The Gas-geology Law And Gas Forecast Of Liangbei Coal Mining

The gas is the product of geological effects,and gas generation, migration,preservation conditions are controlled by geological effects. Coal-bearing stratawent through the complex geological evolution，then form the coal seam gasoccurrence status. But about half the number of state-owned key coals sufferfrom coal and gas outburst. The coal mine safety production and economicbenefits is seriously restricted.This article uses gas occurrence tectonic level control theory，and combineswith the large quantities measured gas data of Liangbei coal mine,uses themine’s gas geology theory and methods，then studies the control effects ofgeological evolution on YuZhou coal mine’s gas occurrence, and analyses theLiangbei coal mine’s gas occurrence and tectonic control characteristics;finallyit divides Liangbei coal mine into three geological units，and analyses themrespectively. The article finds out that the geological structure and coveringbedrock thickness of the firstⅠof geological units is the main control factors ofgas occurrence and the gas emission. And hydrological effects is also influencethe coal seam gas occurrence to some degrees. In the first Ⅱ gas geologyunits，the coal seam’s covering bedrock thickness plays control effects on coalseam gas content；In the first Ⅲ gas geology unit，coal seam gas content isaffected by geological structure and the roof lithology, and also affected by thecoal seam’s covering bedrock thickness， the above factors influence thedistribution laws of gas content and gas emission. The article directs at eachgeological unit’s characteristics, and predicts the mine gas content and on minegas emission separately. Meanwhile，it combines with the coal seam gas content,coal sturdiness coefficient, initial release velocity and outburst situation, anddivides the outburst dangerous zone，For the next step mining, ventilationdesign, mine gas extraction and exploitation, the coal and gas outburstprevention provides reference basis.