The aim of this paper is to demonstrate the important role of ion composition for successful oil recovery by water injection and it also suggests possible mechanisms by which different ions interact with the carbonate rocks to alter the wettability.

Injected water contains, among other ions, sulfate and magnesium ions. The possible wettability alteration mechanisms of the calcite surface by Mg2+ and SO42- to more water-wet is addressed in light of contact angle measurements, and surface potential.

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