Mojo Posted December 15, 2021 Share Posted December 15, 2021 Hi All, I am running a a React model for studying CO2-brine-rock reactions. I increased the CO2 pressure linearly to my desired number in 2 days and I used the model outcomes for running a new model under constant CO2 pressure from 2 days to 20 yrs. The 20 yrs model has not converged even after 3 days running! I have run parallel models for which I tuned the time step and even put Siderite and Anorthite (the most reactive minerals in the model) at equilibrium condition to help the model converge faster, but it was un-effective. Non of the 20 yrs models converge yet and they are still going on.... Any idea why is that? I am using the most recent version of GWB (2021). Not sure what causes this issue. I faced this issue once in the past when I had Calcite (highly reactive mineral) in my model. And I found that I need to set Calcite in equilibrium so the model that can converge in a few mins. But as I said this trick did not work this time. Attached are both 2 days and 20 yrs models. Also, I wonder why the calculated porosity change in 2 days model is wrong. When I calculate the porosity using the minerals volumes data, and a fix bulk volume (initial bulk volume value), i end up to a different number. It seems bulk volume is changing in the model in each time step. Thanks Seyed 20 yrs injection.rea 2 days injection.rea Quote Link to comment Share on other sites More sharing options...
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