Abstract Carbon dioxide miscible injection is one of the non-thermal effective enhanced oil recovery (EOR) methods. In the Middle East, particularly Abu Dhabi, pilot testing is already implemented in the Rumaitha Field for CO 2 miscible injection. This paper investigates the means of improving CO 2 miscible injection by enriching it with N 2 and HC gases. The emphasis is on identifying CO 2 solvent mixtures with reduced MMP to achieve miscibility at reasonable injection pressures in Abu Dhabi fields. The minimum miscibility pressure (MMP) of targeted oils from Abu Dhabi carbonate reservoirs with mixtures of N 2 , CH 4 , C 2 H 6 , and HC rich gases of varying composition with CO 2 injection gas are evaluated through simulation. The first contact miscibility (FCM) and the multiple contact miscibility (MCM) of injected gases/oil mixture under reservoir temperature have been determined using WINPROP module of the Computer Modeling Group (CMG) simulator. In addition, the corresponding oil recovery factors for various N 2 /CO 2 content displacements were calculated by 1-D compositional simulation of slim tube using BUILDER and GEM module of CMG Simulator. Results show that miscibility is predicted to occur with multiple contact miscibility (MCM): vaporization and/or condensation mechanisms. The increase of C 2 H 6 concentration in the CO 2 injected gas reduced MMPs for targeted Oil 1 by 100 psi/10 mol%. However, N 2 , CH 4 and HC rich gas increments in CO 2 injected gas increased the MMPs for targeted Oil 1. MMP was observed to be 2300 psi for pure ethane with Oil 1. In addition, MMPs for targeted oils with N 2 /C 2 H 6 and N 2 /CH 4 injected gas mixtures are assessed. This study can open possibilities for future enriching of CO 2 and N 2 miscible injection to improve miscibility and recovery of oil.