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现代地质 ›› 2025, Vol. 39 ›› Issue (02): 429-439.DOI: 10.19657/j.geoscience.1000-8527.2023.056

• 表生资源观测模拟与综合评价 • 上一篇    下一篇

冀东平原馆陶组地热流体水化学成分和H-O同位素组成特征及其地质意义

徐一鸣1,2(), 李傲宇3, 程立群1,2(), 杜立新4, 张艳帅5, 郝文辉1, 刘亮1   

  1. 1.河北省地质矿产勘查开发局第八地质大队,河北 秦皇岛 066000
    2.河北宝地建设工程有限公司,河北 秦皇岛 066000
    3.中国地质矿业有限公司,北京 100029
    4.河北省地质矿产勘查开发局第七地质大队,河北 雄安 071700
    5.中国地质大学(北京)水资源与环境学院,北京 100083
  • 出版日期:2025-04-10 发布日期:2025-05-08
  • 通信作者: 程立群,男,工程硕士,高级工程师,1981年出生,矿产地质专业,主要从事地热、矿产地质等方面的研究工作。Email: qhdchengliqun@163.com
  • 作者简介:徐一鸣,男,硕士,高级工程师,1991年出生,水文工程地质专业,主要从事地热地质、矿泉水等方面的研究工作。Email: Xeamoon@163.com
  • 基金资助:
    河北省自然资源厅项目“冀东平原区地热资源勘查”(2017020)

Hydrochemistry and H-O Isotopic Constraints of Geothermal Fluids in the Guantao Formation in the Eastern Hebei Plain: Implications for Geothermal Reservoir Dynamics

XU Yiming1,2(), LI Aoyu3, CHENG Liqun1,2(), DU Lixin4, ZHANG Yanshuai5, HAO Wenhui1, LIU Liang1   

  1. 1. The Eighth Geological Brigade of Hebei Bureau of Geology and Mineral Resources Exploration,Qinhuangdao,Hebei 066000,China
    2. Hebei Baodi Construction Engineering Corporation,Ltd,Qinhuangdao,Hebei 066000,China
    3. China National Geological & Mining Corporation,Beijing 100029,China
    4. The Seventh Geological Brigade of Hebei Bureau of Geology and Mineral Resources Exploration,Xiong’an,Hebei 071700,China
    5. School of Water Resources and Environment,China University of Geosciences(Beijing),Beijing 100083,China
  • Published:2025-04-10 Online:2025-05-08

摘要: 冀东平原新近系馆陶组热储为碎屑岩类孔隙型层状热储,地热地质条件优越。为了科学保护、合理利用该地热资源,本文对冀东平原不同地质构造单元所采集的16个馆陶组地热水样开展了化学成分和H-O同位素组成分析。结果显示,冀东平原馆陶组地热水pH值范围7.78~8.62、矿化度722.3~2619 mg/L、水化学类型主要有HCO3·SO4-Na、HCO3·Cl-Na、SO4·Cl-Na型;热水中F-、SiO2、溶解性总固体、锶、锌、溴、碘、铁、锰、偏硼酸等含量较高,但与西藏羊八井和搭格架相比,地热水中一些与岩浆热液活动相关的元素(如F、B、As、Li等)含量要低得多。H-O同位素特征显示,地热水中δD值为-71‰~-73‰,δ18O值为-7.6‰~-9.8‰,地热水补给高程800~1300 m,总体径流方向由西北向东南,地热水与上覆浅部地层水联系不密切,主要受侧向同层径流补给及古生界奥陶系热流体的顶托补给,为深层承压水,属深循环加热成因的地下热水。燕山地区山地大气降水在重力的作用下沿断裂构造向下运移,并向东南径流,地下水被来自地壳深部的热不断加温,水-岩反应逐渐剧烈,溶滤作用,导致热水中矿物质含量显著增加。随着循环深度和距离的增加,地热水赋存环境越来越封闭,水体更新速率逐渐降低,地热水发生脱硫酸作用,同时与下伏深部热储地热流体发生混合作用,主要离子也随之发生了变化。本研究为理解馆陶组地热水的形成与演化过程提供了科学依据。

关键词: 水化学特征, 同位素特征, 地热水, 馆陶组, 冀东平原

Abstract:

The Neogene Guantao Formation geothermal reservoir in the Eastern Hebei Plain represents a clastic porous layered heat reservoir characterized by superior geothermal geological conditions. To facilitate the scientific conservation and rational utilization of these geothermal resources, this study presents comprehensive analysis of the chemical and H-O isotopic compositions of 16 geothermal water samples collected from various geological units within the Eastern Hebei Plain. Experimental results reveal that the primary hydrochemical types of the Guantao Formation geothermal water are HCO3· SO4-Na, HCO3·Cl-Na, SO4·Cl-Na, with pH values ranging from 7.78 to 8.62 and salinity levels between 722.3 and 2619 mg/L. The geothermal water exhibits elevated concentrations of F-, SiO2, TDS, Sr, Zn, Br, I, Fe, Mn, and HBO2. However, concentrations of certain elements associated with magmatic hydrothermal activities (such as F, B, As, Li, etc.) are significantly lower compared to those found in Yangbajing and Dagejia in Tibet. H-O isotopic analysis indicates δD values ranging from -71‰ to -73‰ and δ18O values from -7.6‰ to -9.8‰, suggesting a recharge elevation of 800 to 1300 meters. The geothermal water primarily flows from northwest to southeast, with minimal interaction with overlying shallow strata water. It is predominantly recharged by lateral flow within the same layer and the upward migration of Ordovician hot fluids from the Paleozoic erathem, classifying it as deep-circulation heated groundwater. Atmospheric precipitation from the Yanshan area percolates downward along fault structures under gravitational force, flowing southeastward. As the groundwater is progressively heated by deep crustal thermal sources, water-rock interactions intensify, leading to a significant increase in mineral content. With increasing circulation depth and distance, the geothermal water environment becomes more confined, resulting in a gradual reduction in water renewal rates. Desulfation processes occur within the geothermal water, which also mixes with underlying deep geothermal fluids, altering the primary ion composition. This study provides a scientific foundation for understanding the formation and evolution of geothermal water in the Guantao Formation.

Key words: hydro-geochemical characteristics, isotopic characteristics, geothermal, Guantao formation, eastern Hebei Plain

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