The objective of this experimental research is to improve the effectiveness of CO2 flooding in heterogeneous reservoirs. Activities are being conducted in three closely related areas: 1) exploring further the applicability of selective mobility reduction (SMR.) in the use of foam flooding, 2) exploring the possibility of higher economic viability of floods at slightly reduced CO2 injection pressures, and 3) taking advantage of gravitational forces during low interfacial tension (IF!), CO2 flooding in tight, vertically fractured reservoirs.