what is the difference between the MPHASE and SCO2 modes

[chenyao su]

Hi all,

  I noticed that the governing equations of MPHASE and SCO2 in PFLOTRAN look almost identical in the documentation, with SCO2 mainly adding salt.
However, SCO2 is strongly recommended for CO₂ sequestration.
Could someone explain the key differences in physical assumptions, EOS/phase equilibrium treatment, interphase mass transfer, and numerical formulation that make SCO2 fundamentally different from MPHASE, beyond what is visible in the equations? 

Thanks very much for your time and help!

Best regards

[Michael Nole]

Mostly SCO2 mode is newer, is compatible with the well model, and is the flow mode that was used in the recent SPE 11 code comparison. 

You can find all the details on EOS's, numerics, and usage here:

Michael

On Jan 15, 2026, at 7:57 PM, chenyao su <suche...@gmail.com> wrote:



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