Alkali Effect on Alkali-Surfactant-Polymer (ASP) Flooding Enhanced Oil Recovery Performance: Two Large-Scale Field Tests’ Evidence

Table 3

Pore structure parameter of FCL and SCL in Daqing Oilfield [72]].

No.	Sample no.	Throat mercury saturation (%)	Pore mercury saturation (%)	Mean pore radius (μm)	Mean throat radius (μm)	Mean pore-throat radius ratio	Microhomogeneity coefficient	Sorting coefficient	Main throat radius
1	FCL 1	25.06	51.89	242.12	15.433	18.6	0.702	1.799	13.463
2	FCL 2	28.44	56.6	195.77	10.907	21.3	0.545	2.216	19.856
Average		26.75	54.245	218.945	13.17	19.95	0.6235	2.0075	16.6595
3	SCL 1	33.91	30.66	166.11	8.231	32.9	0.633	2.482	7.261
4	SCL 2	28.11	35.15	168.85	9.327	34.4	0.717	3.127	9.127
5	SCL 3	33.06	31.93	161.1	8.287	32.3	0.592	2.551	7.331
6	SCL 4	48.96	28.12	129.48	8.155	35.7	0.627	2.861	7.403
Average		36.0	31.5	156.4	8.5	33.8	0.6	2.8	7.8