitatis SunYatseni Vol. 52, Issue 4, Pages: 143-148(2013)
- 作者机构：
  
  桂林理工大学地球科学学院,广西,桂林,541004
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2013，
  
  Published Online：25 July 2013，
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XIONG Bin, LUO Tianya, LI Changwei, et al. Modelling of Magnetotelluric Responses of 2-D Electrical Anomalous Body in Anisotropic Media Using Finite Element Method. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 52(4):143-148(2013)
DOI：

XIONG Bin, LUO Tianya, LI Changwei, et al. Modelling of Magnetotelluric Responses of 2-D Electrical Anomalous Body in Anisotropic Media Using Finite Element Method. [J]. Acta Scientiarum Naturalium Universitatis SunYatseni 52(4):143-148(2013) DOI：

摘要

为了研究电导率各向异性介质中二维大电磁场的变化规律，首先从其满足的变分问题出发，利用有限单元法计算出大地电磁场，借助辅助场获得视电阻率，其次讨论TE

模式下各向异性介质和各向同性介质中视电阻率响应曲线的区别，接着探讨不同层面倾角、不同频率下各向异性异常体引起大地电磁场的变化，另外就高、低阻各向异性介质对大地电磁视电阻率影响的差异进行讨论，最后讨论平行层面和垂直层面的电阻率对各向异性介质平均电阻率的影响，从而获得各向异性大地电磁场响应特征。

Abstract

The variations of 2-D MT field in anisotropic medium for conductivity were studied in this paper. The electromagnetic field was worked out with finite element method(FEM)

and the apparent resistivity was obtained with the help of auxiliary field after variational problems in an anisotropic medium were solved. The differences of magnetotelluric field between anisotropic and isotropic media under TE

mode were discussed. Furthermore

the influence of dipping anisotropy and varying frequency was analyzed on the change of MT field. Finally

the characteristics of MT field response in the anisotropic media were obtained after discussing the effects of high resistance and low resistance on MT field and the impact of resistivity parallel to and perpendicular to the strike of structure.

关键词

有限单元法大地电磁各向异性介质正演

Keywords

FEMmagnetotelluricsanisotropy mediumforward modeling

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