测量磁场水平分量<i>H<sub>y</sub></i>的电性源广域电磁测深法

doi:10.11720/wtyht.2021.1150

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Abstract

Based on the formula system of the electromagnetic field of the horizontal electric dipole source on the layered earth surface, this paper proposes the wide field apparent resistivity of y-component magnetic field (H_y) using the modulus of impedance. The field components E_x, H_y, and H_z of the electromagnetic field with multiple source-receiver separations on the surface of layered geoelectric model are calculated. The wide field apparent resistivity with these three field components and E_x/H_y cagniard resistivity are calculated, and compared with the MT Cagniard resistivity spectrum curve of the model. It is suggested that the wide field apparent resistivity of H_y has a good response to the geoelectric model in the vast area of the equatorial array and the axial array of the horizontal electric dipole source, and it can be used for single component wide field electromagnetic sounding. The axial array wide field apparent resistivity of H_y is similar to that of the equatorial array wide field of the vertical magnetic field of H_z. In the low frequency band, the wide field apparent resistivity of H_y is similar to that of the Cagniard resistivity of the magnetotelluric sounding of the layered model. Under the condition of small source-receiver separation, the axial array wide field apparent resistivity of H_y can have a better response to the deep basement. The equatorial array and the axial array wide field apparent resistivity of the E_x component of the horizontal electric field will wholly enter "saturated area" in the low frequency band. For each resistivity definition method, the appropriate source-receiver separation is the premise to reflect the geoelectric characteristics better, and the multi source-receiver separation measurement is more conducive to reflecting the deep electrical characteristics.

Key words： horizontal current dipole source layered formation model wide field apparent resistivity of H_y component of magnetic field wide field apparent resistivity of H_z vertical component of magnetic field wide field apparent resistivity of E_x component of horizontal electric field

Received: 30 March 2020 Published: 01 March 2021

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	Wei-Bin LUO
	Zhi-Jun DING
	Shu-De GAO
	Xing ZHANG

Cite this article:

Wei-Bin LUO,Zhi-Jun DING,Shu-De GAO, et al. Wide field electromagnetic sounding using y-component magnetic field with horizontal current dipole source[J]. Geophysical and Geochemical Exploration, 2021, 45(1): 46-56.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1150 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I1/46

Layered geoelectricity model with horizontal electric dipole source

Two layers type geoelectricity model parameters

Whole zone apparent resistivity spectrum of two layers type geoelectricity model

H-type geoelectricity model parameters

Apparent resistivity spectrum of H-type geoelectricity model with different method

K-type geoelectricity model parameters

Apparent resistivity spectrum of K-type geoelectricity model with different T-R offset

HK-type geoelectricity model parameters

Comparison of frequency curves with different definitions of equatorial resistivity (distance between transceiver and transmitter is 7 000 m)

Whole zone apparent resistivity spectrum of HK-type geoelectricity model with multi T-R distance (frequency at 50.12 Hz)

KH-type geoelectricity model parameters

Whole zone apparent resistivity spectrum of KH-type geoelectricity model with multi transmit-receive distance

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