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Increasing CO₂ emissions and global warming side effects have prompted the researchers to look for safe and reliable storage sites that have high capacity. Among the available CO₂ capturing sinks, depleted gas reservoirs have high potential to sequester CO₂. Depleted conventional and unconventional gas reservoirs have large pore space after natural gas production and pressure reduction. Moreover, their ability to store hydrocarbons for many years inside the sealed reservoir with impermeable cap rocks provides safer options than saline aquifers or other geological traps. Incremental recovery of residual natural gas after injecting CO₂ could decrease the cost of the process. This review highlights the efforts made to investigate the CO₂ adsorption/desorption for EGR applications under typical reservoir conditions in conventional depleted sandstone and carbonate reservoirs. Moreover, it analyzes the advances …