Abstract: With CT technique, oil saturation distribution can be measured. Original oil saturation and residual oil saturation of different sections and orthogonal intersections as well as 3-D oil saturation can be determined by core scanning in three states which are dry, saturated with formation water and oil displaced by water, thus realizing the visualization and quantitative characterization of oil saturation distribution in core water flooding experiment. The heterogeneity of core oil saturation distribution can be evaluated with standard deviation and variation coefficient. The difference between the CT value and real oil saturation is less than 3%, indicating that the result of CT technique is more accurate than those of other methods for description of the distribution and variation of oil saturation in core displacement test.

Key words: CT scanning image, core, displacement test, oil saturation, distribution