综合地球物理技术在银川盆地东缘地热研究中的应用

doi:10.11720/wtyht.2022.1409

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Abstract

A geothermal field has been discovered in the Tianshan Sea World on the eastern margin of the Yinchuan Basin, revealing that the region has high-quality geothermal resources. The geological conditions for the formation of the geothermal field are significantly different from those of the conduction-type geothermal resources within basins, providing a new direction for the study of clean energy in the Yellow River Basin in Ningxia. This study processes and analyzes the data of 1∶50,000-scaled gravity surveys, controlled source audio-frequency magnetotellurics (CSAMT), and microtremor survey based on regional geological and geophysical characteristics. The results of the study are as follows. The uplifting zone of the Ordovician basement lies on the east side of the Lingwu Sag and spreads in an "S" shape along the Yellow River Fault. This zone reaches its highest part in the Tianshan Sea World, where it merges with the NW-trending local uplift. The Ordovician of the deep reservoirs in the geothermal field is characterized by medium-high resistance. The Carboniferous-Permian of the first cap rock at a moderate depth shows medium-low resistance and low seismic velocity. The Paleogene-Neogene of the second shallow cap rock corresponds to the formation with low resistance and low seismic velocity. Using these results, three prospective areas for developing and utilization of geothermal resources have been predicted.

Key words： geothermal resources comprehensive geophysical exploration basement structure reservoir-cap rock assemblage eastern margin of Yinchuan Basin

Received: 26 July 2021 Published: 17 August 2022

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P631

Corresponding Authors: CHEN Xiao-Jing E-mail: junyan_home@126.com;825785150@qq.com

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	Xin-Jun HU
	Xiao-Jing CHEN
	Yang WU
	Bai-Zhou AN
	Ping NI

Cite this article:

Xin-Jun HU,Xiao-Jing CHEN,Yang WU, et al. Application of comprehensive geophysical exploration in geothermal resources on the eastern margin of Yinchuan Basin[J]. Geophysical and Geochemical Exploration, 2022, 46(4): 845-853.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1409 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I4/845

Geological structure map of Yinchuan Basin
1—Quaternary;2—Neogene;3—Paleogene;4—Cretaceous;5—Jurassic;6—Triassic;7—Permian;8—Carboniferous;9—Devonian;10—Ordovician;11—Caimbrian;12—Proterzoic;13—Tonalite;14—Biotite granite;15—geological boundary;16—inferred geological boundary;17—unconformity boundary;18—lithofacies boundary;19—important fault;20—concealed fault;21—exposed fault

Residual gravity anomaly map
Aeromagnetic anomaly map
1—high gravity anomaly;2—low gravity anomaly;3—fault
1—high aeromagnetic anomaly;2—low aeromagnetic anomaly;3—fault

Comparison of stratum temperrature in Yinchuan Basin and eastern margin area

DRT-03 borehole geothermal gradient

Correspondence analysis of DRT-03 borehole gravity(a) and magnetic anomalies(b)

Depth comparison of Ordvician top surface

Inversion of Paleozoic basement depth map by Park method density inetrface

Electrical characteristic diagram of WL-01 section

Interpretation of S-wave velocity profile in DRT-03 well area by micro-motion inversion

Geothermal prospective prediction area in the southern part of the eastern margin of Yinchuan Basin

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