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Interaction of super-critical CO2 with mudrocks: Impact on composition and mechanical properties.

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Title: Interaction of super-critical CO2 with mudrocks: Impact on composition and mechanical properties.
Authors: Dewhurst, David N.1 (AUTHOR) david.dewhurst@csiro.au, Raven, Mark D.2 (AUTHOR), Shah, Sahriza Salwani Bt Md3 (AUTHOR), Ali, Siti Syareena Bt Md3 (AUTHOR), Giwelli, Ausama1 (AUTHOR), Firns, Stephen1 (AUTHOR), Josh, Matthew1 (AUTHOR), White, Cameron1 (AUTHOR)
Source: International Journal of Greenhouse Gas Control. Nov2020, Vol. 102, pN.PAG-N.PAG. 1p.
Subject Terms: *Geological carbon sequestration, *Carbon dioxide, *Geochemistry, Impact (Mechanics), Strains & stresses (Mechanics), Analytical geochemistry, Supercritical carbon dioxide
Abstract: • Geomechanical, mineralogical and geochemical analysis of mudrocks exposed to sCO 2 at high temperature and pressure. • No changes in mineralogy or major element geochemistry noted. • Mudrocks noted to both strengthen and stiffen after exposure to sCO 2 for six months. • Loss of water results in a complete change in geomechanical behaviour from ductile to brittle. Geological storage of carbon dioxide (CO 2) is a long-discussed strategy for avoiding CO 2 discharge into the atmosphere and a few industrial scale projects are underway in this regard. In order to successfully perform such a strategy, it is important that site evaluation takes into account both reservoir and caprock properties in order to trap the CO 2. Many caprocks for such sites are clay-rich mudrocks, hence evaluating their seal capacity and seal integrity are critical for storage sites. Analytical studies on the impact of potential CO 2 -water-rock interaction are an important part of site evaluation since potential geochemical reactions may degrade the seal quality and effectiveness. This paper investigates the impact of static exposure of mudrock seals to super-critical CO 2 (sCO 2) at high temperature and pressure (150˚C, 29 MPa) on the mineralogy (illite-smectite, kaolinite, illite and quartz), major element geochemistry and geomechanical properties of mudrock seals over a six-month period. Mineralogy and geochemistry were determined stepwise from their preserved initial state and after 1, 4 and 6 months exposure to sCO 2 in a batch reactor, with no detectable changes in any of the minerals or elements observed. This is likely due to low reactivity in silicate systems and low volume of pore fluid available to facilitate chemical reactions. Samples for geomechanical testing were exposed to sCO 2 for 6 months only. Geomechanical properties changed significantly between preserved and sCO 2 exposed samples tested under equivalent effective stress conditions, with sCO 2 exposed samples being much stronger and stiffer than their preserved counterparts. Given that no mineralogical and geochemical changes were noted during exposure to sCO 2 , it is most likely that the loss of pore water during sCO 2 exposure resulted in the strengthening and stiffening of these mudrocks. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Greenhouse Gas Control is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Interaction of super-critical CO2 with mudrocks: Impact on composition and mechanical properties.
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  Data: <searchLink fieldCode="AR" term="%22Dewhurst%2C+David+N%2E%22">Dewhurst, David N.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> david.dewhurst@csiro.au</i><br /><searchLink fieldCode="AR" term="%22Raven%2C+Mark+D%2E%22">Raven, Mark D.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Shah%2C+Sahriza+Salwani+Bt+Md%22">Shah, Sahriza Salwani Bt Md</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ali%2C+Siti+Syareena+Bt+Md%22">Ali, Siti Syareena Bt Md</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Giwelli%2C+Ausama%22">Giwelli, Ausama</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Firns%2C+Stephen%22">Firns, Stephen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Josh%2C+Matthew%22">Josh, Matthew</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22White%2C+Cameron%22">White, Cameron</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Greenhouse+Gas+Control%22">International Journal of Greenhouse Gas Control</searchLink>. Nov2020, Vol. 102, pN.PAG-N.PAG. 1p.
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  Data: *<searchLink fieldCode="DE" term="%22Geological+carbon+sequestration%22">Geological carbon sequestration</searchLink><br />*<searchLink fieldCode="DE" term="%22Carbon+dioxide%22">Carbon dioxide</searchLink><br />*<searchLink fieldCode="DE" term="%22Geochemistry%22">Geochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Impact+%28Mechanics%29%22">Impact (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+geochemistry%22">Analytical geochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Supercritical+carbon+dioxide%22">Supercritical carbon dioxide</searchLink>
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  Label: Abstract
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  Data: • Geomechanical, mineralogical and geochemical analysis of mudrocks exposed to sCO 2 at high temperature and pressure. • No changes in mineralogy or major element geochemistry noted. • Mudrocks noted to both strengthen and stiffen after exposure to sCO 2 for six months. • Loss of water results in a complete change in geomechanical behaviour from ductile to brittle. Geological storage of carbon dioxide (CO 2) is a long-discussed strategy for avoiding CO 2 discharge into the atmosphere and a few industrial scale projects are underway in this regard. In order to successfully perform such a strategy, it is important that site evaluation takes into account both reservoir and caprock properties in order to trap the CO 2. Many caprocks for such sites are clay-rich mudrocks, hence evaluating their seal capacity and seal integrity are critical for storage sites. Analytical studies on the impact of potential CO 2 -water-rock interaction are an important part of site evaluation since potential geochemical reactions may degrade the seal quality and effectiveness. This paper investigates the impact of static exposure of mudrock seals to super-critical CO 2 (sCO 2) at high temperature and pressure (150˚C, 29 MPa) on the mineralogy (illite-smectite, kaolinite, illite and quartz), major element geochemistry and geomechanical properties of mudrock seals over a six-month period. Mineralogy and geochemistry were determined stepwise from their preserved initial state and after 1, 4 and 6 months exposure to sCO 2 in a batch reactor, with no detectable changes in any of the minerals or elements observed. This is likely due to low reactivity in silicate systems and low volume of pore fluid available to facilitate chemical reactions. Samples for geomechanical testing were exposed to sCO 2 for 6 months only. Geomechanical properties changed significantly between preserved and sCO 2 exposed samples tested under equivalent effective stress conditions, with sCO 2 exposed samples being much stronger and stiffer than their preserved counterparts. Given that no mineralogical and geochemical changes were noted during exposure to sCO 2 , it is most likely that the loss of pore water during sCO 2 exposure resulted in the strengthening and stiffening of these mudrocks. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Greenhouse Gas Control is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.ijggc.2020.103163
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Geological carbon sequestration
        Type: general
      – SubjectFull: Carbon dioxide
        Type: general
      – SubjectFull: Geochemistry
        Type: general
      – SubjectFull: Impact (Mechanics)
        Type: general
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
      – SubjectFull: Analytical geochemistry
        Type: general
      – SubjectFull: Supercritical carbon dioxide
        Type: general
    Titles:
      – TitleFull: Interaction of super-critical CO2 with mudrocks: Impact on composition and mechanical properties.
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            NameFull: Dewhurst, David N.
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            NameFull: Raven, Mark D.
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            NameFull: Shah, Sahriza Salwani Bt Md
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            NameFull: Ali, Siti Syareena Bt Md
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              Text: Nov2020
              Type: published
              Y: 2020
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            – TitleFull: International Journal of Greenhouse Gas Control
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