The understanding of the Paleogene Dongying formation and the Jixianian Wumishan formation have been gradually deepened with the exploration and development of deep thermal reservoirs in the Binhai New Area.This paper analyzes the hydrochemical characteristics, reservoir temperature, and hydrogeochemical effects of the geothermal fluid of the Dongying and Wumishan formations, thus providing bases for the further development and utilization of deep geothermal resources. The Wumishan formation in the Ninghe salient is adequately recharged. In contrast,the Dongying formation occursin a relatively closed environment, and the geothermal fluid in it is at a state of chemical equilibrium. The average temperature of the geothermal reservoirs in the Wumishan and Dongying formation scalculated using geothermometers is about 126 ℃ and 100 ℃, respectively. The geothermal fluid in both formations originates from atmospheric precipitation. Compared to the Wumishan formation, the geothermal fluidin the Dongying formation exchanges heat with rocks for a longer time and has a weaker cycling capacity. The runoff direction of the geothermal fluid in the formations is from northeast to southwest, with leaching, cation exchange, precipitation,and mixing mainly occurring during the fluid runoff.
石晓今, 李嫄嫄, 黄贤龙. 天津滨海新区深部地热流体水文地球化学特征[J]. 物探与化探, 2022, 46(2): 316-322.
SHI Xiao-Jin, LI Yuan-Yuan, HUANG Xian-Long. Hydrogeochemical characteristics of deep geothermal fluids in the Binhai New Area, Tianjin City. Geophysical and Geochemical Exploration, 2022, 46(2): 316-322.
Li W L, Huang X L, Zhang L D, et al. Analysis of geothermal geological conditions and thermal storage characteristics in Tianjin Binhai New Area[J]. China Water Transport, 2014, 14(11):280-282
Ruan C X, Yu Y, Gao B Z, et al. Hydrochemical characteristics analysis of geothermal fluids in Tianjin Binhai New Area[J]. Groundwater. 2010, 2(1):51-53.
Zhao P, Xie E J, Duo J, et al. Geochemical characteristics of geothermal gases and geological significance in Tibet[J]. Acta Petrologica Sinica, 2002, 18(4):539-550.
Liu Z, Lin W J, Zhang M, et al. Genesis of Nimu-Nagqu geothermal fluids in Tibet and contribution of mantle-derived fluids[J]. Geoscience Frontier, 2014, 21(6): 366-367.
Wang Y, Zhou X, Yu D, et al. Estimation of storage temperature of underground thermal using geothermal temperature scale[J]. Geoscience, 2007, 21(4):606-612.
Song X Q, Duan Q B, Meng F T, et al. Geological genesis analysis of Xifeng hot spring in Guizhou[J]. Geological Science and Technology Information, 2014, 33(5):216-220.
Yuan J F, Deng G S, Xu F, et al. Hydrogeochemical characteristics of groundwater in Xide hot field in southwestern Sichuan[J]. Geoscience, 2017, 31(1): 200-208.
Ma Z M, He J T, Zhang X M. Hydrogeochemical characteristics and genesis analysis of underground hot water in Heze uplift[J]. Shandong Geology, 2000, 16(2):24-30.
Zhang B J. Analysis of hydrogeochemical characteristics and formation conditions of underground hot water in northwestern Shandong[D]. Beijing: China University of Geosciences, 2011.
Lin L, Gao B Z, Ruan C X, et al. National geothermal resources research evaluation and division- Research, evaluation and division of geothermal resources in Tianjin[R]. Tianjin:Tianjin Geothermal Exploration and Development-Designing Institute, 2014.
Wang X. Formation conditions and hydrogeochemical characteristics of the geothermal water system in the typical deep and large fault zone along the coast of Guangdong[D]. Wuhan: China University of Geosciences, 2018.
[13]
孙红丽. 关中盆地地热资源赋存特征及成因模式研究[D]. 北京: 中国地质大学, 2015.
[13]
Sun H L. Study on the occurrence characteristics and genetic model of geothermal resources in the Guanzhong Basin[D]. Beijing: China University of Geosciences, 2015.
Cheng W Q, Tang Yong X. Investigation and evaluation report of deep geothermal resources in Binhai New Area[R]. Tianjin:Tianjin Geothermal Exploration and Development-Designing Institute, 2017.