Table 2. Results of the core simulation experiment with core samples from Block Liu and Block Wangyao.
| Core ID | Length (cm) | Pore volume ( mL) | Porosity (%) | Oil saturation (%) | Air permeability (×10−3 μm2) | Water content after water flooding (56%) |
Oil recovery |
||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Oil displacement efficiency (%) | Injected media (0.5PV) | Final efficiency (%) | Improvement value (%) | Avage improvement value (%) | MEOR value (%) | ||||||
| L3 | 6.94 | 4.36 | 12.69 | 53.9 | 4.70 | 19.15 | water | 40.43 | 21.28 | 23.00 ± 1.72 | / |
| L9 | 6.55 | 5.07 | 15.60 | 51.8 | 4.18 | 20.91 | 45.63 | 24.72 | |||
| L11 | 6.58 | 4.76 | 11.25 | 54.6 | 3.14 | 21.38 | 44.39 | 23.01 | |||
| L6 | 6.8 | 4.38 | 13.10 | 53.5 | 5.50 | 19.57 | Bacteria solution | 50.84 | 31.27 | 31.12 ± 1.07 | 8.12 ± 2.79 |
| L10 | 7.64 | 4.76 | 12.49 | 54.7 | 6.06 | 26.65 | 56.64 | 29.99 | |||
| L13 | 6.76 | 4.93 | 11.87 | 53.85 | 4.18 | 21.85 | 53.96 | 32.11 | |||
| W11 | 7.46 | 4.45 | 12.05 | 47.2 | 5.85 | 23.11 | Water | 37.82 | 14.71 | 14.19 ± 0.64 | / |
| W12 | 7.59 | 4.92 | 13.10 | 41.7 | 5.86 | 26.09 | 39.57 | 13.48 | |||
| W14 | 6.73 | 4.68 | 12.56 | 43.75 | 3.04 | 23.64 | 38.02 | 14.38 | |||
| W8 | 7.3 | 4.81 | 13.31 | 41.6 | 6.00 | 27.50 | Bacteria solution | 50.50 | 23.00 | 20.75 ± 2.54 | 6.56 ± 3.18 |
| W10 | 7.64 | 4.75 | 12.56 | 42.1 | 6.13 | 30.00 | 48.00 | 18.00 | |||
| W13 | 6.93 | 4.80 | 12.72 | 45.91 | 3.60 | 26.42 | 47.67 | 21.25 | |||