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 16

Microscopic remnant oil distribution patterns. G: grain; Ot: oil type; Ot1: adsorbed-particle-shaped; Ot2: oil-film-shaped; Ot3: slit-shaped; Ot4: pore-center-precipitation-shaped; Ot5: throat- shaped; Ot6: corner-shaped; Ot7: foggy-shaped; Ot8: intergranular-adsorbed-shaped; Ot9: intragranular-shaped; Ot10: cluster shaped.