Several of Algerian oil reservoirs are now at the end of their ＇＇life＇＇ eventhough most of the oil is still in place. The implementation of an enhanced oil recovery method can yield a substantial amount of additional oil. The present work deals with a study of two natural crude oils: one coming from the Mesdar field and the other from the Zarzaitine field. After a classical PVT study of two crude oils alone, the same measurements were carried out with many mixtures ＇＇oil injection gas＇＇. In a second step, displacements of both oils in an artificial porous medium were performed, and minimum miscibility pressures (MMP) were measured with different gases. Finally, a numerical simulation was carried out by means of a new ＇＇SIGMACORE＇＇ model to simulate the displacements.