In mixed-wet pore networks, incremental oil from low-salinity flooding can only come from oil-wet pores, and improving microscopic sweep in those pores is necessary but not sufficient for extra recovery.
Martin, The effects of clay on the displacement of heavy oil by water, Paper SPE 1411-G presented at the 3rd SPE Venezuelan Annual Meeting, Caracas (1959)
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A Mechanistic Pore-Scale Analysis of the Low-Salinity Effect in Heterogeneously Wetted Porous Media
In mixed-wet pore networks, incremental oil from low-salinity flooding can only come from oil-wet pores, and improving microscopic sweep in those pores is necessary but not sufficient for extra recovery.