基于时序参数分析的砂岩热储回灌特征变化研究——以山东临清市为例

为促进山东省临清市地热资源循环利用，开展了地热水回灌工程。针对采暖期前与采暖期两种情形的回灌情况，监测了开采井及回灌井的水量、水温、水位及井口压力等，并基于时序参数分析了回灌能力及最大回灌量、开采井温度场、水质变化和回灌堵塞程度。结果表明：本次施工的回灌井能够满足单井100%回灌，单井自然回灌量可达121～227 m3/h；总体上开采井地热水温度表现为在供暖期上升、供暖末期下降的趋势；由于井位深度差别，在供暖期前后，开采井矿化度比回灌井分别高约45.34%和17.33%；经过一个供暖季的回灌，虽然在回扬过程中渗透系数有一定的改善，但仍由0.7699 m/s降至0.3254 m/s，有明显变小的趋势。

Research on the changes of sandstone thermal storage recharge characteristics based on time series parameter 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.