Evaluation of recoverable geothermal resources and development parameters of Mesoproterozoic thermal reservoir with the top surface depth of 3500 m and shallow in Xiong’an New Area
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    Abstract:

    In order to scientifically and rationally develop and utilize the Mesoproterozoic geothermal energy with the top surface depth of 3500m and shallow in Xiong’an New Area, the parameters recoverable amount of geothermal resources are evaluated using recovery rate of geothermal resources, well layout scale, single well production, national permissible index of hydrothermal decline, recharging- discharging well spacing, recharge quantity and production time. The results show that the recovery rate of geotherma l resources and well distribution scale are limited. At present, the Wumishan Formation has the main single well production of 110 m3/h, recharge quantity of 165 m3/h and well spacing of 500 m, all of which can meet the 100- year development life of geothermal field and meet the national permissible index of water and heat decline. The theoretical maximum thermal energy recovery of geothermal unit is related to physical properties, such as porosity, density, specific heat of the rock and density, specific heat of geothermal water in single- layer thermal reservoir, but not to the area and thickness of thermal reservoirs. The actual maximum thermal energy recovery rate is only about half of the theoretical maximum recovery, and it is directly related to the development parameters such as production well layout scale, single well production, development time and tail water temperature. The simplified formulas for evaluating the development parameters of recharging- discharging well spacing, recharge quantity and production time are much practical and easily used. In the evaluation of thermal breakthrough distance, time and recharge quantity, the effective thickness of thermal reservoir, regardless of lithology, is a very important factor, followed by recharge quantity and recharge time. Porosity and permeability impose much less influence than effective thickness. The optimistic estimation of recoverable geothermal water resources in the Xiong’an New Area accounts for 50% of the total storage hot water, i. e. 163. 79×108 m3, 37. 76×108 GJ and 2. 579×108 t of standard coal, which can meet the annual heating requirement of 113. 7 million square meters of buildings with energy consumption is 0. 32 GJ per square meter and per year. The conservative estimation takes 30% of the optimistic result; the best estimation is 50% of the optimistic estimation result and the current annual geothermal water resources can meet the demand of 56. 85 million square meters for building heating. Therefore, the Xiong’an New Area will be a typical demonstration area for geothermal energy application.

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DAI Minggang, LEI Haifei, HU Jiaguo, GUO Xinfeng, MA Pengpeng, ZHANG Jiayun.2019. Evaluation of recoverable geothermal resources and development parameters of Mesoproterozoic thermal reservoir with the top surface depth of 3500 m and shallow in Xiong’an New Area[J]. Acta Geologica Sinica,93(11):2874-2888

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History
  • Received:May 24,2019
  • Revised:August 30,2019
  • Adopted:September 01,2019
  • Online: September 28,2019
  • Published: