In Salah CO2 injection modeling: A preliminary approach to predict short term reservoir behavior

Abstract

A short term performance assessment methodology under development and validation at the In Salah CO2 storage site is presented. The progressive approach first concludes of the necessity to consider a dual media reservoir system at Krechba to fit with gas reservoir production, CO2 injection and CO2 breakthrough at an old appraisal well (Kb-5). To improve gas migration prediction while also considering the geomechanical behavior of the site, an extended geomodel has been developed. Fluid pressure simulation results representative of the dual media reservoir model and of the simple medium upper layer ones (up to the water table) are used to initiate the geomechanical modeling. Comparison of the preliminary geomechanical simulation results assuming a poro-elastic behavior and InSAR satellite surface displacement data are coherent and in the same order of magnitude (∼20 millimeters at maximum displacement).