贵州卫城地热资源热储地质条件分析OACSTPCD

The geothermal resource in Weicheng has high temperature,large water volume,and is rich in trace elements such as strontium,lithium,fluorine,iron,barium,iodine and hemisilicic acid which is beneficial to humans.Base on the investigation of regional geological background,geological characteristics of the geothermal area,well temperature data,δD-δ18O relationship and Na-K-Mg relationship,the geological conditions of geo-thermal reservoir are analyzed.The source of geothermal water supply is mainly atmospheric precipitation,and it is deep cycle heating,with a cycle depth of 2 344.40 m and the thermal storage temperature of 74.06℃.At-mospheric precipitation seeps down along the structural fissures,heated by regional earth heat flow,resulting in changes in temperature and pressure,forming a circulating migration environment of underground cold and hot water.During the circulation,the water acts as a heat conduction medium,and absorbs mineral components in the surrounding rocks to form geothermal water rich in trace elements which are beneficial to humans.The struc-ture in this area has both thermal conductivity and water storage,and the fracture is connected with carbonate rock karst storage unit to form carbonate rock karst heat storage+banded heat storage environment.Since the mi-gration environment is not closed,the waterrock interaction is weak.