水文地球化学方法在地热资源勘查中的应用: 以湖北省应城市为例

卫兴; 师红杰; 陈松; 尚建波; 刘明亮

doi:10.19509/j.cnki.dzkq.tb20230606

水文地球化学方法在地热资源勘查中的应用: 以湖北省应城市为例

doi: 10.19509/j.cnki.dzkq.tb20230606

卫兴^{1a, 1b,},
师红杰^{1a, 1b},
陈松^{2a, 2b, ,},
尚建波^{1a, 1b},
刘明亮^{1a, 1b}

1a.
长江大学油气地球化学与环境湖北省重点实验室, 武汉 430100
1b.
长江大学资源与环境学院, 武汉 430100
2a.
湖北省地质局资源与生态环境地质湖北省重点实验室, 湖北孝感 432000
2b.
湖北省地质局第六地质大队, 湖北孝感 432000

基金项目:

国家自然科学基金项目 41902257

地热资源勘查与开发利用山西省重点实验室开放基金项目 SX202205

宁夏回族自治区重点研发计划项目 2022BEG03060

自然资源部深部地热资源重点实验室开放基金项目 KLDGR2022G01

详细信息

作者简介:
卫兴, E-mail: yangtzeweixing@163.com

通讯作者:
陈松, E-mail: ChenSong231028@163.com

中图分类号: P314.3;TK521
计量
- 文章访问数: 353
- PDF下载量: 110
- 被引次数: 0
出版历程
- 收稿日期: 2023-10-30
- 录用日期: 2024-02-02
- 修回日期: 2024-01-15

Application of hydrogeochemical methods in geothermal resource exploration: A case study of Yingcheng City, Hubei Province

WEI Xing^{1a, 1b
,},
SHI Hongjie^{1a, 1b},
CHEN Song^{2a, 2b
, ,},
SHANG Jianbo^{1a, 1b},
LIU Mingliang^{1a, 1b}

1a.
Hubei Key Laboratory of Petroleum Geochemistry and Environment, Yangtze University, Wuhan 430100, China
1b.
College of Resources and Environment, Yangtze University, Wuhan 430100, China
2a.
Hubei Key Laboratory of Resources and Eco-Environment Geology, Xiaogan Hubei 432000, China
2b.
Six Geological Team of Hubei Geological Bureau, Xiaogan Hubei 432000, China

More Information

Author Bio:
WEI Xing, E-mail: yangtzeweixing@163.com

Corresponding author: CHEN Song, E-mail: ChenSong231028@163.com

摘要

摘要:
地热流体水文地球化学研究在指示地热资源的形成机制、赋存环境以及预测地热资源有利勘查区等方面具有广泛应用。为了探究湖北省应城市地热系统的热源以及成因机制, 并对其地热异常区进行圈定。基于研究区内地热水与浅层地下冷水的水化学及同位素特征, 探讨了地热流体中主要组分的地球化学起源, 评估了地热流体的热储温度。结合区内浅层地下冷水的温度与水化学数据, 对地热异常区进行了圈定。研究结果表明, 地热水水化学类型主要为SO₄-Ca型, 地热系统主要的热储围岩为海相碳酸盐岩, 通过地热温标计算热储温度约112.2 ℃。大气降水入渗和碳酸盐岩热储层中的水-岩相互作用是地热水中化学组分的主要来源。地热水的水化学和氢氧同位素特征指示地热水的补给来源为研究区西部山区的大气降水, 大气降水由补给区入渗后向东南盆地中心不断运移, 循环深度为3 436.7~5 030.2 m。通过与典型岩浆热源型地热系统的对比以及岩石样品中放射性元素的数据结果, 得出应城地热系统是由地温梯度正常加热而形成的。结合区内浅层地下冷水的温度与水化学数据, 最终圈定地热异常区位于应城市区西南陈河镇以北地区, 但仍需考虑井深、人为污染等客观限制因素对圈定结果的影响。
- 水文地球化学 /
- 地热温标 /
- 地热异常 /
- 地热资源勘查 /
- 地热系统 /
- 应城市
Abstract: <p>Hydrogeochemical studies of geothermal fluid are widely used to determine the formation mechanism and occurrence environment and predict favourable exploration areas for geothermal resources.</p></sec><sec><title>Objective
In order to understand the heat source and causative mechanisms of the geothermal system, the areas of geothermal anomalies are delineated in Yingcheng City, Hubei Province.
Methods
This study examines the geochemical origins of major components in geothermal fluid and evaluates the thermal reservoir temperatures of geothermal fluid based on the hydrochemical and isotopic characteristics of geothermal water and shallow groundwater. By integrating the temperature and hydrochemical data of shallow groundwater in the area, the geothermal anomaly zones are delineated.
Results
The results show that geothermal water hydrochemistry is mainly SO₄-Ca, and the main thermal storage enclosing rock of the geothermal system is marine carbonate rock, with a thermal reservoir temperature of approximately 112.2 ℃. Atmospheric precipitation infiltration and water-rock interactions in carbonate thermal reservoirs are the main sources of chemical components in geothermal water. The hydrochemical and hydrogen-oxygen isotope characteristics of the geothermal water indicate that the recharge source of the geothermal water is the precipitation from the mountainous areas in the western part of the study area.The atmospheric precipitation infiltrates from the recharge area and then continuously moves to the centre of the southeastern basin with a circulation depth of 3 436.7 m to 5 030.2 m.
Conclusion
Comparisons with the typical magma-heat source type of geothermal system as well as the results of the data of radioactive elements in the rocks, this study showed that the geothermal system of Yingcheng is formed by the heating of geothermal temperature gradient. Combined with the temperature and hydrochemistry data of the shallow underground cold water in the area, the final geothermal anomaly area is located in North of Chenhe Town Southwest of Yingchengcity, but the influence of objective constraints such as well depths and anthropogenic contamination on the results of the circle still needs to be considered.
- hydrogeochemistry /
- geothermometer /
- geothermal anomaly /
- geothermal resource exploration /
- geothermal system /
- Yingcheng City
注释:

所有作者声明不存在利益冲突。

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图 1 研究区地质简图及采样点分布图(a)和地质剖面示意图(b)

Figure 1. Simplified geological map and sampling locations (a) and geological profile (b) in the study area

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图 2 研究区水样Piper三线图

Figure 2. Piper plot of water samples in the study area

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图 3 研究区水样微量组分箱线图

Figure 3. Box plot of microcomponents of water samples in the study area

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图 4 研究区地热水c(HCO₃^-+2SO₄^2-)与c(Ca²⁺+Mg²⁺)关系图

Figure 4. Plots of (HCO₃^-+2SO₄^2-) concentration and (Ca²⁺+Mg²⁺) concentration in geothermal water in the study area

下载: 全尺寸图片幻灯片

图 5 应城与羊八井地热水样Na-K-Mg三角图(a)和微量元素柱状图(b)(羊八井数据引自文献[33-34])

Figure 5. Triangular diagram of Na-K-Mg (a) and trace element histogram (b) of geothermal water samples in Yingcheng and Yangbajing

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图 6 研究区水样δD-δ¹⁸O关系图

Figure 6. δD-δ¹⁸O plot of water samples in the study area

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图 7 应城地热系统形成机制的概念模型^[21]

Figure 7. Conceptual model of the formation mechanism of the Yingcheng geothermal system

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图 8 研究区井深40 m(a), 50 m(b), 60 m(c), 70 m(d)地温等值线图

Figure 8. Geothermal temperature contour at depths of 40 m (a), 50 m (b), 60 m (c), and 70 m (d) in the study area

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图 9 研究区地下水中ρ(B)(a)，ρ(Sr)(b)，ρ(Li)(c)以及综合异常质量浓度(d)等值线图

Figure 9. Contour maps of B (a), Sr (b), Li (c) concentrations, and comprehensive anomaly concentration (d) in groundwater in the study area

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表 1 研究区地下水样品水化学特征

Table 1. Hydrochemical characteristics of groundwater samples in the study area

表 2 研究区岩石样品的铀、钍、钾质量分数以及放射性生热率

Table 2. U, Th, K compositions and the radiogenic heating rate of granite samples in the study area

样品编号	岩石类型	w(K)/%	w(Th)/10^-6	w(U)/10^-6	生热率A/(μW·m^-3)
R01	花岗岩	1.03	0.59	0.21	0.19

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表 3 研究区地热水热储温度及循环深度

Table 3. Reservoir temperatures and circulation depths of geothermal water in the study area

样品编号	石英温标/℃	玉髓温标/℃	Na-K温标/℃	K-Mg温标/℃	循环深度/m
YC16	130.2	99.7	383.2	106.0	4 005.7
SK2	119.2	88.0	231.8	58.3	3 436.7
SK3	125.9	95.1	245.2	58.4	3 782.3
1号孔	147.5	118.3	353.1	102.4	4 913.4
2号孔	149.7	120.7	322.4	100.5	5 030.2
9号-1	139.6	109.9	369.6	100.8	4 500.9
9号-2	147.3	118.1	360.0	102.9	4 904.9
11号-1	144.4	115.0	363.4	100.4	4 753.1
11号-2	143.4	113.9	363.8	100.4	4 699.6
2#	148.9	119.9	346.9	101.2	4 988.9
58#	149.7	120.7	335.2	101.5	5 030.2
八角池	149.7	120.7	339.7	101.5	5 030.2
三池	149.7	120.7	345.1	100.2	5 030.2
一池	139.6	109.9	345.3	101.5	4 500.9

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