| Hong Hegu hot spring is located in the northeast of Maile City,Yunnan Province,near the town of Miyang.With the development of economy,the Maple Palace Hotellnvestment Management group has drilled three hot water wells under the condition of the original natural hot spring,all of which have high temperature and large flow,indicating that the hot water in the red river valley is characterized by moderate and low temperature hot water and has good potential for hot water development.This paper takes Hong Hegu hot spring of Maile as the main research object.By studying the local geological background,tectonic environment and hydrogeological conditions,combining with the hydrochemical test results and isotopic characteristics of different water samples,the author compares and analyzes the water-rock interatci-on of hot water,the source of water,the mixing degree of thermal reservoir and cold and hot water and summarizes the genetic mechanism of hot spring.By analyzing the hydrochemical characteristics of hot water and combining with the geological structur-e characteristics,we can judge whether the hot water drilling has an effect on the hot spring.The main results are as follows:(1)Through the analysis of the water chemical characteristics of hot spring and hot water drilling,it is concluded that hot spring belongs to the medium and low temperature hot water.The hot spring degree of mineralization is about 232-328mg/L,belongs to low mineralization water.The p H is about 6.2-6.9 which is slightly acidic.In the hot spring,the main anions are HCO3-,and the content of cations is Ca2+.The hot water belongs to HCO3-Ca type.The cold water belongs to HCO3-Ca-Mg type.The hot spring water in red river valley is rich in strontium and metasilicate acid,which has reached drinking mineral water standard and medical mineral water standard respectively,and is suitable for drinking and physiotherapy.According to the element proportionality coefficient,it is inferred that the hot water comes from the underground limestone layer.(2)According to isotope analysis,the hot spring water in red river valley is derived from meteoric precipitation,and the supply elevation is 2150 m.Radioisotopes indicate that the groundwater in the hot spring area of red river valley is young in age and that the groundwater circulation rate is fast.In the analysis of hot spring thermal storage,it is concluded that the heat storage temperature is calculated by using Si O2 temperature scale and cationic temperature scale,and the underground hot water is determined as immature water by combining with the na-k-mg triangle diagram method,the heat storage temperature is determined as 69?,and the hot spring has cold water mixed.The silicon-enthalpy model was used to determine the mixing amount of cold water in hot spring and drilling water.(3)The genetic model of hot springs can be summarized as follows: under the background of low regional geothermal in the geothermal anomaly area,precipitation in the alpine area penetrates deep underground circulation along the deep and large faults and fracture zones,and obtains heat in the deep limestone layer of the geothermal anomaly area.The geothermal water migrates to the favorable geological conditions,mixes with the shallow cold water in the rising process,and drains at the favorable topography and geological structure.The drilling depth reveals the location of the underground hot water aquifer and the depth of the thermal reservoir.Combined with the water flow direction in the area,there is a hydraulic connection between the hot spring and the drilling.The drilling has certain influence on the hot spring,but the influence is weak.The calculation of natural heat release and geothermal resources in hot spring shows that the hot spring geothermal resources in red river valley are abundant and have good development potential. |
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