Coal Seam Gas Occurrence Law in Erdaoling Mining Area of Helan Mountains Coal-filed

In order to study the coal seam gas occurrence law in Erdaoling mining area,through the measurement of coal seam gas content,on the basis of the gas geological theory,controlling factors of coal seam gas occurrence are analyzed.The results show that the magma thermal metamorphism is the root reason of gas content generally larger;the geological structure of mining area and coal seam buried depth are direct reasons of the gas distribution.