dataset for experimental study of 'Role of the calcite-water interface in wettability alteration during low salinity waterflooding '

In order to understand the pore- and mineral-surface-scale processes that underpin improved oil recovery during controlled salinity waterflooding, the streaming potential measurements.  The two carbonate samples tested, Carbonate-I and Carbonate-II, have the same mineralogy, but the zeta potential of Carbonate-II is anomalously negative in highly saline, natural formation brine compared to the conventionally conventional positive value for Carbonate-I. After aging with same crude oil and using the same coreflooding protocol, improved oil recovery was observed in the oil-brine-Carbonate-II system during low salinity waterflooding, but not in the Carbonate-I system. We suggest that textural differences cause calcite crystal edges in Carbonate-II to be preferentially exposed to the brine in the pore-space, yielding different calcite-brine interfacial behaviour compared to the calcite crystal faces exposed in Carbonate-I.