关键词: 中低阶厚煤层, 瓦斯地质, 赋存规律

Abstract: Aiming at the typical medium-low rank thick coal seam problem of 8# coal seam in Baode mining area，the gas geological occurrence law of medium-low rank thick coal seam is studied. By analyz⁃ ing the gas genesis，gas adsorption performance，coal rock permeability and gas content distribution of coal seam，the gas geological occurrence law of medium-low rank coal seam in mining area is systematically ex⁃ plored. The results show that the elevation of the lower boundary of the gas weathering zone is +650~+776 m，and the depth of the weathering zone is 170~230 m.The gas content gradient is 2.82 m³/（100 m·t），the pressure gradient is 0.50 MPa/（100 m），and the predicted maximum absolute gas emission is 410 m³/min. It is predicted that the maximum gas content in the deep area of the mine field is 9.53 m³/t，and the maxi⁃ mum pressure is 2.07 MPa. This study provides a basis for drawing the gas distribution law of 8# coal seam and the next step of gas extraction，which is conducive to achieving the dual goals of gas disaster manage⁃ ment and gas resource utilization.

Key words: medium-low rank thick coal seam, gas geology, deposit law