Choose SO4−− for the x-axis, then swap in a fugacity ratio.

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Presentation transcript:

Choose SO4−− for the x-axis, then swap in a fugacity ratio. Choose Ca++ as the main species to diagram, then swap in mineral Calcite. Choose SO4−− for the x-axis, then swap in a fugacity ratio.

Choose H2S(g) for the numerator, and CH4(g) for the denominator.

Run → Go draws the diagram Choose an appropriate range of values for the H2S(g)/CH4(g) fugacity ratio. Run → Go draws the diagram

CH4(g) + Anhydrite ↔ Calcite + H2O + H2S(g) Equilibrium point of the methane souring reaction, calculated as a function of temperature. CH4(g) + Anhydrite ↔ Calcite + H2O + H2S(g)