Evaluation And Exploitation Of Geothermal Resources In Karst Heat Reservoir Of Pingmei No.10 Mine

Geothermal energy is a clean,low-carbon,green and environmentally friendly energy with advantages of large reserves and sustainable utilization.Mine geothermal is a kind of geothermal resources.With the gradual advance of coal mining to the deep,the geothermal resources in the mine rock mass and mine system have considerable development value.However,the analysis and evaluation of the inland thermal resources system in the mining area are rarely carried out,and the evaluation method is relatively single,and the systematic comprehensive evaluation of geothermal resources potential is lacking.The mining depth of Pingdingshan mining area is more than kilometers,the carbonate rocks are widely developed,the temperature of the original rock exceeds 40℃,a large amount of high temperature and high pressure karst water exists,the heat storage is well developed,and the geothermal phenomenon is obvious.This thesis takes the deep geothermal resources of Pingmei No.10 Mine as the research object,adopts the research methods such as field investigation,data collection,theoretical analysis and systematic evaluation,and makes accurate calculation and systematic evaluation on the geothermal geological conditions,geothermal causes,geothermal resources and geothermal fluid quality of No.10 mine,and proposes reasonable development and utilization plans to evaluate the geothermal development and utilization prospects.The main research results are as follows:（1）The borehole data of Pingmu-10 mine and its adjacent areas are collected and sorted out,and the formation mechanism of heat storage in Pingmu-10 mine is analyzed.The basic cause of geothermal is the"whole uplift+middle syncline"ground barrier structure in the mining area,which makes deep geothermal easy to conduct upward.The heat source of mine geothermal is deep geothermal slow heat.The channel is the big fault around the mining area and the mining-induced fissure.The thermal reservoir is the Cambrian carbonate aquifer.The cover layer is covered by bauxite mudstone,coal seam and Cenozoic clay layer.（2）The Monte Carlo optimization statistical method considering the correlation between the parameters affected by mine mining characteristics and the calculation parameters of heat storage is proposed.The thermal energy of hot water in Pingmei 10mine is 5.65×10¹⁸ J,equivalent to 19.2 Mt of standard coal.The heat stored in the rock is 4.27×10¹⁹ J,equivalent to standard coal 145 Mt,and the total amount of geothermal resources is equivalent to standard coal 164.2 Mt.（3）The hydrogeological conditions of the mining area were analyzed,and the salinity,acid-alkalinity,corrosivity,scaling property and the contents of various trace elements of the mine geothermal water were determined.The hot water of Pingmei Coal Mine reached the named concentration and temperature of natural mineral water for physiotherapy,and also contained other trace elements and minerals beneficial to human body such as fluorine,bromine,lithium,chromium and metaborate acid,which had high physiotherapy value.Geothermal water is free from corrosion and scaling.（4）Put forward the mine geothermal water step utilization scheme,and carried on the economic,environmental and social benefits analysis.The heat load of heating is calculated,and compared with traditional coal-fired heating,the economic,environmental and social benefits generated by geothermal heating are evaluated comprehensively.It is considered that geothermal heating has obvious advantages of economic benefits,environmental friendliness and carbon emission reduction.There are 33 figures,32 tables and 83 references in this thesis.