We present a two-step inversion workflow for quantitative CO₂ monitoring. In the first inversion step, we carry out CSEM inversion and seismic FWI with uncertainty assessment. The uncertainty is propagated in the second step (rock physics inversion) using a Bayesian formulation. We show sensitivity ...

Depletion or injection into a reservoir implies stress and strain changes in the reservoir and its surroundings. This may lead to measurable time-shifts for seismic waves propagating in the subsurface. We have measured multidirectional ultrasonic P-wave velocity changes for three different field sha...

Depletion or injection into a reservoir implies stress and strain changes in the reservoir and its surroundings. This may lead to measurable time-shifts for seismic waves propagating in the subsurface. We have measured multi-directional ultrasonic P-wave velocity changes for three different field sh...

Seismic monitoring of CO₂ storage is mainly sensitive fluid saturation changes in the reservoir. We combine electromagnetic and seismic data to image CO₂ saturation and its distribution type at the Sleipner field. We find that the simultaneous joint inversion reduces uncertainty in recovering fluid ...