Quantitative measurements of partial saturations in Brine-CO₂ Saturated Rocks at pore scale (QUASAR)

Predicting saturation effects on the seismic response requires a fundamental understanding of how attenuation and velocities are affected by fluid distributions. Seismic quantitative interpretation of CO₂ monitoring data can be largely flawed if such mesoscopic phenomena are not considered, both for amplitude-based methods (due to attenuation) and waveform-based methods (due to attenuation and dispersion). The correct quantification of saturation and pore pressure levels requires good understanding of the relationship between fluid distribution and physical properties. This work presents preliminary results on a technique for establishing the relationships by core studies based on acoustic measurements in the ultrasound scale on CO₂-brine saturated rocks. The experimental setup makes it possible to simultaneously measure both acoustic response of the saturated rock and visualise the rock, its microstructure, and the fluid distribution at pore scale under µCT scanner.