Table 3
Rock mineral composition of Chang 8 reservoir in Huaqing area.
| Samples | Depths/m | Porosity/% | Permeability/×10−3 μm2 | Quartz/% | Potash feldspar/% | Plagioclase/ | Calcite/% | Chlorite/% |
|---|---|---|---|---|---|---|---|---|
| S2 | 2138.1 | 15 | 1.25 | 68.4 | 9.6 | 6.2 | – | 11.808 |
| S3 | 2192.6 | 11.08 | 0.521 | 50.3 | 13 | 20.1 | 1.9 | 7.747 |
| S4 | 2174.53 | 8.4 | 0.096 | 51.1 | 9.3 | 20.1 | 5.6 | 5.796 |
| S5 | 2242.4 | 10.2 | 0.406 | 60.1 | 16.5 | 12.5 | 0.8 | 7.227 |
| S6 | 2235.6 | 9.69 | 0.11 | 41.4 | 16.6 | 24.1 | 0.7 | 8.568 |
| S7 | 2062.2 | 11.18 | 0.74 | 64 | 9.1 | 15.2 | 0.6 | 7.125 |
| S8 | 2287.45 | 11.68 | 0.568 | 54.8 | 28.8 | 5.8 | 2.2 | 6.9 |
| S9 | 2189.4 | 13 | 0.524 | 60.7 | 20.8 | 7.2 | 0.9 | 7.968 |