天水市街亭温泉地热资源勘探与开发利用OA

This study aims to investigate the origin,thermal storage burial conditions and occurrence characteristics of fissure geothermal water at Jieting Hot Springs of Maiji District in Tianshui city,Gansu Province,define the extent of geothermal field and assess the exploitable resource volume,therefore provide a scientific basis for the rational development and environmental protection of geothermal resources in this area.By comprehensively applying methods such as hydrochemical analysis,isotope tracing,hydrogeological parameter calculation and geothermal resource reserve evaluation,study confirms that the geothermal water is of bicarbonate-sodium type,with a pH of 9.09 and a total mineralization of 0.304 g/L.It is rich in beneficial trace elements such as strontium,zinc,bromine,iodine and selenium,and its fluoride content meets the standards for medical thermal mineral water,indicating significant therapeutic value.Isotope analysis reveals that the water source is primarily recharged by precipitation,with a reservoir is identified as the Qinling group gneiss,with a thickness of 227 m and a temperature of 79.04℃.The geothermal field covers an area of 0.558 km2,with a total heat storage capacity of 2.02×1016 J and an exploitable heat capacity of 2.02×1015 J.The annual exploitable volume of geothermal fluid is 4.53×105 m3,equivalent to a thermal power of 2.25 MW.The findings indicate promising prospects for the development of this geothermal resource,applicable in areas such as physiotherapy and bathing,tourism development,eco-sightseeing and geothermal agriculture.The results not only support the optimization of regional energy structure,economic development,and environmental protection,but also contribute to achieving the strategic goals of"carbon peak and carbon neutrality".