太行山东南麓断裂带水文地球化学特征及水热成因模式OA北大核心CSTPCD
Hydrogeochemical characteristics and hydrothermal genesis model of the fracture zone in the southeastern foothills of Taihang Mountains
太行山东南麓断裂带发育,赋存丰富的中低温地热资源,然而,该地区深部地热水的水热成因模式依然不清楚.通过55组地热水和38组浅层地下水的水化学组分特征,研究离子组分来源及其运移规律,并借助同位素特征分析地热水补给来源,在此基础上分析深部热储的水岩平衡状态、热储温度和热循环深度.结果表明:研究区属对流—传导复合型地热系统,地热水整体处于氧化环境,离子组分以HCO3-和Na+为主,主要受盐岩和碳酸盐岩等矿物的溶解及阳离子交替吸附作用控制;地热水的补给高程为1 010～1 153 m,表明地热水补给区位于太行山东南麓西部的太行山地区;地热水循环深度范围为1 125～4468 m;混合比例法估算汤阴断陷深层热储温度达到110～160 ℃,而汤阴断陷东部的内黄凸起地区为80～110℃,二者热储温度差别源自汤阴断陷两侧深切地幔的汤东、汤西深大断裂导热导水条件良好,以及内黄凸起的基岩埋深较浅,上伏盖层薄,热能更容易散失.本研究揭示了太行山东南麓地热系统的水文地球化学特征和水热成因模式,为该区地热资源开发利用提供重要依据.
The fracture zone in the southeast foothills of the Taihang Mountains is well developed and endowed with abundant medium and low temperature geothermal resources.However,the hydrothermal genesis pattern of deep geothermal water in this area remains unclear.Based on the hydrochemical composition characteristics of 55 geothermal water and 38 shallow groundwater,this study analyzed the source and migration law of ion components,and the recharge source of geothermal water leveraging isotope characteristics.On this basis,the water-rock equilibrium state,temperature,and depth of thermal cycle of deep thermal reservoirs were revealed.The results show that the study area is a convective-conducting composite geothermal system,and the geothermal waters as a whole are in an oxidizing environment,with the ionic fractions dominated by HCO3-and Na+,which are mainly controlled by the dissolution of minerals,such as salt rock and carbonate,as well as by the cation exchange.Furthermore,the recharge elevation of the geothermal water ranges from 1 010 to 1 153 m,which indicates that the recharge area of the geothermal water is located in the western part of the Taihang Mountains.The depth of the circulation ranges from 1 125 to 4 468 m.The estimation of the mixing ratio method indicates that the temperature of the deep thermal storage of the Tangyin Rift reaches 110 to 160 ℃,while that of the Neihuang Uplift is 80 to 110 ℃.The difference in thermal reservoir temperature is caused by the good conditions of heat and water conductivity of Tangdong and Tangxi deep faults on both sides of the Tangyin fault,and the shallow buried depth of bedrock of the Neihuang Uplift with the thin overlying cap rock,which makes the heat energy more easily dissipated.The study reveals the hydrogeochemical characteristics and hydrothermal genesis model of the geothermal system at the southeastern foot of Taihang Mountain and provides a important basis for the exploitation and utilization of geothermal resources in this area.
郑茹丹;熊超凡;平建华;苏向东;赵继昌;刘嘉麒
郑州大学水利与交通学院/河南省地热综合利用工程研究中心,河南郑州 450001黄冈市水利事业发展中心,湖北黄冈 438000郑州大学生态与环境学院/郑州大学地热与生态地质研究中心/河南省地热综合利用工程研究中心,河南郑州 450001中国地质环境监测院,北京 100081郑州大学生态与环境学院/郑州大学地热与生态地质研究中心/河南省地热综合利用工程研究中心,河南郑州 450001||中国科学院地质与地球物理研究所,北京 100029
地质学
水文地球化学地热成因热储温度氢氧同位素太行山东南麓断裂带
hydrogeochemistrygeothermal genesisreservoir temperaturehydrogen and oxygen isotopesthe fracture zone in the southeastern foothills of Taihang Mountains
《水文地质工程地质》 2024 (003)
43-56 / 14
郑州大学高层次人才基金项目(135-32340122);郑州大学院士团队科研启动基金项目(134-32340364;134-32340370)
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