Hydrogeochemistry And Reservoir Model Of Fuzhou Geothermal Field, China

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Journal Article: Hydrogeochemistry And Reservoir Model Of Fuzhou Geothermal Field, China

Abstract
Fuzhou geothermal field is a low- to intermediate-temperature geothermal system consisting of meteoric water that circulates deeply along faults. The area of the field is about 9 km2 but it is elongated in a NNW-trending direction. Fluids in the field are controlled by a series of four NNW extensional faults in Cretaceous granitic basement (Fuzhou fault zone). These faults feed warm waters into overlying permeable Quaternary sediments. The hydrothermal system consists of north and south parts whose chemical compositions are subtly different. In the northern part the system discharges sulfate/chloride waters with relatively low chloride concentrations, but in the south the system discharges chloride waters having relatively high chloride concentrations. Maximum wellhead temperatures are 97°C, which agrees with the chalcedony geothermometer in many cases. Based on the solubility of quartz, the deep-reservoir temperature cannot exceed 123 to 131°C. From heat and mass balance calculations, we conclude that the present total extracted capacity of fluid from the reservoir (20,000 tons/day) could be doubled without noticeable drawdown. We estimate the recoverable heat in the reservoir to be about 1.71 _ 1011 MJ.

Authors 
H. F. Huang and Fraser Goff








Published Journal 
Journal of Volcanology and Geothermal Research, 1986





DOI 
Not Provided
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Citation

H. F. Huang,Fraser Goff. 1986. Hydrogeochemistry And Reservoir Model Of Fuzhou Geothermal Field, China. Journal of Volcanology and Geothermal Research. (!) .