Research Article
Study on a New Rock Fracability Evaluation Model of Shale Gas Reservoir
Table 1
Shale mineral composition characteristics of Wufeng-Longmaxi formation.
| Sample | Formation | Depth (m) | TOC (%) | Quartz (%) | K-feldspar (%) | Plagioclase (%) | Calcite (%) | Dolomite (%) | Pyrite (%) | Ankerite (%) | Clay mineral (%) |
| 1 | Longmaxi | 1399.47 | 0.94 | 32.9 | 2.6 | 6.6 | 10.3 | 9.8 | 0.9 | 4.4 | 32.5 | 2 | Longmaxi | 1875.68 | 0.48 | 13.9 | 0 | 4.3 | 40.8 | 7.6 | 0.9 | 9.1 | 23.4 | 3 | Longmaxi | 1934.25 | 0.52 | 24.6 | 1.3 | 4.2 | 21.8 | 8.6 | 0.8 | 6.6 | 32.2 | 4 | Longmaxi | 2054.63 | 5.45 | 47 | 0 | 3.4 | 13 | 11.2 | 1.8 | 5.6 | 18 | 5 | Longmaxi | 2062.88 | 2.40 | 30.2 | 1 | 2.4 | 27.8 | 6 | 0 | 6.1 | 26.6 | 6 | Longmaxi | 2164.24 | 1.92 | 35.9 | 1 | 6.3 | 6.9 | 3.2 | 1.9 | 3.1 | 41.7 | 7 | Longmaxi | 2174.36 | 2.71 | 34 | 1.2 | 2.8 | 13.1 | 3.3 | 1.4 | 0 | 44.1 | 8 | Longmaxi | 2177.01 | 2.50 | 41.5 | 0 | 1.9 | 14.3 | 0 | 1.9 | 0 | 40.5 | 9 | Wufeng | 2200.92 | 7.79 | 47.1 | 0 | 6.6 | 7.6 | 5.8 | 1.8 | 4.5 | 26.6 | 10 | Wufeng | 2205.24 | 3.28 | 54.2 | 0 | 1.6 | 12.5 | 2.9 | 0 | 2.8 | 26 | 11 | Wufeng | 2285.55 | 2.81 | 25.3 | 1.1 | 2 | 28.3 | 19.3 | 2.6 | 13.3 | 8.2 | 12 | Wufeng | 2287.34 | 1.74 | 25.7 | 0.8 | 1.7 | 30.7 | 12.3 | 2.6 | 10.2 | 16 | 13 | Baota | 2293.97 | 0.90 | 20.1 | 1.7 | 5.8 | 26.6 | 1.9 | 0.9 | 4.2 | 38.7 | 14 | Longmaxi | 2507.35 | — | — | — | — | — | — | — | — | — | 15 | Longmaxi | 2508.57 | — | — | — | — | — | — | — | — | — | 16 | Wufeng | 2512.11 | 4.85 | 27.3 | 1 | 4.8 | 24.2 | 14.4 | 2.3 | 12.1 | 14 |
|
|