PHAST: Dissolved oxygen at an observation well

[Yonas]

Hi all,

I am using PHAST to simulate ASR cycle tests and wanted to compare DO at an observation well with concentrations measured at the well head.

The PHAST output file, prefix.wel.xyz, gives component concentrations at an observation well (H, O, Cl etc). Is there a way to explicitly output dissolved oxygen (DO) to this file? Estimating DO from total O -(HCO3, SO4,...) would require knowing all the solutes and I am not sure if this is the correct way.

DO for selected nodes can be written to the prefix.chem.xyz using SELECTED_OUTPUT. However, I am interested in DO at the well datum (top of open interval) with weighted contribution from the production zones. What would be the best way to handle this problem?

Thank you.

[dlparkhurst]

I think there is not an easy way to get the concentration of DO. However, we are coming out with a new version of PHAST, and I will at least add pe to the well xyz output file. With that and pH it is possible to calculate DO.

[Yonas]

Thank you very much. Looking forward to the new version of PHAST.