| Citation: |
LIU Runchuan, REN Zhanli, YE Hanqing, REN Wenbo, WANG Kun, HUAI Yinchao, QI Kai. Potential evaluation of geothermal resources: exemplifying some municipalities and key strata in Ordos Basin as a study case[J]. Geological Bulletin of China, 2021, 40(4): 565-576.
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Potential evaluation of geothermal resources: exemplifying some municipalities and key strata in Ordos Basin as a study case
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Abstract
There exists debate in the geothermal field of Ordos Basin, including ambiguous understanding of geothermal resources reserves, nubilous development mode of shallow geothermal energy and difference in the delimitation of favorable horizon and prospects.Different evaluation methods were used to evaluate the potential and prospect of hydrothermal geothermal resources, shallow geothermal energy and dry hot rock geothermal resources in Ordos Basin.Combined with the development mode and benefit of geothermal resources, the geothermal resources in Ordos Basin was comprehensively analyzed.The analysis results show that Ordos Basin is relatively rich geothermal resources.The geothermal resources of hydrothermal type is equivalent to 24.94 billion tons of standard coal.The annual exploitable amount of geothermal resources is equivalent to 7.481 million tons of standard coal.The annual recoverable amount of shallow geothermal energy resources in 7 cities above prefecture level is equivalent to 2.812 million tons of standard coal, and the potential resources of dry hot rock are equivalent to 16.63 trillion tons of standard coal.The favorable areas of geothermal resource in the basin are mainly distributed in Yulin City -Hengshan County-Jingbian County and Zichang County Ansai County Yan'an City.At present, the development of 0~200 m shallow geothermal energy in Ordos Basin is mainly based on ground source heat pump, supplemented by ground water source heat pump.The development of 200~6000 m deep geothermal resource is mainly by the way of deep buried pipe heat exchange and the combination of mining and irrigation.Because of the obvious effect of geothermal energy development, energy conservation and emission reduction, it is worth promoting vigorously.
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References
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LIU Runchuan, REN Zhanli, YE Hanqing, REN Wenbo, WANG Kun, HUAI Yinchao, QI Kai. Potential evaluation of geothermal resources: exemplifying some municipalities and key strata in Ordos Basin as a study case[J]. Geological Bulletin of China, 2021, 40(4): 565-576.
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Figure 1.
Prediction ofgeothermal resource prospects in Ordos Basin
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Figure 2.
Vertical buried pipe closed system(a) and horizontal buried pipe closed system(b)
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Figure 3.
Schematic diagram of mining and irrigation well combined with heating technology
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Figure 4.
Deep buried pipe heat exchange system
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Figure 5.
U-type horizontal opposed nozzle heat extraction system
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Figure 6.
Schematic diagram of geothermal cascading development combined with mining and irrigation