The database help assess the technical feasibility questions for CO2 underground storage in North German Basin and the German North Sea region serving as a reference for “direct air capture and storage for reaching CO2 neutrality” project. The main purpose for this database was to gather uniform geological data information for characterizing depleted hydrocarbon fields and deep saline aquifers, supporting strategic decision making for pilot project to establish a direct air capture and storage demonstrator in Germany.

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.

The geological coordinates have been converted to WGS 84 / UTM zone 33N with QGIS authority projection number as European Petroleum Survey Group (32633). Most geological parameters were extracted based on TUNB model(BGR, LAGB, LBEG, LBGR, LLUR, & LUNG, 2022), additional petrophysical information were mainly collected from Müller & Reinhold, (2011), Reinhold et al., (2011) and Petroleum Geological Atlas of the Southern Permian Basin Area, (2010) projects. Additionally, this database can also serve as a valuable resource for other types of underground storage characterization.