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.
虎新军, 陈晓晶, 仵阳, 安百州, 倪萍. 综合地球物理技术在银川盆地东缘地热研究中的应用[J]. 物探与化探, 2022, 46(4): 845-853.
HU Xin-Jun, CHEN Xiao-Jing, WU Yang, AN Bai-Zhou, NI Ping. Application of comprehensive geophysical exploration in geothermal resources on the eastern margin of Yinchuan Basin. Geophysical and Geochemical Exploration, 2022, 46(4): 845-853.
Gao L, Chen H B, Li X B, et al. Application of comprehensive electromagnetic method in geothermal exploration of Yinchuan Basin[J]. Journal of Shandong University of Technology:Natural Science Edition, 2013, 27(3):62-66.
Cao X G, Cheng G Q, Li L L. Application of MT in the investigation and evaluation of geothermal resources on the east bank of the Yellow River in Yinchuan Plain[J]. West-China Exploration Engineering, 2021(1):141-144.
Zuo L Q, Wang C H, Jin H, et al. The application of comprehensive geophysical prospecting method to geothermal prospecting in Xiaoyangkou of Nantong City in Jiangsu[J]. Chinese Journal of Engineering Geophysics, 2016, 13(1):122-129.
Liu B J, Feng S Y, Ji J F, et al. Lithospheric structure and faulting characteristics of the Helan Mountains and Yinchuan basin: Results of deep seismic reflection profiling[J]. Science China:Earth Sciences, 2017, 47(2):179-190.
徐世光, 郭远生. 地热学基础[M]. 北京: 科学出版社, 2009.
Xu S G, Guo Y S. Fundamentals of Geothermal[M]. Beijing: Science Press, 2009.