Fig. 6: Stable carbon isotope ratio (δ13CDIC) of dissolved inorganic carbon.

Relationship between δ13CDIC and DIC concentration in collected fluid samples after the incubation period of 45 days. Calculated values are the predicted concentrations and carbon isotopic composition based on non-reactive mixing (see Eq. (5)). The predicted values plot along a mixing hyperbola between the injected solution and the background reservoir fluid.