| 基于水文地球化学特征的辽宁丹东地区地热水成因模式研究 |
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| 引用本文： | 杨峰田,石宇佳,李文庆. 基于水文地球化学特征的辽宁丹东地区地热水成因模式研究[J]. 现代地质, 2022, 36(2): 474-483. DOI: 10.19657/j.geoscience.1000-8527.2022.017 |
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| 作者姓名： | 杨峰田 石宇佳 李文庆 |
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| 作者单位： | 1. 吉林大学 新能源与环境学院,吉林 长春 1300212. 吉林大学 地下水资源与环境教育部重点实验室,吉林 长春 1300213. 吉林大学 地球科学学院,吉林 长春 1300214. 自然资源部东北亚矿产资源评价重点实验室,吉林 长春 130021 |
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| 基金项目： | 国家自然科学基金项目(41202167)； |
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| 摘 要： | 辽宁丹东地区地热资源丰富,阐明其地热田的成因模式对于区域热水资源的可持续开发利用具有重要意义。以区内北汤、东汤、五龙背地热田为研究对象,进行水化学和同位素分析。结果表明,北汤、东汤、五龙背地热水的水化学类型分别为SO4·Cl-Na·Ca型、HCO3·SO4-Na型、 HCO3-Na·Ca、HCO3·SO4-Na和HCO3·Cl-Na型。研究区的热水来源为大气降水,北汤、东汤地热田的补给高程分别为678 m和376 m。根据14C测年方法,得出北汤、东汤和五龙背地热田地热水年龄分别为2 000~3 300 a B.P.、2 200~7 200 a B.P.和700~2 900 a B.P.。根据二氧化硅地温计和lg(Q/K)方法,北汤、东汤和五龙背地热田的热储温度分别为92 ℃、120 ℃和100~101 ℃,相应的地热水循环深度分别为1 900 m、3 000 m和800~1 800 m。地热水接收大气降水入渗补给,经断裂带深循环加热,于NNE和NW向两组断裂交汇处上涌进入浅部含水层或出露地表成泉,属中低温对流型地热系统。
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| 关 键 词： | 丹东 地热田 成因模式 中低温对流型地热系统 |
| 收稿时间： | 2021-08-06 |
| 修稿时间： | 2022-03-02 |
Genesis Model of Geothermal Water in Dandong Area of Liaoning Province Based on Hydrogeochemical Characteristics |
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| YANG Fengtian,SHI Yujia,LI Wenqing. Genesis Model of Geothermal Water in Dandong Area of Liaoning Province Based on Hydrogeochemical Characteristics[J]. Geoscience of Geosciences, 2022, 36(2): 474-483. DOI: 10.19657/j.geoscience.1000-8527.2022.017 |
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| Authors: | YANG Fengtian SHI Yujia LI Wenqing |
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| Affiliation: | 1. College of New Energy and Environment, Jilin University, Changchun, Jilin 130021, China2. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun, Jilin 130021, China3. College of Earth Sciences, Jilin University, Changchun, Jilin 130021, China4. Key Laboratory of Northeast Asia Mineral Resources Evaluation, Ministry of Natural Resources, Changchun, Jilin 130021, China |
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| Abstract: | Geothermal resources are abundant in Dandong. It is of great significance to establish the genesis model of the geothermal fields for sustainable utilization and further development. The geothermal fields of Bei-tang, Dongtang and Wulongbei were investigated for hydrochemical and isotopic analysis. The results show that the hydrochemical types of Beitang, Dongtang and Wulongbei geothermal water are SO4·Cl-Na·Ca, HCO3·SO4-Na and HCO3-Na·Ca, HCO3·SO4-Na and HCO3·Cl-Na, respectively. The source of the thermal water is atmospheric precipitation. The recharge elevations of Beitang and Dongtang geothermal fields are 678 and 376 m, respectively. According to 14C dating methods, the ages of the thermal waters in Beitang, Dongtang and Wulongbei geothermal fields are 2,000-3,300 and 2,200-7,200 and 700-2,900 a B.P., respectively. The reservoir temperatures of Beitang, Dongtang and Wulongbei geothermal fields are predicted to be 92, 120, and 100-101 ℃, respectively according to the silica and lg(Q/K) geothermometer. The thermal water circulation depth of Beitang, Dongtang and Wulongbei geothermal fields are ca. 1,900, 3,000 and 800-1,800 m, respectively. The thermal water is heated up during deep circulation through the fault zone, and then upwelled into shallow aquifers or outcrops as springs at the intersection of NNE and NW trending faults, which belong to low to medium temperature geothermal system of convective type. |
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| Keywords: | Dandong geothermal field genesis model low to medium temperature geothermal system of convective type |
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