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A detailed description of the United States Department of Energy (US-DOE) methodology for estimating CO₂ storage potential for oil and gas reservoirs, saline formations, and unmineable coal seams is provided. The oil and gas reservoirs are assessed at the field level, while saline formations and unmineable coal seams are assessed at the basin level. The US-DOE methodology is intended for external users such as the Regional Carbon Sequestration Partnerships (RCSPs), future project developers, and governmental entities to produce high-level CO₂ resource assessments of potential CO₂ storage reservoirs in the United States and Canada at the regional and national scale; however, this methodology is general enough that it could be applied globally. The purpose of the US-DOE CO₂ storage methodology, definitions of storage terms, and a CO₂ storage classification are provided. Methodology for CO₂ …