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All data collected for the database comes from public domains and therefore making it suitable for preliminary site screening and selection. However, detailed site characterization and further investigation are required for more comprehensive evaluation. For each of the identified storage sites found from previous publication and projects (Höding et al., 2009;Hystories, 2022; Poulsen et al., 2013), 9 parameters were selected for geological characterization for CO2 storage assessment, which are depth and thickness of storage formation, porosity and permeability, estimated storage capacity, caprock thickness, and reservoir integrity, as well as geothermal gradient. The determination of this parameters were generally following the instructions of International Organization for Standardization (2017), the ISO 27914:2017 standard outlines the requirements for carbon dioxide capture, transportation, and geological storage and other publications for site screening and selection instructions (Callas et al., 2022, 2023; Kim et al., 2022; Raza et al., 2016; Uliasz-Misiak et al., 2021), and further carved considering sound scientific approaches, best practice methodologies, availability of high-quality data,  and in-situ storage conditions. 

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