气候变化领域集成服务门户(CCPortal): Geochemical and Isotopic Characteristics of Two Geothermal Systems at the Nanpu Sag, Northern Bohai Bay Basin

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DOI	10.3389/feart.2022.844605
	Geochemical and Isotopic Characteristics of Two Geothermal Systems at the Nanpu Sag, Northern Bohai Bay Basin
	Wang, Ke; Hua, Cong; Ren, Lu; Kong, Yanlong; Sun, Wenjie; Pan, Sheng; Cheng, Yuanzhi; Huang, Yonghui; Tian, Fei; Zhang, Weizun; Qin, Dajun; Ma, Feng; Wang, Jianwei; Dong, Yuexia
通讯作者	Kong, YL (通讯作者)
发表日期	2022
EISSN	2296-6463
卷号	10
英文摘要	The utilization of geothermal energy has gradually increased in northern China because of its unique advantages as a heating supply. However, the sustainable exploitation of geothermal energy usually requires a comprehensive investigation of the geothermal water circulation pattern prevailing at a proposed site. During the exploitation of geothermal energy resources at Nanpu Sag in northern China, thermal anomalies were found to exist in two adjacent regions: the Caofeidian and the Matouying. To reconcile the anomalies and to examine both the source of recharge water and the geothermal systems' circulation dynamics, a comprehensive investigation was performed using multiple chemical and isotopic tracers (delta H-2, delta O-18, Sr-87/Sr-86, delta C-13, and C-14). The total dissolved solids (TDS) of the geothermal water are approximately 750 mg/L and 1,250 mg/L, respectively. The geothermal water isotopes at the two sites are also different, with average values of -9.3 parts per thousand and -8.2 parts per thousand for delta O-18 and -73.4 parts per thousand and -71 parts per thousand for delta H-2, respectively. Moreover, the Sr-87/Sr-86 ratio of geothermal water at Matouying is 0.7185, which is much greater than that of Caofeidian, with an average value of 0.7088. All the results confirm the difference between the two geothermal systems and may explain the two circulation patterns of deep groundwater at Caofeidian and Matouying. The reservoir temperature obtained from theoretical chemical geothermometers is estimated to be 83-92 degrees C at the Caofeidian and 107-137 degrees C at the Matouying, respectively. The corrected C-14 age implies a low circulation rate that would allow sufficient time to heat the water at Caofeidian. In addition, we propose a geothermal conceptual model in our study area. This model could provide key information regarding the geothermal sustainable exploitation and the effective management of geothermal resources.
关键词	HEAT-FLOW STRONTIUM ISOTOPES CHINA SUSTAINABILITY WATERS ENERGY AREA HYDROGEOCHEMISTRY CIRCULATION RESERVOIRS
英文关键词	hydrothermal energy; geochemical characteristic; isotopic characteristic; two geothermal systems; conceptual model; nanpu sag
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000779408500001
来源期刊	FRONTIERS IN EARTH SCIENCE
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260759
推荐引用方式 GB/T 7714	Wang, Ke,Hua, Cong,Ren, Lu,et al. Geochemical and Isotopic Characteristics of Two Geothermal Systems at the Nanpu Sag, Northern Bohai Bay Basin[J]. 中国科学院青藏高原研究所,2022,10.
APA	Wang, Ke.,Hua, Cong.,Ren, Lu.,Kong, Yanlong.,Sun, Wenjie.,...&Dong, Yuexia.(2022).Geochemical and Isotopic Characteristics of Two Geothermal Systems at the Nanpu Sag, Northern Bohai Bay Basin.FRONTIERS IN EARTH SCIENCE,10.
MLA	Wang, Ke,et al."Geochemical and Isotopic Characteristics of Two Geothermal Systems at the Nanpu Sag, Northern Bohai Bay Basin".FRONTIERS IN EARTH SCIENCE 10(2022).