How to create contour for migration of dissolved fluid?
 

Hello,
I am new to ANSYS CFX, but have created a model with 3 layers to represent a saline aquifer, the earth's crust and a region of water. The saline aquifer and earth's crust are porous domains. The saline aquifer has CO2 dissolved in the brine solution within the pores of the porous medium. I want a contour which represents the migration of this CO2. Does anybody have any ideas? Any suggestions would be appreciated!
Thanking you in advance!

I presume the CO2 is a mass fraction equation in water. Then draw a contour of CO2 mass fraction in CFD-Post.

Or are you asking how do you model this simulation?