Flow Unit Model of Channel Sand Body and Its Effect on Remnant Oil Distribution: A Case Study of PI Formation in the Eastern Transition Zone of Daqing Oilfield

Figure 17

Different types of microscopic remnant oil on microslides and the depths where the samples were obtained (Ot: oil type). (a) Adsorbed-particle-shaped (Ot1), No. 15-0214, 1148.1 m. (b) Oil-film-shaped (Ot2), No. 68-0074, 1162.97 m. (c) Slit-shaped (Ot3), No. 56-0147, 1160.69 m. (d) Precipitation-shaped (Ot4), No. 68-0068, 1162.97 m. (e) Throat-shaped (Ot5), No. 45-0039, 1159.05 m. (f) Corner-shaped (Ot6), No. 15-0216, 1148.1 m. (g) Foggy-shaped (Ot7), No. 23-0196, 1150 m. (h) Intergranular-adsorbed-shaped (Ot8), No.21-0203, 1149.42 m. (i) Intragranular-shaped (Ot9), No. 47-0099, 1159.29 m. (j) Cluster (Ot10), No. 47-0103, 1159.29 m.

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