Two equations of state assembled for basic analysis of multiphase CO2 flow and in deep sedimentary basin conditions

Brian J.O.L. McPherson, Weon Shik Han, Barret S. Cole

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


The purpose of the study presented in this manuscript is to describe and make available two equation-of-state (EOS) algorithms assembled for multiphase flow and transport of carbon dioxide (CO2). The algorithms presented here calculate solubility, compressibility factor, density, viscosity, fugacity, and enthalpy of CO2 in gaseous and supercritical phases, and mixtures or solutions of CO2 in water, as functions of pressure and temperature. Several features distinguish the two algorithms, but the primary distinction concerns treatment of supercritical/gas-phase CO2: one EOS we assembled is based on Redlich and Kwong's original algorithm developed in 1949, and the other is based on an algorithm developed by Span and Wagner in 1996. Both were modified for application to sedimentary basin studies of multiphase CO2 flow processes, including carbon sequestration applications. We present a brief comparison of these two EOS algorithms. Source codes for both algorithms are provided, including "stand-alone" Matlab

Original languageEnglish
Pages (from-to)427-444
Number of pages18
JournalComputers and Geosciences
Issue number5
Publication statusPublished - 2008 May

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Computers in Earth Sciences


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