Exponential Trends in Flowback Chemistry From a Hydraulically Stimulated Deep Geothermal Borehole in Granite; Pohang, South Korea

Banks, D. , Burnside, N. , Westaway, R., Zimmermann, G. and Hofmann, H. (2019) Exponential Trends in Flowback Chemistry From a Hydraulically Stimulated Deep Geothermal Borehole in Granite; Pohang, South Korea. In: 16th International Symposium on Water-Rock Interaction and 13th International Symposium on Applied Isotope Geochemistry (1st IAGC International Conference), Tomsk, Russia, 21-26 Jul 2019, (doi:10.1051/e3sconf/20199808001)

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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).

Item Type:Conference Proceedings
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Burnside, Dr Neil and Banks, Mr David and Westaway, Dr Robert
Authors: Banks, D., Burnside, N., Westaway, R., Zimmermann, G., and Hofmann, H.
Subjects:Q Science > QD Chemistry
Q Science > QE Geology
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Published Online:07 June 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in E3S Web of Conferences 98:08001
Publisher Policy:Reproduced under a Creative Commons license
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
704811DESTRESSNeil BurnsideEuropean Commission (EC)691728ENG - ENGINEERING SYSTEMS POWER & ENERGY