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

doi:10.1051/e3sconf/20199808001

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

^*Corresponding author for this work

Civil And Environmental Engineering

Research output: Contribution to journal › Conference article › peer-review

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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 language	English
Article number	08001
Number of pages	5
Journal	E3S Web of Conferences
Volume	98
DOIs	https://doi.org/10.1051/e3sconf/20199808001
Publication status	Published - 7 Jun 2019
Event	16th 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 2019 → 26 Jul 2019

Keywords

geothermal borehole
granite
mixing tank model
resident groundwater
injected surface water

Access to Document

10.1051/e3sconf/20199808001Licence: CC BY 4.0

Banks-etal-E3S-2019-Exponential-trends-in-flowback-chemistry-from-a-hydraulically-stimulated-deep-geothermal-borehole-in-graniteFinal published version, 670 KBLicence: CC BY 4.0

DESTRESS: Demonstration of soft stimulation treatments of geothermal reservoirs
Burnside, N.
1/03/16 → 1/05/21
Project: Projects from Previous Employment

Cite this

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

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).",

keywords = "geothermal borehole, granite, mixing tank model, resident groundwater, injected surface water",

author = "David Banks and Neil Burnside and Rob Westaway and G{\"u}nter Zimmermann and Hannes Hofmann",

year = "2019",

month = jun,

day = "7",

doi = "10.1051/e3sconf/20199808001",

language = "English",

volume = "98",

journal = "E3S Web of Conferences",

issn = "2555-0403",

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note = "16th International Symposium on Water-Rock Interaction, WRI 2019 and 13th International Symposium on Applied Isotope Geochemistry, 1st IAGC International Conference ; Conference date: 21-07-2019 Through 26-07-2019",

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TY - JOUR

T1 - Exponential trends in flowback chemistry from a hydraulically stimulated deep geothermal borehole in granite; Pohang, South Korea

AU - Banks, David

AU - Burnside, Neil

AU - Westaway, Rob

AU - Zimmermann, Günter

AU - Hofmann, Hannes

PY - 2019/6/7

Y1 - 2019/6/7

N2 - 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).

AB - 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).

KW - geothermal borehole

KW - granite

KW - mixing tank model

KW - resident groundwater

KW - injected surface water

U2 - 10.1051/e3sconf/20199808001

DO - 10.1051/e3sconf/20199808001

M3 - Conference article

AN - SCOPUS:85067284872

SN - 2555-0403

VL - 98

JO - E3S Web of Conferences

JF - E3S Web of Conferences

M1 - 08001

T2 - 16th International Symposium on Water-Rock Interaction, WRI 2019 and 13th International Symposium on Applied Isotope Geochemistry, 1st IAGC International Conference

Y2 - 21 July 2019 through 26 July 2019

ER -

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

Abstract

Keywords

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Projects

DESTRESS: Demonstration of soft stimulation treatments of geothermal reservoirs

Cite this