CO2 solubility measurements in brine under reservoir conditions: A comparison of experimental and geochemical modeling methods

Luc Steel*, Qi Liu, Eric Mackay, M Mercedes Maroto-Valer

*Corresponding author for this work

Research output: Contribution to journalLiterature reviewpeer-review

33 Citations (Scopus)
7282 Downloads (Pure)


The dissolution of CO2 in brine (solubility trapping) is one of the most secure and permanent trapping mechanisms when considering CO2 geological storage. In addition, CO2 dissolution in brine is an important mechanism of CO2 enhanced oil recovery as it improves sweep efficiency and increases oil displacement. Currently, there is a range of experimental methods that has been used to measure CO2 solubility in brine and a critical review of these methods is presented here. Several different geochemical models that can be used to calculate CO2 solubility in brine are also reviewed and the importance of selecting the correct equation of state (EoS) is addressed. Furthermore, the validity of the experimental results was ascertained through a comparison of the published experimental results with those produced through geochemical modeling. The geochemical modeling software, HydraFLASH, can be used to accurately calculate CO2 solubilities under a number of conditions provided the correct EoS is selected. For the purpose of CO2-water systems, the Valderrama-Patel-Teja EoS is the most accurate as it is designed to be used for systems containing polar and non-polar compounds. The published experimental results were compared with those obtained through the geochemical modeling, to ascertain the most accurate means of measuring CO2 solubility.

Original languageEnglish
Pages (from-to)197-217
Number of pages21
JournalGreenhouse Gases: Science and Technology
Issue number2
Early online date17 Feb 2016
Publication statusPublished - Apr 2016


  • CO2 enhanced oil recovery
  • CO2 geological storage
  • CO2 solubility
  • geochemical modeling
  • 10 MPA
  • NACL

ASJC Scopus subject areas

  • Environmental Chemistry
  • Environmental Engineering


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