摘要
针对郑州市西南郊埋藏型下古生界碳酸盐岩中储存丰富的地热资源,开展了该区域主要热储层水化学剖面研究,分析了水化学及同位素特征。结果表明:地热流体水化学类型以SO4-Ca、SO4·HCO3-Ca型为主,为弱碱性水、淡水-微咸水;通过热平衡分析结合离子分析综合判断,地热流体处于水岩作用初级阶段,采用石英温标估算热储温度为52.9~92.4℃,热储循环深度1 388~3 069 m;西部、西南部海拔606~920 m低山区的大气降水是主要补给源,在向东部平原漫长的迁移过程(运移速率1.571~0.129 m/a)中与碳酸盐岩矿物和石膏产生强烈的水-岩作用,并在深部的溶洞、溶隙及基岩裂隙中积蓄了大量的水热能,构造适宜地段,3 000 m深度有望获得70℃以上的地热流体。研究成果不仅深化了该地区下古生界碳酸盐岩热储层的水化学特征认识,还可进一步有效指导该地区水热型地热资源的勘探开发。
In order to investigate the rich geothermal resources stored in buried Lower Paleozoic carbonate rocks in the southwestern outskirts of Zhengzhou,a study on the hydrochemical profile of the main thermal reservoir layers in this area was conducted,through the analysis of hydrochemical and isotopic characteristics.The results show that:the hydrochemical types of geothermal fluids are mainly SO 4-Ca and SO 4·HCO 3-Ca,which are weak alkaline water and fresh-brackish water.According to the comprehensive judgment of heat balance analysis and ion analysis,the geothermal fluid is in the initial period of water-rock interaction.The thermal storage temperature is estimated to be 52.9~92.4℃by quartz temperature scale,and the circulating depth of the thermal storage is 1388~3069 m.The main supply source is the atmospheric precipitation in the low mountain area of the west and southwest,which is 606~920 m above sea level.During the long migration process to the eastern plain(the migration rate is about 1.571~0.129 m/a),strong water-rock interaction is caused by carbonate rock minerals and gypsum,and a large amount of hydrothermal energy is accumulated in the deep karst caves,dissolution gaps and bedrock fractures.Geothermal fluids above 70℃are expected to be obtained at 3000 m depth.The research results not only deepen the understanding of the hydrochemical characteristics of the Lower Paleozoic carbonate reservoirs in the region,but also provide valuable guidance for the exploration and development of hydrothermal geothermal resources in this area.
作者
龚晓洁
田良河
冯园
王豫飞
尚茹
GONG Xiao-jie;TIAN Liang-he;FENG Yuan;WANG Yu-fei;SHANG Ru(Henan Academy of Geological,Zhengzhou 450001,China;Underground Clean Energy Exploration&Development Technology Innovation Strategic Alliance,Zhengzhou 450001,China;Henan Urban Geological Engineering Research Center,Zhengzhou 450001,China;Henan Institute of Geological Sciences,Zhengzhou 450001,China)
出处
《科学技术与工程》
北大核心
2024年第7期2647-2656,共10页
Science Technology and Engineering
基金
河南省财政资金重点项目(豫自然资发[2019]22号)
中国地质科学院项目(12120113077300)
河南省地质研究院地质科技攻关项目(2023-901-XM001-KT01,2023-901-XM002-KT01)。
