K6 Regional Modelling for Aramis: A Solution to Help Ensure Safe and Permanent Storage of CO2

As part of the Aramis Project, TotalEnergies plans to operate the K6-C and K6-D depleted gas fields as offshore CO2 storage sites. This extended abstract explains the innovative approaches used by TotalEnergies and their partners EBN to model the wider K6 regional area. This modelling effort comprises the permeable sandstone reservoirs, and the overlying and underlying formations. Several different commercial and inhouse numerical simulators were used to model the depletion of the gas, the repressurisation with cold CO2 and then the migration of the CO2 plume following the end of the injection period.

Rigorous “worst case scenario” forecasts help to define the maximum possible extent of the CO2 migration which define the limits of the storage complex. These forecasts also identify the locations of maximum pressure build up and temperature decrease. These results are then studied from a geomechanical point of view to ensure fault, caprock and well integrity for all wells (with a safety margin).

The modelling work presented is therefore a key tool to ensure the safe and permanent storage of CO2 in the K6 storage complex.