基于土壤氡气测量和可控源音频大地电磁的陕西眉县汤峪地热预测

doi:10.11720/wtyht.2023.0010

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Abstract

Despite abundant geothermal reserves of the Tangyu geothermal field in Meixian County, Shaanxi Province, long-term exploitation has decreased the water temperatures and yields of its existing geothermal wells year by year. Hence, there is an urgent need to explore new potential geothermal resources in the geothermal field. Since the known geothermal wells in the geothermal field are significantly controlled by faults, investigating the deep fault propagation holds critical significance for exploring the geothermal field’s potential geothermal resources. Due to the method limitations and the topographic influence, identifying thermal control faults through conventional geological route investigation or large-scale engineering is not applicable to the geothermal field. Therefore, a new technical method combining the penetrating soil radon measurement and the controlled source audio magnetotelluric (CSAMT) method was employed in this study to find concealed faults and delineate potential geothermal areas. Based on the measured surface soil radon concentration anomaly data and the subsurface electrical structure model derived from the CSAMT data inversion, this study inferred six new concealed faults on the basis of corroborating the known faults, predicted two potential geothermal areas, and built a conceptual model for the Tangyu geothermal field. As revealed by the results, the soil radon concentrations at concealed faults are much higher than the regional background value, and the concealed faults are located in the low-resistivity fracture zones as indicated by the apparent resistivity results based on CSAMT data inversion. Besides, the two potential geothermal areas spread from 450~750 m and 850~1 150 m on the profile, respectively, at depths of approximately 250~300 m. This study concludes that the geothermal field resides in a low-resistivity region with soil radon anomalies three times the regional background value. The results of this study provide a reference for the subsequent sustainable production and utilization of potential geothermal resources in the region.

Key words： soil radon measurement CSAMT concealed fault geothermal resource Tangyu

Received: 03 January 2023 Published: 27 October 2023

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Corresponding Authors: LIU Cheng E-mail: 18645810303@163.com;liuchenghj@163.com

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	Dong-Xu XUE
	Cheng LIU
	Fa GUO
	Jun WANG
	Duo-Xun XU
	Sheng-Fei YANG
	Pei ZHANG

Cite this article:

Dong-Xu XUE,Cheng LIU,Fa GUO, et al. Predicting the geothermal resources of the Tangyu geothermal field in Meixian County, Shaanxi Province, based on soil radon measurement and the controlled source audio magnetotelluric method[J]. Geophysical and Geochemical Exploration, 2023, 47(5): 1169-1178.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.0010 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I5/1169

3,20] )
1—the Quaternary Holocene; 2—the upper Pleistocene of the Quaternary system; 3—plagioclase amphibolite gneiss; 4—mixed lithic gneiss; 5—ylonitic granite; 6—gneiss granite; 7—stratigraphic boundary; 8—fracture structure; 9—geothermal wells; 10—river system; 11—road; 12—research area
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Geotectonic location map of the study area (a) and geological sketch (b) (modified from literature [3,20] )
1—the Quaternary Holocene; 2—the upper Pleistocene of the Quaternary system; 3—plagioclase amphibolite gneiss; 4—mixed lithic gneiss; 5—ylonitic granite; 6—gneiss granite; 7—stratigraphic boundary; 8—fracture structure; 9—geothermal wells; 10—river system; 11—road; 12—research area

Detection result of radioactivity index of Tangyu geothermal hot spring in Mei County

Statistics of stratum physical characteristics in the study area^[32]

Planar diagram of scalar CSAMT measuring device

Plan view of soil radon concentration in the study area

Joint profile comprehensive Ⅰ interpretation inference map

Apparent resistivity and impedance phase curves of typical measuring points

Conceptual model of Tangyu geothermal field in Mei County

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