Kirkoff Xn Posted May 7, 2022 Share Posted May 7, 2022 Hi When modeling injection of fluid A (oxidizing) into an aquifer having fluid B using flash model, I am a bit confused seeing the results yielded. The native groundwater has high TDS while the injectate is a freshwater. When plotting mineral saturation versus mixing ratio, there is a pattern of mineral saturation decrease with calcite dissolution (more likely)[I assume it's quite sound geochemically]. However, when plotting components in fluids that would define mineral stability being seen, I find some inconsistency. I have high Cl- concentration at 0% mixing fraction, implying that Cl- concentration is higher in the injectate water than in the native groundwater—which is not the case! Part of what I am trying to demonstrate is how groundwater get refreshed, and the hydrochemical facies evolution being seen in piper diagram can be backed up by the mixing using "flash model". Also, evaporites (gypsum and anhydrite) are more likely to increase with mixing ratio since the mixing ratio increases towards the native groundwater. In GSS file, It is possible to know the saturation index of minerals and these two minerals have high SI in the native groundwater than in the surface freshwater. Also, if I mix 50% fluid A with 50% fluid B in GSS (analysis > mix sample >mix by volume), I am wondering if the results yielded is the same as at 0.5 mixing fraction in react. Attached, you'll find both the GSS & react files. Thank you Quote Link to comment Share on other sites More sharing options...
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