Research Article
Oil-Based Drilling Fluid Plugging Method for Strengthening Wellbore Stability of Shale Gas
Table 2
Total mineral component analysis of rock samples in the Longmaxi and Wufeng Formations.
| | Serial number | Well no. | Quartz | Potassium feldspar | Plagioclase | Calcite | Dolomite | Ankerite | Pyrite | Barite | Total clay minerals |
| | 1 | CN156 | 28 | 1 | 3 | 19 | — | 11 | 3 | 17 | 18 | | 2 | CN355 | 41 | — | 3 | 13 | 10 | — | 3 | 15 | 15 | | 3 | CN194 | 35 | 3 | 9 | 14 | — | 5 | 3 | 15 | 16 | | 4 | CN419 | 38 | — | 3 | 18 | 6 | 5 | 5 | 11 | 14 | | 5 | CN62 | 35 | 3 | 9 | 14 | 2 | 3 | 5 | 12 | 17 | | 6 | CN222 | 37 | 1 | 3 | 9 | — | 7 | 3 | 21 | 19 | | 7 | CN137 | 21 | 2 | 4 | 27 | — | 5 | 3 | 18 | 20 |
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