Research Article
Evaluation of Coal Seam Gas Drainability for Outburst-Prone and High-CO2-Containing Coal Seam
Table 2
Summary table showing the evaluation factors that affect gas drainability.
| | Coal samples location | Depth | Gas drainability | Evaluation factor | | Gas type | Geological variation | Gas content | Gas adsorption capacity | Gas pressure | Permeability |
| | Haishiwan Colliery, China [32] | 800 m | Poor | CH4/CO2 | Faults related | 0.3 to 10 m3/t (CO2)
0.05 to 6.22 m3/t (CH4) | VLangmuir 33-26.69 m3/t (CO2) | 1-7.5 MPa | 0.00039–0.00051 mD | | Southern Sydney Basin, Australia [5] | — | Poor | CH4/CO2 | Faults and folds related | 1-20 m3/t (CH4 and CO2) | VLangmuir 32.57–64.53 m3/t (CO2)
VLangmuir 19.41–34.32 m3/t (CH4) | — | — | | Huainan Colliery, China [18] | 930 m | Poor | CH4 | — | 8.08 m3/t (CH4) | — | 3.7 MPa | 0.000146 mD | Luling Colliery,
China [33] | 800 m | Poor | CH4 | — | 18.2 m3/t (CH4) | VLangmuir 37.6 m3/t | 3.2 MPa | 0.0007 mD | | Southern Qinshui Basin, China [34] | — | Poor | CH4 | — | — | VLangmuir 38.66 m3/t
PLangmuir 2.5 MPa | 5.1 MPa | 0.02 to 2 mD | | Northern Appalachian Basin, USA [35] | — | Medium | CH4 | Faults related | — | VLangmuir 17.3 m3/t
PLangmuir 2.25 MPa | 2.1 MPa | 10-30 mD | | Black Warrior Basin, USA [36] | — | Medium | CH4 | Multiple faults and fractures related | — | VLangmuir 19.1 m3/t
PLangmuir 2.861 MPa | 0.648 MPa | 10 mD | | Rujigou Colliery, China [37] | 240 m | Poor | CH4 | — | — | — | 0.56 MPa | 0.16 mD | Wulan Colliery,
China [38] | 265 m | Poor | CH4 | — | 12.74 m3/t (CH4) | — | 1.3 MPa | 0.0074 mD | | Songzao Colliery, China [39] | 200 m | Poor | CH4 | Inclined, 22-35° | 19.96 m3/t (CH4) | — | 1.12 MPa | 0.0009143 mD |
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