Microscopic Residual Oil Distribution Characteristics and Quantitative Characterization of Producing Degree Based on Core Fluorescence Analysis Technology

Table 4

Absolute proportion of microscopic residual oil (each oil content in the table is the average of 20 analysis results).

Displacement method	Position	Different types of residual oil occurrence status and proportion (%)							Residual oil saturation in the field of view (%)	Residual oil saturation (%) in the core flooding experiment
		Bound state			Semibound state		Free state
		Hole surface film	Particle adsorption	Slit-like	Corner-shaped	Larynx	Cluster	Intergranular adsorption
Water flooding	Injection side	0.55	0.83	0.11	0.12	0.07	0.45	1.02	50.88	52.60
	Middle	0.95	0.92	0.31	0.30	0.09	0.91	1.65	51.32
	Production side	2.53	1.76	0.32	0.38	0.12	1.10	2.48	53.98
	Average	1.34	1.17	0.25	0.27	0.09	0.82	1.72	52.06
Polymer flooding	Injection side	0.46	0.86	0.09	0.09	0.06	0.47	0.84	36.04	40.65
	Middle	0.50	0.91	0.24	0.13	0.07	0.64	1.05	38.44
	Production side	1.70	0.98	0.25	0.24	0.10	0.77	2.04	42.09
	Average	0.89	0.92	0.20	0.15	0.08	0.62	1.31	38.86
ASP flooding	Injection side	0.37	0.72	0.08	0.07	0.04	0.35	0.71	27.25	30.93
	Middle	0.50	0.82	0.13	0.11	0.06	0.42	0.92	30.44
	Production side	1.16	0.99	0.15	0.17	0.08	0.61	1.67	35.45
	Average	0.68	0.84	0.12	0.12	0.06	0.46	1.10	31.05