Residual trapping capacity of subsurface systems for geological storage of CO2: Measurement techniques, meta-analysis of influencing factors, and future outlook

Coal Wettability: A Holistic Overview of the Data Sets, Influencing Factors, and Knowledge Gaps

“…Carbon capture and storage (CCS) is considered an effective and scientifically proven technique for reducing anthropogenic CO 2 emissions in a safe manner. − This approach involves the injection of captured CO 2 into suitable subsurface geological formations, such as saline aquifers and depleted oil/gas reservoirs. − The secure confinement of CO 2 within these geological media is facilitated through various trapping mechanisms, including residual trapping, structural trapping, dissolution trapping, and mineral trapping. − Notably, shale formations and unmineable coal seams have also been tested for their suitability for geological storage of CO 2 . − Coal seams and shales can trap enormous volumes of CO 2 via adsorption trapping. , Particularly, the injection of CO 2 into the coal seams has been receiving increasing attention due to its dual advantages in geological CO 2 storage and enhanced coalbed methane (ECBM) recovery. − Coal seams have also been tested for their suitability for hydrogen (H 2 ) storage in the context of the transition toward clean energy . Indeed, studies have shown the potential of H 2 adsorption in coals as well, albeit much lower than CO 2 . , …”