CO2 Sequestration Potential of Unmineable Coal—State of Knowledge☆

Abstract Currently the U.S. Geological Survey (USGS) national assessment of geological carbon dioxide (CO 2 ) storage resource considers porous sandstones, limestones, and dolomites as potential storage formations. Assessment of an additional potential geologic storage resource within unmineable coal seams was deferred because no consensus exists on what constitutes unmineable coal. Because unmineable coal seams may be considered potential storage resources in future assessments, however, the USGS is researching factors affecting CO 2 storage potential in coal.