Geochemical characteristics of the geothermal fluid in the Rongcheng geothermal field, Xiong'an New Area

被引：0

作者：

Zhao J. ^{[1
]}

Zhang W. ^{[1
]}

Ma F. ^{[1
]}

Zhu X. ^{[1
]}

Zhang H. ^{[1
]}

Wang G. ^{[1
]}

机构：

[1] The Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang

来源：

Dizhi Xuebao/Acta Geologica Sinica | 2020年 / 94卷 / 07期

关键词：

Geothermal reservoir temperature; Hydrochemistry type; Hydrogeochemistry; Isotopes;

D O I：

10.19762/j.cnki.dizhixuebao.2020234

中图分类号：

学科分类号：

摘要：

The hydrogeochemical characteristics and evolution of geothermal fluids can reveal the deep circulation mechanism of geothermal water, which is of great significance for the development and utilization of geothermal resources. Based on the geothermal geological conditions of the Rongcheng geothermal field, this paper selects 16 deep geothermal well waters and 2 cold waters in the Baoding mountain area to analyze their hydrochemical characteristics and isotopes, calculate the temperature of thermal reservoir and depth of the thermal cycle. Finally, we undertake reverse hydrogeochemical path simulation to analyze the water rock reaction and migration process of geothermal fluid in the deep. The results show that the hydrochemical type of deep geothermal wells in the study area is of the HCO3•Cl-Na type, and that of Baoding mountain area is of the HCO3-Ca•Mg type. There is no significant positive correlation between Cl and almost all ions in the Rongcheng geothermal field, indicating that trace elements mainly come from the dissolution of related minerals. The high concentration of Na+ in the Rongcheng geothermal field indicates that the groundwater runoff is long and the depth of thermal cycle is large. The content of HBO2 is higher, which means that the runoff of geothermal water is smaller and the velocity is weaker. D and 18O isotopes are basically near the atmospheric precipitation line, and the calculated recharge elevation of geothermal wells is 665.17~1165.17 m, which is close to the altitude of the Baoding mountain area, indicating that the geothermal water sources in the study area are mountain front recharge and atmospheric precipitation. The deep thermal storage temperature is 57~98 ℃, and the depth of thermal cycle is 1331~2483 m. During the progress of the groundwater from the Baoding mountain area to a plain geothermal well, in addition to water rock action, a series of processes such as boiling, evaporation, mixing of cold water and precipitation supplementation have taken place, which makes the ion content of groundwater change greatly. © 2020, Science Press. All right reserved.

引用

页码：1991 / 2001

页数：10

共 34 条

[1] Rui Chai, Hao Wang, Yang Liu, Application of multimineral balance method to estimation of geothermal temperature, Coal Science and Technology, 38, 4, pp. 100-103, (2010)
[2] Liming Chen, Isotopic characteristics analysis of hydrogen-oxygen environment in geothermal water in Fujian Province, Geology of Fujian, 1, pp. 61-68, (2019)
[3] Moxiang Chen, Geothermics of North China, (1988)
[4] Moxiang Cheng, Jiyang Wang, Xiao Deng, Geothermal Resources in China-Formation Characteristics and Potential Evaluation, (1994)
[5] Zhangjun Guo, Hanzhou Song, Chemical components in ground water and its SI values, Resources Environment & Engineering, 19, 3, pp. 200-202, (2005)
[6] Xujuan Lang, Wenjing Lin, Zhiming Liu, Linxiao Xing, Guiling Wang, Hydrochemical characteristics of geothermal water in Guide basin, Earth Science, 41, 10, pp. 1723-1734, (2016)
[7] Jianrong Liu, Xianfang Song, Guofu Yuan, Xiaomin Sun, Xin Liu, Shiqin Wang, Characteristics of δ<sup>18</sup>O in precipitation over Eastern Monsoon China and the water vapor sources, Chinese Sci. Bull, 54, 22, pp. 3521-3531, (2009)
[8] Chang Lu, Ying Li, Zhi Chen, Jiang Yang, A primary study on geochemical characteristics and genesis of geothermal water in the north-central part of the North China downfaulted basin, Bulletin of Mineralogy, Petrology and Geochemistry, 37, 4, (2018)
[9] Can Lu, Characteristics and genetic mechanism of geothermal system in the geothermal field of Niutuo Town, Ground Water, 40, 3, pp. 28-30, (2018)
[10] Zhiyuan Ma, Xingang Wang, Yan Su, Juan Yu, Oxygen and hydrogen isotope exchange and its controlling factors in subsurface geothermal waters in the central Guanzhong basin, Shaanxi, China, Geological Bulletin of China, 27, 6, pp. 888-894, (2008)

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