SEM images of labradorite sands before and after fluid injection experiments

Scanning electron microscope (SEM) images of labradorite sands before and after fluid injection experiments. Images were acquired using an FEI Quanta 600 Environmental Scanning Electron Microscope with a backscattered electron detector (BSE). Figure 3a shows original labradorite sands prior to fluid injection, Figure 3b shows labradorite sands after brine injection under high-pressure conditions, and Figure 3c shows labradorite sands after CO2-brine injection under high-pressure conditions. The bright contrast observed in Figure 3c is attributed to surface coating and charging effects during SEM imaging.