Review Article
Review of the Hydrogeological Controls on Coalbed Methane (CBM) and Development Trends
Table 5
Distribution of gas content in different hydrochemical zones of the No. 11 coal seam in the Hancheng mining area [
44].
| | Hydrochemical zone | HCO3-−Na+ zone | HCO3-−Cl-−Na+ zone | SO42-−Cl-−Ca2+−Na+ zone | Cl-−Na+ zone |
| | Number of samples | 5 | 10 | 5 | 5 | | Current gas content (m3/t) | 4~6 | 6~9 | 8~13 | 12~15 | | Current average gas content (m3/t) | 5.5 | 8.3 | 11.6 | 14.1 | | Original gas content (m3/t) | 11~15 | 10~15 | 9~16 | 10~16 | | Original average gas content (m3/t) | 13.9 | 14 | 14.1 | 14.3 |
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