Application of comprehensive geophysical exploration in geothermal resources on the eastern margin of Yinchuan Basin
HU Xin-Jun1,2(), CHEN Xiao-Jing1(), WU Yang1, AN Bai-Zhou1, NI Ping1
1. Geophysical and Geochemical Exploration Institute of the Ningxia Hui Autonomous Region, Yinchuan 750001,China 2. School of Earth Resources China University of Geosciences (Wuhan),Wuhan 430074,China
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.
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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.
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