After the secondary recovery mode with FW, three cycles of brine and foam were performed. Core B31 was flooded with 2 PVs FW followed with three cycles of 0.5 PV for each injected fluid. The injected fluids were SS, CO2, and SW. The same design was applied for the other three cores except the brine was different. B35, B45, and B47 were flooded with d2SW, d10SW, and d50SW alternatively with foam, respectively. Because the four cores consist of the same materials, the oil recovery during FW flooding for all four cores was about the same.