Study On The Evaluation And Exploitation Of Geothermal Resources In Changbai Mountain Basalt Area

The development of geothermal resources can not only reduce the environmental pollution,but also promote the development of local economy.There are abundant geothermal resources in Changbai Mountain basalt area.Geothermal resources have excellent economic benefits.From the experience of developing and utilizing geothermal resources,unreasonable development and utilization will result in waste of geothermal resources and environmental geological problems.In order to prevent geothermal resources is wasted during the development and utilization of geothermal resources,and the best economic benefits have not been achieved.So the evaluation of geothermal resources and recoverable resources,the study of reasonable development mode of geothermal resources has very important practical guiding significance for the sustainable development of economy,energy planning,energy structure adjustment and environmental protection.This paper takes the Changbai Mountain basalt area as the research object.On the basis of collecting geological and hydrogeological data,we studied the evaluation and utilization of geothermal water in Changbai Mountain basalt area,and achieved the following results.?1?The geothermal field is analyzed,and the geothermal fields are divided into volcanic magmatic,fractured structure and stratified basin type;2M and 3M depth geotemperature in the study area are analyzed.The results show that there are Changbai Mountain volcano group,Shibadaogou and the Xianrenqiao geothermal zone;the geothermal water chemical composition of the study area is stable and the hydrochemical type has not changed.?2?According to the calculation results of thermal storage method,the total amount of geothermal resources area is 7.56×10¹⁹J,the recoverable amount is 5.84×10¹⁸J,and the reduced coal amount is 3.33×10¹¹t in the study.Geothermal resources are mainly concentrated in the geothermal fields of the Changbai Mountain volcano group and the Shibadaogou geothermal fields,respectively accounting for42%and 36%of the total resources.The exploitation of hot water in geothermal field is estimated,in which the Changbai Mountain volcano geothermal field is 1399m³/d,the Xianrenqiao geothermal field is 864m³/d,the Shibadaogou geothermal field is1737.2m³/d,the Laosandui geothermal field is 1344m³/d,and the Donggang geothermal field is 100.38 m³/d.?3?The evaluation of hot water and mineral water for geothermal water in the study area is carried out.In addition to the Laosandui geothermal field,the geothermal water of other geothermal fields has reached the standard of physiotherapy hot mineral water;The evaluation results of fishery water and Irrigation water for farmland quality show that there are harmful components exceeding the standard in the geothermal water in the study area.?3?Water quality evaluation results shows that Donggang geothermal RJ1 well has long slight corrosion,RJ2 well with medium corrosive and other geothermal water are not corrosive.The results of decomposition of erosion and crystalline erosion evaluation show that only Donggang geothermal field RJ2 well with crystalline erosion.Results of geothermal fluid fouling evaluation show that Changbai Mountain volcano group is the multi scale pan geothermal water,Shibadaogou,Xianrenqiao,Laosandui to scale water belongs to little pot of geothermal water,Donggang geothermal field,RJ1 well is a lot of hot water boiler scale,RJ2 well belonging to the scale of hot water.?4?Taking available geothermal resources,thermal storage depth,thermal reservoir thickness,reservoir temperature and regional location conditions as evaluation index use fuzzy mathematics method to evaluate the potential of geothermal field.The evaluation results show that the Laosandui and Donggang geothermal field belong to the combination of exploration and mining area,Xianrenqiao geothermal field belongs to the favorable development zone,Shibadaogou geothermal field and Changbai Mountain volcano group geothermal field belongs to the most favorable development zone.The TOPSIS evaluation method is used to evaluate the priority mining sequence of geothermal resources in the study area,The evaluation results show that Changbai Mountain volcano geothermal field>Xianrenqiao geothermal field>Laosandui geothermal field>eighteen geothermal field>Donggang geothermal field.?5?The evaluation of hot water and mineral water for geothermal water in the study area is carried out.In addition to the Laosandui geothermal field,the geothermal water of other geothermal fields has reached the standard of physiotherapy hot mineral water;The evaluation results of fishery water and Irrigation water for farmland quality show that there are harmful components exceeding the standard in the geothermal water in the study area.According to the development and utilization of hot fields,the geothermal field is divided into protection type and development type.The Xianrenqiao geothermal field belongs to the protection type,and other geothermal fields belong to the development and utilization type.The cascade development model of geothermal resources is studied,and the results show that Changbai Mountain volcano group geothermal field is suitable for the development of geothermal Tourism;Shibadaogou geothermal field is suitable for agricultural cultivation-aquaculture development model,spa recuperation-aquaculture development model;The Laosandui geothermal field is suitable for agricultural cultivation-aquaculture development model,spa recuperation-aquaculture development model;Donggang geothermal fields is suitable for agricultural planting-aquaculture development mode and Spa-aquaculture development mode.