Conclusions

To better understand the mechanisms of CO2 geological sequestration it is necessary to study in detail the interactions of carbon dioxide with oil, formation water and with the reservoir lithologies under the conditions of miscible and immiscible oil displacement with carbon dioxide. It would be promising to study the physical-chemical mechanisms of long-term geological retention of CO2 in the form of insoluble organo-carbonate complexes in the oil reservoir at a later stage of its development. It is possible to form carbonate and organo-carbonate compounds in the oil reservoir via CO2 interaction with the mineralised formation water and any additionally injected chemical reagents. Such studies could result in the development of EOR technology which combines enhanced oil recovery and long-term geological retention of CO2 due to the creation of flow-deflecting screens via insoluble carbonate and organo-carbonate complexes in the oil reservoir.

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