4D Seismic Modelling Applied to CO2 Leak Detection : 3D Case Study - Part B

When injecting CO2 in a reservoir interval, one of the main risk to monitor is the possibility of a leak into an upper reservoir interval through a fault or a legacy well. This study presents a 3D seismic modelling of a CO2 plume in the main reservoir and the associated leak computed using a fully coupled reservoir-geomechanics simulation. The modelling is performed using a 30Hz and a 60Hz wavelet and filters are applied to mimic the resulting detectable seismic signal using different acquisition devices. The leak geometry and physical characteristics are also studied to create guidelines on the key parameters accounting for its detectability.