Velocity vs. gas saturation

Pressure increases can cause the free gas in pore space to dissolve into liquid oil as it crosses the bubble point (Figure 10). Wang's measurements on Duri cores suggest that the effect of a decrease in gas saturation from 10% to 0% results in a velocity increase of 19-26%. An increase in gas saturation from 10% to 25% or more results in a 10-15% decrease in velocity. These results are plotted in Figure 12.