Title:

Integrate Monitoring Data and Geochemical Modeling Construct Carbonate Precipitation of Tuchang Geothermal Area, Taiwan

Authors:

Chia-Mei LIU, Shih-Ting CHOU, Chun-Fa HUANG, Ke-Han SONG

Key Words:

monitoring, geochemical modeling, carbonate precipitation, Tuchang Geothermal area, Taiwan

Conference:

Stanford Geothermal Workshop

Year:

2023

Session:

Geochemistry

Language:

English

Paper Number:

Liu2

File Size:

902 KB

View File:

Abstract:

In Taiwan, there are a lot of hot springs distribution on the low-grade metamorphic rock, and has a geothermal power plant setting in the Chingshui Geothermal Field, which consists on slate and meta-sandstone. The carbonate scaling is always a big issue, which causes geothermal power plant of Chingshui Geothermal Field stop at 1993 and restart the geothermal power plant at 2021. The pilot geothermal power plant, which was 260kWe ever set up at Tuchang area. That area is Tuchang River catchment and has raining record station which is located on the upper stream. The whole river catchment has three types of thermal water which one type is artesian from 2,200 m depth; another is geyser that belongs artificial borehole, which depth is less than 1,000 m; and the one is artesian from outcrop. This study collected samples including rain, surface water and thermal water between 201808 and 202007. The preliminary results shown that borehole artesian and artificial geyser are Na-HCO3, and outcrop artesian is Ca-HCO3 based on the monitoring data. The concentrations of sodium, potassium of borehole artesian and artificial geyser are achievement 1,000 ppm and 20 ppm, respectively, however, the outcrop artesian only is about 200 ppm and 9 ppm. In addition, the concentration of calcium of outcrop artesian is about 100 ppm, the borehole artesian and artificial geyser are less than 1 ppm. This study infers to The outcrop artesian is in the geothermal reservoir of shallow depth and enriches calcium. The artesian of well and geyser locates in the geothermal reservoir of deeper depth and has enriched sodium and potassium. Finally, this study points out that the pressure would be controlled which could reduce carbonate precipitation in Tuchang Geothermal area of Taiwan.


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