Experimental study of the effect of aging on fluid distribution in Middle Bakken cores

The experimental results indicated that hydrocarbon-saturated cores become slightly more oil-wet than brine-saturated cores. NMR measurements indicated that brine resides in smaller pores and as a brine film on grains regardless of aging time, and the core fluids re-distributed with time indicating a strong rock-fluid interaction. Finally, the analysis of oil production indicated the preponderance of chemical osmosis over imbibition as the mechanism of oil displacement in formations with high brine salinity.