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福建盐田海水补给型地热系统地球化学特征及其成因

刘春雷 李亚松 洪炳义 曹胜伟 王婉丽 李剑锋

刘春雷,李亚松,洪炳义,等. 福建盐田海水补给型地热系统地球化学特征及其成因[J]. 水文地质工程地质,2023,50(1): 158-167 doi:  10.16030/j.cnki.issn.1000-3665.202205017
引用本文: 刘春雷,李亚松,洪炳义,等. 福建盐田海水补给型地热系统地球化学特征及其成因[J]. 水文地质工程地质,2023,50(1): 158-167 doi:  10.16030/j.cnki.issn.1000-3665.202205017
LIU Chunlei, LI Yasong, HONG Bingyi, et al. Geochemical characteristics and formation mechanisms of the seawater-recharged geothermal systems in Yantian of Fujian, China[J]. Hydrogeology & Engineering Geology, 2023, 50(1): 158-167 doi:  10.16030/j.cnki.issn.1000-3665.202205017
Citation: LIU Chunlei, LI Yasong, HONG Bingyi, et al. Geochemical characteristics and formation mechanisms of the seawater-recharged geothermal systems in Yantian of Fujian, China[J]. Hydrogeology & Engineering Geology, 2023, 50(1): 158-167 doi:  10.16030/j.cnki.issn.1000-3665.202205017

福建盐田海水补给型地热系统地球化学特征及其成因

doi: 10.16030/j.cnki.issn.1000-3665.202205017
基金项目: 中国地质调查局地质调查项目(DD20190303; DD20221773)
详细信息
    作者简介:

    刘春雷(1984-),男,硕士,助理研究员,主要从事水文地质、地热地质方面的研究。E-mail:chunleiliu-dn@163.com

    通讯作者:

    李亚松(1983-),男,博士,研究员,主要从事区域地下水污染、环境地质方面的研究。E-mail:liyasong@mail.cgs.gov.cn

  • 中图分类号: P314

Geochemical characteristics and formation mechanisms of the seawater-recharged geothermal systems in Yantian of Fujian, China

  • 摘要: 海水补给型地热系统具有补给资源量大,但温度低、水质咸化等特点,查明沿海地热水循环补给条件和成因机制,对东南沿海地热资源的合理开发利用和保护具有重要意义。在泉州官桥盐田地热区分别采集了地热水、地下水和海水样品14个,利用水化学同位素特征分析和地球化学温标法,揭示了官桥盐田地热水循环补给和地热资源成因机制。结果表明:地热水水化学类型为Cl—Na型水,与海水水化学类型一致;H01和H02的溶解性固体总量(TDS)分别为2610 mg/L和3 090 mg/L,地下水以TDS小于400 mg/L的$ {\rm{HCO}}_3$—Na型水为主;地热水富集Br,地下水中Br未检测,表明盐田地热水存在现代海水或者海相沉积层古海水补给。根据盐田地热田H01和H02地热水Cl混合模型计算,地热水H01海水混入比为9.13%,H02海水混入比为10.76%,显示H01在出露于第四系地层后混入了更多的地下水。综合分析认为,海水是盐田地热水的重要补给资源,地热水化学组分受海水混合作用影响明显,深层热水上升过程中存在两次或者多次地下水或者海水混入从而形成浅层热储,采用SiO2 地热温标和多矿物平衡法估算的浅层热储温度在89~121 °C之间。
  • 图  1  盐田地质简图和采样点分布图

    Figure  1.  Geological sketch of Yantian and the distribution of sampling points

    图  2  盐田水样Piper三线图

    Figure  2.  Piper trilinear diagram of water samples from Yantian

    图  3  盐田地热田地下水SiO2与Cl质量浓度分布图

    Figure  3.  Distribution of SiO2 and Cl concentrations in groundwater in Yantian

    图  4  官桥盐田地下水Cl、Br质量浓度分布图

    Figure  4.  Distribution of Cl and Br concentrations in groundwater inYantian

    图  5  盐田地热水稳定氢氧同位素分布图

    Figure  5.  Distribution of stable hydrogen and oxygen isotopes in geothermal water in Yantian

    图  6  盐田地热水样品Na-K-Mg三角图

    Figure  6.  Na-K-Mg ternary diagram of geothermal water samples inYantian

    图  7  盐田地热水点各种矿物SI-T

    Figure  7.  SI-T diagram of minerals from Geothermal water in Yantian

    图  8  东南沿海海水补给型地热资源成因模式示意图

    Figure  8.  Diagram of the genetic model of seawater recharge geothermal resources in the southeast coast of China

    表  1  官桥盐田地下水化学测试结果表

    Table  1.   List of hydrochemical characteristics of groundwater in Yantian

    样品
    编号
    井深
    /m
    ρ(K+
    /(mg∙L−1
    ρ(Na+
    /(mg∙L−1
    ρ(Ca2+
    /(mg∙L−1
    ρ(Mg2+
    /(mg∙L−1
    ρ(Cl
    /(mg∙L−1
    ρ(${\rm{SO}}_4^{2-} $)
    /(mg∙L−1
    ρ(${\rm{HCO}}_3^-$)
    /(mg∙L−1
    ρ($ {\rm{CO}}_3^{2-}$)
    /(mg∙L−1
    ρ(Br
    /(mg∙L−1
    TDS
    /(mg∙L−1
    ρ(SiO2
    /(mg∙L−1
    pHδD
    /‰
    δ18O
    /‰
    H0150.019.67534.90415.102.531 418.00109.2067.120.004.512 610.069.607.03−41.00−6.20
    H02500.022.57683.20456.703.731 667.00115.3076.410.004.293 090.074.117.15−39.75−5.82
    C01100.05.6017.8013.783.9926.552.2654.920.00<0.10167.957.006.51−40.00−6.10
    C02100.06.1142.5641.2712.8565.3214.6556.140.000.13369.545.546.47−41.00−6.20
    C03100.02.2523.8127.276.2612.9212.02115.900.00<0.10212.345.036.81−45.00−6.70
    C0490.00.9531.9135.772.6822.709.58151.300.00<0.10244.062.457.55−46.00−6.80
    C05164.00.9870.3232.043.3011.5364.47183.100.00<0.10314.134.397.79−41.00−6.30
    C06110.00.9232.4347.120.8722.704.05170.200.00<0.10245.036.697.22−37.00−5.10
    C07109.02.2021.3531.729.8526.202.28102.500.00<0.10259.049.937.17−41.00−6.30
    C08100.05.1719.1025.275.6631.783.4773.830.00<0.10217.057.256.62−37.00−5.10
    S01279.707 645.00309.90942.0014 233.001 750.001 240.000.0032.3525 310.05.477.24
    S02322.508 590.00349.501 077.0016 154.001 900.00135.900.0030.9429 000.03.927.63
    S03274.207 355.00303.30912.0013 535.001 582.00141.800.0024.8624 050.07.137.24
    S04344.409 435.00374.301 176.0017 115.002 116.00135.900.0037.5131 160.03.247.84
    注:“−”表示无数据;“0.00”表示低于检出限;ρ表示质量浓度。
    下载: 导出CSV

    表  2  官桥盐田地热水热储温度估算结果

    Table  2.   Estimated results of geothermal reservoir temperature of geothermal water in Yantian

    样品
    编号
    水温
    /°C
    钾钠温标
    (Fournier[17]
    /°C
    钾钠温标
    (Giggenbach[39]
    /°C
    石英温标
    (无蒸汽)
    /°C
    玉髓温标
    /°C
    多矿物
    溶解平衡
    /°C
    H01441441631188990
    H024713715712193110
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-05-07
  • 录用日期:  2022-08-05
  • 修回日期:  2022-08-05
  • 网络出版日期:  2022-12-14
  • 刊出日期:  2023-01-13

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