层状介质下张量CSAMT最小收发距研究

doi:10.11720/wtyht.2020.1168

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Abstract

According to the observation mode, Controlled Source Audio-frequency Magnetotelluric Method (CSAMT) can be divided into scalar CSAMT and tensor CSAMT. Due to the difference between the construction method and the resistivity calculation method, the minimum transmission and reception distance in the division of far-field of the scalar CSAMT cannot be accurately applied to the tensor CSAMT. According to the relative errors of tensor apparent resistivity and Magnetotelluric (MT) apparent resistivity, the relative errors of the homogeneous geodetic model and the two-layer model were calculated respectively, and the minimum transmission and reception distances under different error limits was accurately given. The results show that, for the two-layer model, when the thickness of the first layer is less than 3 times the skin depth, the result of homogeneous half space cannot be directly applied, which causes a large error for the G-type model. Multilayer results can be approximately evaluated from the two-layer model with equivalent resistivity . The research results in this paper have certain theoretical guiding significance for the tensor CSAMT field construction.

Key words： tensor CSAMT relative error minimum transmission and reception distances

Received: 27 March 2019 Published: 03 March 2020

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	Articles by authors
	Chao ZHANG
	Da-Lei CHEN
	Yang WANG
	Hong-Jun WANG

Cite this article:

Chao ZHANG,Da-Lei CHEN,Yang WANG, et al. Research on minimum transmit-receive distance of tensor CSAMT in layered media[J]. Geophysical and Geochemical Exploration, 2020, 44(1): 156-164.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1168 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I1/156

Plane distribution of relative error for apparent resistivity between scalar CSAMT and MT above uniform halfspace earth

Plane distribution of relative error for apparent resistivity between tensor CSAMT and MT above uniform halfspace earth

Effective observation area for tensor CSAMT

ρxyT in direction of 12.5°
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Relative error of $ρ xy T$ in direction of 12.5°

误差限	r_min
误差限	1%	3%	5%	10%
$ρ xy T$ 12.5°方向	7.5δ	5.1δ	5.0δ	4.7δ
$ρ yx T$ 12.5°方向	7.1δ	6.3δ	5.6δ	3.4δ

Minimum offset r required by different error limits for scalar CSAMT above uniform halfspace earth model

Plane distribution of relative error for apparent resistivity between tensor CSAMT and MT above G-type model

Plane distribution of relative error for apparent resistivity between tensor CSAMT and MT above D-type model

Distribution of error 1% in model space

Distribution of error 5% in model space

Distribution of error 10% in model space

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