Study on Micropore Throat Fluid Seepage Characteristics and Oil Displacement Efficiency in Tight Reservoir

Figure 5

The characteristics of microscopic photos in water flooding experiments with the real sandstone micromodel. (a) Uniform displacement (Y245, 2111.60 m); (b) reticular displacement (J116, 2101.96 m); (c) finger-reticular displacement (Y215, 2118.47 m); (d) finger displacement(X29, 2331.00 m); (e) cluster residual oil (J43, 2041.93 m); (f) isolated residual oil (C335, 2303.72 m); (g) oil film residual oil (L37, 2285.47 m); (h) the corner of residual oil (J43, 2028.91 m).

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