Identifying the assessment criteria according to which a hydrocarbon well can be reused for CO2 storage in a technically safe and economically feasible way. GeoEcoMar is the coordinator of the work package “Legislative, environmental and social aspects” (WP6). This work package requires each of the six participating countries to analyze the provisions of their own legislation regarding the reuse of oil and gas wells for carbon dioxide storage. This analysis aims to identify the possible legislative gaps, which national regulatory authorities need to fill in order to make the reuse of wells possible.