<p>Non-hydrocarbon injection gases such as carbon dioxide and flue gas offer low-cost, green substitutes for traditional hydrocarbon gases to be used in enhanced oil recovery. However, issues such as asphaltene precipitation and formation damage raise doubts about their use in tight carbonate reservoirs. While CO₂ injection has been extensively studied, few experimental results are available for flue gas. The present paper presents a systematic experimental comparison between synthetic flue gas and CO₂ in eight middle flooding experiments with recombined live oil and two low-permeability carbonate cores. The effects of gas type, pressure, volume of gas injected, and temperature on oil recovery, asphaltene deposition, and permeability damage were evaluated. CO₂ injection resulted in about 15% more oil recovery than was obtained with flue gas at equal pressure. Equal oil recovery was achieved by the injection of flue gas at 20 to 30% higher pressure and 10 to 15% lower volume of gas. CO₂ even caused up to 18.6% higher asphaltene deposition and 67% more formation damage than flue gas under identical conditions. The influence of injection pressure and temperature on the formation damage behavior has also been discussed in this study. The results confirm that flue gas injection is an applicable alternative to CO₂ for EOR in carbonate reservoirs.</p>