河北雄县地热田钻井地温测量及地温场特征

Borehole temperature logging and temperature field in the Xiongxian geothermal field,Hebei Province

根据研究区22口井的实测井温资料及前人的研究成果,开展了雄县地区地温场分析,对雄县地热田地温场的特点取得了以下认识:雄县地热田的盖层以传导热传递方式为主,热储层中源于供暖期热水生产和回灌引起的地下水受迫对流的影响,以对流热传递为主;不同静井时间的重复测温结果显示,静井时间的长短和井内流体的运移方式(抽水或回灌)控制了井内温度的分布及井内温度的动态变化:静井时间增加则测得的温度在中性点上下呈反向变化;生产井和回灌井的测温曲线存在明显不同;雄县热田第四系底部的温度为32.8 qc^48℃,容城凸起为28℃~35℃;雄县热田第三系底部温度为64.5℃~81.3℃,容城凸起为45℃~60℃。雄县地热田盖层内的地温梯度为43.9~72.2℃/km之间,平均为51℃/km;容城凸起的井地温梯度为31.4~41.1℃/km,平均为37.1℃/km。雄县地热田内盖层导热流值变化为80.61~113.86 mW/m^2的范围。

Based on the newly measured borehole temperature logs from 22 wells and other researchers＇ data, we analyze geothermal field features in Xiongxian, and find that the transfer model is mainly conductive in the cap rock, but the thermal reservoir is mainly convective due to the forced convection resulted by geothermal production and recharge. Several borehole temperature measurements show that the length of well static time and the migration patterns in well control the temperature distribution and the dynamic changes in the borehole： with more time to keep well static, the temperature data inversely changes in the neutral point. The temperature profile is different between the production and the recharge wells. The temperature of Quaternary bottom in Xiongxian geothermal field is 32.8 ℃ - 48 ℃ , and the Rongcheng uplift is 28 ℃ -35 ℃. The temperature of Tertiary bottom in Xiongxian geothermal field is 64.5℃ -81.29 ℃ , and the Rongcheng uplift is 45 ℃- 60 ℃. The geothermal gradient of cap rock in Xiongxian geothermal field is between 43.9 ℃/km and 72.2 ℃/km, the average value is 51 ℃/km. The Rongcheng uplift is between 31.4 ℃/km and 41. 1 ℃/km, the average value is 37.1 ℃/km. The geothermal flow in Xiongxian geothermal field is between 80.61 mW/m2 and 113.86 mW/m2. It is the highest geothermal flow in Jizhong depression.