Table 4
T2 spectrum distribution obtained from NMR tests for the three core samples.
| Core no. | Injection condition | T2 distribution (%) |
||||
|---|---|---|---|---|---|---|
| 0.1–1 ms | 1–10 ms | 10–100 ms | 100–1000 ms | |||
| Before CO2 flooding | 14.07 | 38.50 | 35.87 | 11.55 | ||
| 2–1 | 9.1 MPa | After CO2 flooding | 15.19 | 38.56 | 35.19 | 11.06 |
| Difference | +1.12 | +0.06 | −0.68 | −0.49 | ||
| Before CO2 flooding | 11.84 | 32.97 | 39.00 | 16.19 | ||
| 2–3 | 16.2 MPa | After CO2 flooding | 12.22 | 34.93 | 37.84 | 15.01 |
| Difference | +0.38 | +1.96 | −1.16 | −1.18 | ||
| Before CO2 flooding | 13.12 | 20.71 | 49.32 | 16.85 | ||
| 2–5 | 22.1 MPa | After CO2 flooding | 16.13 | 20.97 | 48.18 | 14.72 |
| Difference | +3.01 | +0.27 | −1.15 | −2.13 | ||