Assessing The Geomechanical Effects Of Co2 Injection In A Depleted Gas Field In Poland By Field Scale Modelling

A field scale geomechanical model was developed in an early phase of the feasibility study considering geological CO2 storage in a depleted gas field in Poland. Geomechanical model of the gas field was adequate to evaluate the induced stress changes, the geomechanical effects on the top seal and induced surface deformation. The estimated geomechanical effects on the top seal are weak and do not pose a risk for the containment. The effects on the regional sub-vertical faults intersecting the reservoir are not expected to cause fault destabilization, except in the case of partial re-pressurization of non-connected neighbouring compartments. However, the reliability of fault stability assessment is low due to the lack of seismic data that would have made detailed mapping of faults at field scale possible. Our future work will include updating the existing model with a more detailed fault interpretation and dynamic reservoir simulation results when they become available.