Geothermal Geological Characteristics And Resource Potential Evaluation Of Yongdeng Heqiao Area Of Gansu Pronvince

With the development of social economy and the increasing awareness of environmental protection,traditional energy sources are not only non-renewable,but also cause haze,environmental pollution and other issues.More serious,it will also cause global climate problems such as greenhouse effect and climate warming.Geothermal resources,as a stable,easy-to-develop and sustainable clean energy,have brought a turning point to the world's energy supply and demand and environmental crisis,which has attracted more and more attention of the whole society.On the basis of fully collecting and sorting out the previous geothermal geological data in the study area,this paper obtains the Geothermal Geological characteristics and related parameters of the study area by means of field investigation,remote sensing interpretation,comprehensive geophysical exploration,drilling and isotope analysis.The geothermal geological conditions and geothermal resource potential of the Yongdeng Heqiao area were evaluated.The results show that Yongdengheqiao area is located in the high geothermal value area,and there are many geothermal anomalies in the area.Geothermal geological conditions in the area are complex,including zonal geothermal reservoirs,such as Yaoshuigou and Longwanggou hot springs,which are obviously controlled by faults,and layered geothermal reservoirs with verified water content,such as multiple geothermal wells.There are thick Mesozoic and Cenozoic strata in study area,of which Quaternary and Neogene with thickness of 900-1000m can be used as caprocks,Cretaceous Hekou group and Jurassic Xiangtang group with thickness of 1100-1900m are thermal reservoirs,the basement rock of the Changcheng group in the northwest of the study area is the groundwater recharge source.the NW-trending fault is the water-conducting heat conduction channel,forming a unique layered strip-like geothermal system..The conceptual model of the geothermal system in the study area is established by comprehensive analysis.It is composed of deep crustal heating,upward thermal conductivity of deep faults,upward thermal conductivity of low thermal conductivity strata,thermal insulation and accumulation of geothermal water,and upward or lateral recharge of shallow strata along the faults.The amount of geothermal resources in the study area is calculated to be 7.5831×10¹⁴kJ,which is equivalent to 2.591×10¹⁰t of standard coal and 2.107×10¹¹ degree of electric energy;The exploitable resources are 10.8498×10¹²kJ,which is equivalent to 3.707×10⁸t of standard coal and3.014×10⁹ degree of electric energy.The potential of regional geothermal resources is good.