大地电磁测深法在银川盆地地热资源调查评价中的应用

doi:10.11720/wtyht.2019.1361

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Abstract

As a kind of clean and continuous energy, geothermal resources will play an enormous role in the development of China’s economy. In this study, data processing and analysis included calculation of 2D skewness and electric strike of the MT profile, and NLCG 2D inversion was performed on TM data, which consisted of 51 measurement points from line L1 and line L2 in western area of Yinchuan Basin. The result shows that the western margin of the Yinchuan Basin can be divided into three layers from top to bottom:low-resistivity layer, relatively high-resistivity layer and low-resistivity layer. Combined with the known geothermal geological data, the authors hold that Hongliugou Formation of Neogene is the principal heat reservoir and exploitation bed, followed by Qingshuiying Formation of Palaeogene and Ganhegou Formation of Neogene. The result shows that using MT method can well delineate the range of deep geothermal reservoir in the Yinchuan Basin and that MT method is suitable for exploring buried geothermal resources in deep plain.

Key words： magnetotelluric sounding geothermal exploration two-dimensional inversion Yinchuan Basin

Received: 08 October 2018 Published: 15 August 2019

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Corresponding Authors: Bo-Wen XU E-mail: 15222699756@163.com

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	Articles by authors
	Huai-Liang ZHU
	Bo-Wen XU
	Zhi-Long LIU
	Feng SHI
	Yu-Qi XIN
	Xue-Gang CAO
	Guo-Qiang Cheng

Cite this article:

Huai-Liang ZHU,Bo-Wen XU,Zhi-Long LIU, et al. The application of magnetotelluric sounding to geothermal resources assessment in Yinchuan Basin[J]. Geophysical and Geochemical Exploration, 2019, 43(4): 718-725.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1361 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I4/718

Present-day structural framework of the Yinchuan basin

MT stations along the profil from L1 and L2 profiles

Two-dimensional deviation degree pseudo-section of L1 and L2 lines
a—L1 line Swift skewness;b—L1 line Bahr skewness; c—L2 line Swift skewness;d—L2 line Bahr skewness

Rose diagram showing analysis result of L1 , L2 lines electrical principal axes

Comparison of resistivity section and phase section before and after L1 profile inversion
a—measured apparent resistivity;b—predicted resistivity;c—measured impedance phase;d—predicted impedance phase.

Two-dimensional inversion electrical structure model of MT data for L1(a) , L2(b) 〗lines

Inversion of resistivity Section and its Geological interpretation by L1 (a), L2 (b) lines

Stratigraphic system and main lithological distribution revealed by Well NSR-3

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