Exponential trends in flowback chemistry from a hydraulically stimulated deep 
geothermal borehole in granite; Pohang, South Korea

Banks, David; Burnside, Neil; Westaway, Rob; Zimmermann, G.; Hofmann, Hannes

doi:10.1051/e3sconf/20199808001

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Exponential trends in flowback chemistry from a hydraulically stimulated deep geothermal borehole in granite; Pohang, South Korea

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Banks, David
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Burnside, Neil
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Westaway, Rob
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Zimmermann, G.
4.8 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Hofmann, Hannes
4.8 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Banks, D., Burnside, N., Westaway, R., Zimmermann, G., Hofmann, H. (2019): Exponential trends in flowback chemistry from a hydraulically stimulated deep geothermal borehole in granite; Pohang, South Korea. - E3S Web of Conferences, 98, 08001.
https://doi.org/10.1051/e3sconf/20199808001

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_4539902

Abstract

Samples of flowback water from a 4.3 km deep geothermal borehole in granite (Pohang, South Korea) were collected following a period of hydraulic stimulation by injection of surface water. Electrical conductivity, temperature and water chemistry of the flowback water were measured. To a first approximation, the data conform closely to a simple ‘mixing tank’ model, with an exponential trend between two end members: an initial injected surface water to a more brackish ‘resident groundwater’ composition. Significant deviation from the ‘mixing tank’ trend would be an indication of significant recent water-rock interaction or other anomalous factors. Such a deviation can tentatively be seen in Na+/Cl- data, especially between 88 and 200 m3 flowback (2.8 to 8.8 hr).