Our results show that, if we consider a theoretical demonstrator-scale injection at the Ketzin site, the perturbation induced by the CO2 bubble is greater than recorded natural variations. We show that the method is sensible to CO2 bubble cross-sections: a 3D tomography is therefore possible with a carefully placed network. For a CO2 geological storage geology similar to Ketzin, the minimum cross-section that can be detected is 100 000 m2, 500 meters wide if the whole 200m reservoir level is filled.