Table 7.
Quantitative characterization and classification standards of microscopic remaining oil.
| Type | Typical Figure | Number of Occupied Pore Throats | Shape Factor | Contact Ratio | Euler Number |
|---|---|---|---|---|---|
| Clusterlike |
|
Connected Pore Number > 5 | G > 2 | C ≥ 0.4 | EN ≤ −1 |
| Multiporous form |
|
1 < Connected-Pore Number ≤ 5 | G > 2 | C ≥ 0.4 | EN > −1 |
| Columnar-like |
|
Number of Pore-Throats ≤ 1 | G > 2 | C ≥ 0.4 | EN > 0 |
| Dropletlike |
|
Number of Pore-Throats ≤ 1 | G ≤ 2 | C = 0 | EN > 0 |
| Membranous-like |
|
Thickness < 1/3 of pore throat’s diameter | G > 2 | C < 0.4 | EN > 0 |