Research Article
Evaluation of Coal Seam Gas Drainability for Outburst-Prone and High-CO2-Containing Coal Seam
Table 4
Test results of the whole gas database and typical hard-to-drain area database.
| | Categories | Whole gas database | Typical hard-to-drain area database | | “Pass” samples | “Fail” samples | “Pass” samples | “Fail” samples |
| | Number of samples | 325 | 194 | 31 | 63 | | Accounting ratio | 62.6% | 37.4% | 33.0% | 67.0% | | Average QM value | 4.4 m3/t | 9.2 m3/t | 5.2 m3/t | 7.8 m3/t | | Average CH4 composition value | 17.1% | 14.0% | 8.5% | 12.5% | | Average CO2 composition value | 73.5% | 82.6% | 4.6% | 4.5% |
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