Research on the Changes of Sandstone Thermal Storage Recharge Characteristics Based on Time Series Parameters Analysis:A Case Study of Linqing City in Shandong Province
In order to promote the circular utilization of geothermal resources in Linqing City of Shandong Province,a geothermal water recharge project has been carried out.The water volume,temperature,water level,and wellhead pressure of the extraction well and the recharge well were monitored based on the recharge situation before and during the heating period.Then,the recharge capacity and maximum recharge amount,temperature field of the extraction well,water quality changes,and degree of recharge blockage were analyzed based on time series parameters.The results show that the reinjection well constructed in this project can meet 100%reinjection of a single well,and the natural reinjection amount of a single well can reach 121～227m3/h.Overall,the temperature of geothermal water in mining wells shows an increasing trend during the heating period and a decreasing trend at the end of the heating period.Due to the difference in well depth,before and after the heating period,the mineralization degree of the extraction well is about 45.34%and 17.33%higher than that of the recharge well,respectively.After a heating season of recharge,although the permeability coefficient has improved to some extent during the rebound process,it still decreased from 0.7699 m/s to 0.3254 m/s,showing a clear trend of decreasing.
sandstone thermal storagetime series parametersgeothermal reinjectiongeothermal extraction characteristicsLinqing CityShandong Province
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