Migration and Residual Trapping of Immiscible Fluids during Cyclic Injection: Pore-Scale Observation and Quantitative Analysis

Figure 4

Image processing procedure (W: water; H: hexane; G: glass): (a) a raw image (initially saturated with water), (b) a raw image (saturated with water and hexane), (c) the grey image of (b), (d) the binary image of (c) (after applying threshold, W and H+G), (e) the binary image from (d) subtracting the binary image of (a) (H and W+G), (f) the multicolored image from (d) and (e) (hexane in red and water in blue), (g) the multicolored image from (f) in a drainage cycle (immobile hexane in purple and immobile water in cyan), and (h) the multicolored image from (f) in a imbibition cycle.

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