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We present an integrated approach combining Full-Waveform Inversion and rock physics inversion to estimate CO₂ saturation at Sleipner. Acoustic FWI provides high-resolution P-wave velocity images where the uncertainty is quantified using posterior covariance matrix analysis. The seismic properties...

Oilfield wellbore integrity relies on a good well cement formulation, placement, and resistance to solicitations when aging, either due to chemical or stress changes. Requirements are that the cement sheath and plugs remain as proper hydraulic barriers for all foreseeable future. Thus, to qualify...

Fluid production from or injection into a subsurface reservoir leads to stress pressure changes inside and outside the reservoir. The overburden often consists of low permeability shale, and the undrained pore pressure response may be estimated from Skempton’s empirical equations. The key...

Seismic monitoring of reservoir and overburden performance during subsurface CO₂ storage plays a key role in ensuring efficiency and safety. Proper interpretation of monitoring data requires knowledge about the rock physical phenomena occurring in the subsurface formations. This work focuses on rock...

CCS is a well-studied technology to efficiently reduce anthropogenic CO₂ from the atmosphere, which is believed to be one of the main factors contributing to global warming. In this paper, we investigate possible changes in the mechanical properties of a shale caprock, when in contact with injected...

Recently, polymer-coated nanoparticles were proposed for enhanced oil recovery (EOR) due to their improved properties such as solubility, stability, stabilization of emulsions and low particle retention on the rock surface. This work investigated the potential of various polymer-coated silica...

It has been shown that some shale formations form barriers around a casing of a well due to shale creep that results in closure and sealing of the annulus around the casing. The existence of such shale barriers facilitates plug and abandonment (P&A) operations, which includes significant cost...