The topic of carbon dioxide (CO2) in the subsurface relates to enhanced recovery efforts and the fate of CO2 in injection and sequestration scenarios. The papers in this special section address those situations from the perspectives of formation evaluation, injection practices, and time-lapse monitoring. The fields under study in these papers all drastically differ from one another in geologic complexity, so no standard workflow suffices to characterize all of them. These papers paint a good picture of the range of issues associated with the understanding of CO2 in the subsurface.

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