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

David Banks, Neil Burnside, Rob Westaway, Günter Zimmermann, Hannes Hofmann

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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).

Original languageEnglish
Article number08001
Number of pages5
JournalE3S Web of Conferences
Volume98
DOIs
Publication statusPublished - 7 Jun 2019
Event16th International Symposium on Water-Rock Interaction, WRI 2019 and 13th International Symposium on Applied Isotope Geochemistry, 1st IAGC International Conference - Tomsk, Russian Federation
Duration: 21 Jul 201926 Jul 2019

Keywords

  • geothermal borehole
  • granite
  • mixing tank model
  • resident groundwater
  • injected surface water

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