广东惠州花岗岩体及其地热意义

旷健; 祁士华; 王帅; 肖志才; 张敏; 赵旭; 甘浩男

doi:10.3799/dqkx.2019.128

广东惠州花岗岩体及其地热意义

doi: 10.3799/dqkx.2019.128

旷健^1, ,,
祁士华^{1, 2, , ,},
王帅²,
肖志才¹,
张敏³,
赵旭⁴,
甘浩男⁵

1.
中国地质大学生物地质与环境地质国家重点实验室, 湖北武汉 430074
2.
中国地质大学环境学院, 湖北武汉 430074
3.
广东省有色金属地质局九三五队, 广东惠州 516001
4.
中石化石油工程地球物理有限公司, 湖北武汉 430223
5.
中国地质科学院水文地质环境地质研究所, 河北石家庄 050061

基金项目:

中国地质调查局地调项目 1212011220014

详细信息

作者简介:
旷健(1995-), 男, 博士研究生, 主要从事地热学研究.E-mail:kuangjian@cug.edu.cn

通讯作者:
祁士华, E-mail:shihuaqi@cug.edu.cn

中图分类号: P314.9;P315.2
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出版历程
- 收稿日期: 2019-05-29
- 刊出日期: 2020-04-15

Granite Intrusion in Huizhou, Guangdong Province and Its Geothermal Implications

Kuang Jian^{1
,
,},
Qi Shihua^{1, 2
, ,
,},
Wang Shuai²,
Xiao Zhicai¹,
Zhang Min³,
Zhao Xu⁴,
Gan Haonan⁵

1.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China
2.
School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
3.
Team 935 of Guangdong Nonferrous Metals Geological Bureau, Huizhou 516001, China
4.
Petroleum Engineering and Geophysics Co., Ltd., SINOPEC, Wuhan 430223, China
5.
Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China

摘要

摘要: 为洞悉东南地区地热的形成演化，以惠州黄沙洞-石坝地区高温地热田为例，综合地震学、岩石地球化学、锆石U-Pb年代学等方法来解译该地热田的形成模式.研究区岩体主要为燕山期高分异高含产热元素的I型花岗岩，形成背景为古太平板块俯冲的前进与后撤；深部花岗岩体连为一体且厚度达3.5 km.高导热率的花岗岩促进地幔热传导至地表和花岗岩中放射性元素衰变产生的热量是惠州高温地热形成的两大重要原因.研究区深部花岗岩生热量及干热岩地热资源储量巨大.研究区地热产出模式对惠州乃至东南地区的能源供给系统有重大意义.
- 地热 /
- 地震反演 /
- 燕山期花岗岩 /
- 古太平洋板块 /
- 产热 /
- 东南地区 /
- 地热田
Abstract: In this paper, it presents a case study of the high-temperature geothermal field in Huizhou, China to interpret the formation model of this geothermal field and that of Southeast China by integrating seismics, geochemistry and the zircon U-Pb age. It is found that the magmatic intrusion in the study area is mainly Yanshanian I-type granite with high differentiation and high heat-producing elements, which has been formed by the subduction and the retreat of Paleo-Pacific Plate. The subterranean magmatic intrusion is an integrated whole with thickness up to 3.5 km. The heat transfer from the mantle to the surface promoted by the high thermal conductivity of granite, and the heat generated by radioactive element decay in granite are two important causes for high temperature geothermal formation in Huizhou. The subterranean granite in the study area has high heat production and inestimable geothermal resources of hot dry rock. The geothermal output model of this study area is of great significance to the energy supply system in Huizhou and even the Southeast China.
- geothermic /
- seismic inversion /
- Yanshanian granite /
- Paleo-Pacific Plate /
- heat production /
- Southeast China /
- geothermal fields

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图 1 研究区及周边大地构造图(a)，研究区地质图(b)和研究区地形图(c)

F₁.江绍断裂；F₂.吴川-四会断裂；F₃.阳江-河源断裂；F₄.紫金-博罗断裂；F₅.政和-大浦断裂；F₆.长乐-南澳断裂；RF.人字石断裂；HF.河源断裂；ZBF.紫金-博罗断裂

Fig. 1. Geotectonic map of the study area and adjacent areas (a), geological map of the study area(b) and topography map of the study area(c)

下载: 全尺寸图片幻灯片

图 2 典型锆石的阴极发光（CL）图像和花岗岩的谐和年龄图

红圈表示LA-ICP-MS测年打点位置，CL图像中的比例尺长度为100 μm

Fig. 2. Cathodoluminescence (CL) images of representative zircons and concordia plots of the granites

下载: 全尺寸图片幻灯片

图 3 研究区岩体TAS图(a), SiO₂-K₂O图解(b)和A/CNK-A/NK图解(c)

Ir.Irvine分界线，上方为碱性，下方为亚碱性

Fig. 3. TAS(a), SiO₂-K₂O(b), A/CNK-A/NK(c) diagrams of magmatic rocks in study area

下载: 全尺寸图片幻灯片

图 4 研究区岩体稀土元素配分模式图及微量元素蛛网图

球粒陨石标准化值据Sun and McDonough(1989），粉红线为Id⁃03样品

Fig. 4. REE distribution patterns and trace element spider diagram of magmatic rocks in the study area

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图 5 研究区岩体Rb-Y与Rb-Th相关图解

Fig. 5. Rb-Y and Rb-Th diagrams of magmatic rocks in the study area

下载: 全尺寸图片幻灯片

图 6 地震反演剖面

左侧为解译剖面图，右侧为地质剖面图

Fig. 6. Profiles of seismic inversion

下载: 全尺寸图片幻灯片

图 7 地震反演详细剖面图

a. DZ1测线中侵入岩岩体的地震反射特征；b. DZ1测线中早期侵入体和晚期侵入体反射特征及界线；c. DZ3剖面中玄武岩墙的地震反射特征；d. DZ3剖面中河源断裂的地震反射特征

Fig. 7. Detailed diagrams of seismic inversion

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图 8 SiO₂-FeO_T/(FeO_T+MgO)(a), SiO₂-Al₂O₃(b), (Y+Nb)-Rb(c)和(Yb+Ta)-Rb(d)构造环境图解

Fig. 8. SiO₂-FeO_T/(FeO_T+MgO)(a), SiO₂-Al₂O₃ (b), (Y+Nb)-Rb(c) and (Yb+Ta)-Rb(d) diagrams of tectonic setting

下载: 全尺寸图片幻灯片

图 9 研究区花岗岩和沉积岩产热率(A)对比

平均上地壳热流值根据Wedepohl(1995)数据计算

Fig. 9. Heat production rate (A) diagram of granite and sedimentary rocks in the study area

下载: 全尺寸图片幻灯片

图 10 惠热一井测温曲线

温度值偏差±0.1℃

Fig. 10. Temperature curve of the No.1 geothermal drill hole of Huizhou

下载: 全尺寸图片幻灯片

表 1 研究区花岗岩放射性生热率

Table 1. Radioactive heat production rate of granite in the study area

黄沙洞工区		石坝工区
样号	A（μW/m³）	样号	A（μW/m³）
Id⁃04	5.81	Id⁃01	4.60
Id⁃05	7.86	Id⁃02	4.94
Id⁃06	2.78	Id⁃03	0.38
Id⁃07	5.41	Id⁃13	7.58
Id⁃08	3.33	Id⁃14	8.64
Id⁃09	7.02	Id⁃17	5.86
Id⁃10	6.17	Id⁃19	2.81
Id⁃11	3.76	Id⁃20	7.66
Id⁃12	2.91	Id⁃21	9.15
Id⁃19	2.81	Id⁃22	4.89
Id⁃20	7.66	Id⁃23	7.13
Id⁃21	9.15	Id⁃24	6.40
Id⁃22	4.89	Id⁃26	7.99
Id⁃23	7.13	Id⁃27	5.85
Id⁃24	6.40	均值	5.99
Id⁃25	5.88
Id⁃27	5.85
Id⁃30	4.24
Id⁃32	5.78
Id⁃33	3.15
Is⁃01	1.85
Is⁃03	1.79
Is⁃05	1.97
均值	4.94

下载: 导出CSV

表 2 研究区花岗岩干热岩地热资源计算参数

Table 2. Calculating parameters of hot dry rock geothermal resources of granite in the study area

参数	黄沙洞工区	石坝工区
花岗岩密度(kg·m^-3)	2.73×10³	2.73×10³
花岗岩比热容(kcal·kg^-1·℃^-1)	0.79	0.79
地下热水密度(kg·m^-3)	1×10³	1×10³
地下水比热容(kcal·kg^-1·℃^-1)	4.2	4.2
花岗岩的孔隙度(%)	0.5	0.5
花岗岩和水的平均温度(℃)	164	164
当地年平均气温(℃)	20	20
隐伏岩体面积(km²)	18×13	22×12
计算厚度(km)	3.5	3.5
Q(kW·h)	8.07×10¹⁴	9.10×10¹⁴

下载: 导出CSV

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