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Quantification of solubility trapping in natural and engineered CO2 reservoirs

View ORCID ProfileRory Leslie, Andrew J. Cavanagh, View ORCID ProfileR. Stuart Haszeldine, View ORCID ProfileGareth Johnson and View ORCID ProfileStuart M. V. Gilfillan
Petroleum Geoscience, 27, petgeo2020-120, 26 July 2021, https://doi.org/10.1144/petgeo2020-120
Rory Leslie
1School of GeoSciences, Grant Institute, University of Edinburgh, Edinburgh EH9 3FE, UK
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  • ORCID record for Rory Leslie
  • For correspondence: [email protected]
Andrew J. Cavanagh
1School of GeoSciences, Grant Institute, University of Edinburgh, Edinburgh EH9 3FE, UK
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R. Stuart Haszeldine
1School of GeoSciences, Grant Institute, University of Edinburgh, Edinburgh EH9 3FE, UK
2SCCS, High School Yards, Infirmary Street, Edinburgh EH1 1LZ, UK
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Gareth Johnson
3Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow G1 1XZ, UK
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Stuart M. V. Gilfillan
1School of GeoSciences, Grant Institute, University of Edinburgh, Edinburgh EH9 3FE, UK
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  • ORCID record for Stuart M. V. Gilfillan
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Abstract

Secure retention of CO2 in geological reservoirs is essential for effective storage. Solubility trapping, the dissolution of CO2 into formation water, is a major sink on geological timescales in natural CO2 reservoirs. Observations during CO2 injection, combined with models of CO2 reservoirs, indicate the immediate onset of solubility trapping. There is uncertainty regarding the evolution of dissolution rates between the observable engineered timescale of years and decades, and the >10 kyr state represented by natural CO2 reservoirs. A small number of studies have constrained dissolution rates within natural analogues. The studies show that solubility trapping is the principal storage mechanism after structural trapping, removing 10–50% of CO2 across whole reservoirs. Natural analogues, engineered reservoirs and model studies produce a wide range of estimates on the fraction of CO2 dissolved and the dissolution rate. Analogue and engineered reservoirs do not show the high fractions of dissolved CO2 seen in several models. Evidence from natural analogues supports a model of most dissolution occurring during emplacement and migration, before the establishment of a stable gas–water contact. A rapid decline in CO2 dissolution rate over time suggests that analogue reservoirs are in dissolution equilibrium for most of the CO2 residence time.

Supplementary material: Dissolution rate for all plots and exponential function curves for scenarios A and B are available at https://doi.org/10.6084/m9.figshare.c.5476199

Thematic collection: This article is part of the Geoscience for CO2 storage collection available at: https://www.lyellcollection.org/cc/geoscience-for-co2-storage

  • © 2021 The Author(s). Published by The Geological Society of London for GSL and EAGE. All rights reserved
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Petroleum Geoscience: 27 (4)
Petroleum Geoscience
Volume 27, Issue 4
November 2021
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Quantification of solubility trapping in natural and engineered CO2 reservoirs

Rory Leslie, Andrew J. Cavanagh, R. Stuart Haszeldine, Gareth Johnson and Stuart M. V. Gilfillan
Petroleum Geoscience, 27, petgeo2020-120, 26 July 2021, https://doi.org/10.1144/petgeo2020-120
Rory Leslie
1School of GeoSciences, Grant Institute, University of Edinburgh, Edinburgh EH9 3FE, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Rory Leslie
  • For correspondence: [email protected]
Andrew J. Cavanagh
1School of GeoSciences, Grant Institute, University of Edinburgh, Edinburgh EH9 3FE, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
R. Stuart Haszeldine
1School of GeoSciences, Grant Institute, University of Edinburgh, Edinburgh EH9 3FE, UK
2SCCS, High School Yards, Infirmary Street, Edinburgh EH1 1LZ, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for R. Stuart Haszeldine
Gareth Johnson
3Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow G1 1XZ, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Gareth Johnson
Stuart M. V. Gilfillan
1School of GeoSciences, Grant Institute, University of Edinburgh, Edinburgh EH9 3FE, UK
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  • ORCID record for Stuart M. V. Gilfillan

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Quantification of solubility trapping in natural and engineered CO2 reservoirs

Rory Leslie, Andrew J. Cavanagh, R. Stuart Haszeldine, Gareth Johnson and Stuart M. V. Gilfillan
Petroleum Geoscience, 27, petgeo2020-120, 26 July 2021, https://doi.org/10.1144/petgeo2020-120
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    • Abstract
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