In order to find out the characteristics and reserves of geothermal water resources in Chenzhou City,two typical geothermal fields in the Xujiadong area were selected,and their geological conditions,char-acteristics of geothermal fluid field,and hydro-chemical types of geothermal water were also investigated by means of geothermal geological survey and water quality test.Based on the above research,an analysis and evaluation of geothermal resource reserves in this study area was conducted.The results show that:(1)The geothermal water is controlled by fault structure and is formed by the infiltrated groundwater absorbing heat energy from buried rock mass during deep circulation along fault structure.(2)The main hydro-chemical types are HCO3-Ca type,HCO3-Ca·Na type or HCO3·SO4-Ca·Mg type,and the geothermal water is low-tempera-ture,colorless and transparent weakly alkaline water.(3)The main supply source of geothermal water is atmo-spheric precipitation.After water infiltration,it migrated to a certain depth along the developed NE fault struc-ture(F24,F7,F25,F8),and during this process,it absorbed heat energy and gradually warms to form hot water.Afterwards it migrated upwards along the unevenly developed karst fissure system at faults intersection,and finally emerged on the surface as hot springs.(4)The geothermal water can provide about 3.23×108 MJ of thermal energy annually in this research area,which can save about 1.18×104 t of standard coal resources per year.The research results are important for guiding the rational development and utilization of geothermal re-sources in Chenzhou City.
关键词
地下热水/流场特征/水化学特征/地热资源量计算/地热资源评价
Key words
geothermal water/flow field characteristics/water chemical characteristics/calculation of geo-thermal resources/evaluation of geothermal resources
维普
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