江西省遂川县热水洲地热水成因机制与循环特征OA

An accurate understanding of geothermal origin and the establishment of a geothermal water circulation model are crucial for the scientific assessment and effective development of geothermal resources.Based on comprehensive analyses of hydrogeological,structural,and geothermal conditions,combined with hydrochemical and isotopic test data,this study systematically investigated the origin and circulation characteristics of geothermal water in the Reshuizhou area,Suichuan County,Jiangxi Province.Methods,including correlation analysis and geochemical thermometers,were applied.A model for calculating the geothermal contribution rate was established based on the theory of terrestrial heat flow field and principles of heat conduction.The results indicate that the geothermal water in this area is recharged by atmospheric precipitation,with the recharge zone located in the northwestern block of the Huang'ao fault zone.Recharge elevations derived from hydrogen and oxygen isotopes range from 761-907 m and 751-970 m,respectively,averaging 846 m.The silica geothermometer indicates a reservoir temperature between 75 and 129℃,a circulation depth of 2.30 to 3.35 km,and groundwater residence times of 1,934 and 3,265 years.The heat sources consists of 64%-68%conductive heat from the the Curie interface,approximately 20%from radiogenic heat production,and the remaining 12%-16%from other sources.Geothermal water migrates mainly along fractures and structural breccia zones in the Huang'ao fault zone,as well as through NW-trending tensional faults.Two main typles of water storage structures are identified:(1)pore-fracture systems within fault zones bounded by silicified structural aquicludes;(2)fractured zones formed by the intersection of NE-trending,nearly E-W-trending,and NW-trending faults.This study preliminarily establishes a circulation model for geothermal water in the Reshuizhou area,providing a scientific basis for evaluating and developing of geothermal resources.