山东高青县沉积盆地型地热流体地球化学特征及成因探讨

Geochemical characteristics and genesis of sedimentary basin-type geothermal fluids in Gaoqing County,Shandong Province

高青县地热资源类型为沉积盆地型,主要热储层为古近系东营组孔隙-裂隙型砂岩热储,井口出水温度在53~76.8℃,水化学类型为Na-Cl型。地温场受构造控制影响,为传导型地热系统。根据水化学主要离子组分特征及相关关系、氢氧同位素特征研究,证实高青热田地热水水源为晚更新世大气降水补给,其成因类型为沉积水,且滞留时间较长,水岩作用强烈。

The geothermal resources in Gaoqing County are of sedimentary basin type.The main thermal reservoirs are pore-fissure sandstone reservoirs of the Paleogene Dongying Formation.The outlet water temperature of the wellhead ranges from 53 ℃ to 76.8 ℃,and the hydrochemical type is Na-Cl.The geothermal field is a conductive geothermal system affected by tectonic control.According to the characteristics of main ion components and their correlations,hydrogen and oxygen isotopes,it is confirmed that the source of geothermal water in Gaoqing hot field is recharged by late Pleistocene atmospheric precipitation,and its genetic type is sedimentary water,which has a long detention time and strong water-rock interaction.