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 in CO₂-EGR in unconventional resources such as coal beds and shale to extract the knowledge from these reservoirs. In addition, various factors that control the displacement efficiency of natural gas by injecting CO₂ and the consequent influence of CO₂ on rock integrity are discussed. Nanoscale basis of CO₂-EGR using multiscale molecular simulation that could improve the design and operational conditions for CO₂-EGR operations is overviewed. Furthermore, this article assesses the ecological and economic impact of storing CO₂ in different types of reservoirs. Field pilot tests, as well as challenges in the application of the CO₂-EGR technique, are also covered.

CO ₂排放量的增加和全球变暖的副作用促使研究人员寻找具有高容量的安全可靠的储存地点。在可用的CO ₂捕集阱中，枯竭的气藏具有隔离CO _2的高潜力。在天然气生产和减压后，衰竭的常规和非常规储气库具有较大的孔隙空间。此外，与不含水的盖层或其他地质圈闭相比，它们具有在不渗透盖层的密闭储层中储存碳氢化合物多年的能力，提供了更安全的选择。注入CO ₂后增量回收残余天然气可以降低该过程的成本。此次审查重点介绍了调查CO的工作₂在常规贫化砂岩和碳酸盐岩储层中，在典型储层条件下用于EGR应用的吸附/解吸。此外，它分析了CO ₂ -EGR在非常规资源（如煤层和页岩）中的进展，以从这些油藏中提取知识。此外，讨论了通过注入CO ₂来控制天然气驱替效率的各种因素以及随之而来的CO ₂对岩石完整性的影响。使用多尺度分子模拟的CO ₂ -EGR纳米尺度基础可以改善CO ₂的设计和运行条件-EGR操作概述。此外，本文评估了在不同类型的油藏中储存CO ₂的生态和经济影响。还涵盖了现场先导测试以及CO ₂ -EGR技术应用中的挑战。