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An evaluation of hydrocarbon deposit tightness in aspect of CO₂ sequestration

Jacek Blicharski

Vol. 32, no. 4 (2015), s. 671-682

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Depleted hydrocarbon deposits due to large capacity and proven tightness are often considered as prime candidates for CO₂ sequestration in geological structures. The tightness of these structures is mainly connected with the exis-tence of water saturated overbunden rocks of very low permeability which form a natural barrier for the migration of hydrocarbons. This paper explains the sealing mechanisms of caprocks resulting from capillary forces at the interface of hydrocarbon – water and carbon dioxide – water contact. Other ways of caprock leakage due to rock fracturing or reactivation of natural faults and fi ssures were also investigated.