Abstract:Abstract: Using the three-dimensional network model, the saturating oil, water flooding and polymer flooding processes are simulated and the residual oil distribution pattern is studied in this paper. The influences of pore size, coordination number, shape factor and wettability on the residual oil distribution are analyzed. The results show that: With the increasing of the pore size, coordination number and shape factor, the residual oil after polymer flooding decrease; the oil recovery of water wet reservoir is higher than that of oil wet reservoir. Key words: network model; polymer flooding; residual oil; microscopic distribution