汝城盆地深部构造及地热资源赋存潜力——基于重力与AMT探测的认识

doi:10.11720/wtyht.2023.1449

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Abstract

Geothermal resources are significant clean energy and tourism mineral resources. The Rucheng Basin, a carbonate basin in the southeastern mountainous area of Hunan Province, possesses favorable conditions for the formation of convective geothermal energy. However, the basin is enclosed on three sides by the giant Zhuguangshan rock mass, and its basement is subjected to the intrusion and destruction by the rock mass, resulting in severely deformed formations, crisscrossing faults, and significantly different eastern and western structures. The understanding of the basin's water- and heat-conducting pathways and deep reservoir structures remains elusive, thus restricting the investigation of the basin's geothermal potential. Hence, this study probed the basin's deep structures through gravity survey and audio magnetotellurics (AMT), obtaining the following insights: (1) The Rucheng Basin has developed into a bidirectional ramp structure due to east-west differentiation. The synclinorium in the east experienced compression and clockwise rotation due to the emplacement of the Yanshanian rock mass, rocks were fragmented in the core zone, and strike-slip fracture zones were found at the boundary. The faults have vertical cutting depths exceeding 4 km, widths ranging from 300~600 m, and dip angles between 80°~90°. (2) The basin's basement anticlinal axis hosts several NWW-directed concealed rock masses, with diameters from 3~4 km and buried depths from 0.5~1.5 km. Hot springs reside in the fracture zones crossing the boundaries of the concealed rock masses. (3) The basin boasts favorable conditions for the formation of convective geothermal energy. Folds, fault zones, and concealed rock masses match each other to form a unified spatial combination of heat-controlling elements, manifesting heat accumulation characterized by east-west recharge and intermediate discharge. With more thriving deep geothermal reservoirs in the east, the basin has high potential for geothermal resources.

Key words： Rucheng Basin deep structure geothermal resource gravity survey and AMT

Received: 15 September 2022 Published: 27 October 2023

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	Articles by authors
	Bao-Feng ZHAO
	Qi-Nian WANG
	Xin GUO
	Da-Wei GUAN
	Tong-Gang CHEN
	Wen FANG

Cite this article:

Bao-Feng ZHAO,Qi-Nian WANG,Xin GUO, et al. Gravity survey and audio magnetotellurics-based insights into the deep structures and geothermal resource potential of the Rucheng Basin[J]. Geophysical and Geochemical Exploration, 2023, 47(5): 1147-1156.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1449 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I5/1147

Geological map of the work area

Rock physical properties of Rucheng Basin

Gravity anomaly and geological interpretation
a—Bouguer gravity;b—visual depth of matched filtering 0~2 000 m;c—visual depth of matched filtering 2 000~4 000 m;d—visual depth of matched filtering >4 000 m

AMT 2D inversion resistivity profile and geological interpretation
a—measuring and geological interpretation of L140; b—measuring and geological interpretation of L120; c—measuring and geological interpretation of L104

Topographic map of the work area

The deep structure and the geothermal conditions of Rucheng Basin

Geothermal occurrence mode of Rucheng basin

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