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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractSequestration of carbon dioxide (CO 2 ) in depleted oil reservoir is a strategy currently being considered to reduce the amount of CO 2 in the atmosphere. However, a better understanding and prediction of the geologic processes that control CO 2 injection in porous geologic media is necessary before depleted oil fields can become a safe and economical sequestration option. This paper provides new experimental and modeling results from a Department of Energy's (DOE) National Energy Technology Laboratory (NETL) sponsored CO 2 sequestration project investigating these issues. Geologic modeling and numerical flow simulations are used to study the feasibility of injection into porous media. Interactions between injected CO 2 , reservoir fluids and reservoir rock are taken into account, including CO 2 dissolution in water and water reaction with reservoir rock. These results are helping to design geophysical monitoring studies to track the injected plume. Laboratory tests and reaction path simulations were also used to investigate the fate of injected CO 2 with reservoir fluids and minerals during extended static tests with reservoir core and brines. Results may help identify long-term geochemical processes that will affect sequestration.

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