CCS

Geolink has carried out studies to assess the volume and quality of potential CO2 storage reservoirs in aquifers (North Sea and Norwegian Sea).

The aim is to carry out  a regional geological study in order to:

• Characterise the reservoir
• Characterise the upper seal
• Understand and evaluate the risks and uncertainties
• Create a 3D static model of reservoir and upper seal in which the CO2 flow simulation can be performed.

Potential carbon storage sites are far from oil licenses, with little seismic data and few wells. It makes it challenging to build an accurate static model with realistic heterogeneities in rock properties. Geolink has adapted its strategy to produce a high-quality static model adapted to the constraints and objectives of CCS, which are to:

• Predict the behaviour and migration of CO2 in the reservoir
• Estimate the effectiveness of the identified trapping mechanisms
• Assess the sealing of the cap rock
• Assess the sealing of fault.

The static model was fed with petrophysical data (net to gross, porosity, permeability) from to the surrounding existing wells. The propagation used geostatistics in combination with facies maps or seismic attribute maps. The heterogeneity was supported vertically by the well, and laterally by the maps.