Study On Gas Desorption Characteristics And Influence Factors Of Content In Panji Deep Mining Area

Depth of coal mining gradually deepened in China, part of the mine has entered the stage of deep mining overall, Huainan coal mine is a typical representative of deep mining, but the deep coal resources exploration data is scarce, deep coal resources affected by high temperature, high pressure and gas pressure of deep coal seam gas desorption characteristics and the influence factors of gas content is not yet clear, deep mining gas problem is very serious.Analysis the existing coal mine in Huainan Panji exploration data (especially the deep exploration data), gas and coalbed methane exploration data, combined engineering experiments and laboratory tests carried out experiments to test mining area, using numerical simulation and analysis of maps, study the geological conditions of deep coal seam gas, deep coal bed methane desorption rate, desorption time and desorption rate of desorption characteristics, preliminary reveals the deep temperature and desorption time of coal seam gas loss calculated results and the influence of the deep gas desorption characteristics of coal seam.Analysis the effect factors of deep coal bed gas content, it is concluded that deep coal seam gas content in Panji mining area influenced by geological structure, the properties of surrounding rock, coal quality, the buried depth of coal seam and coal reservoir physical characteristics, little to do with groundwater, magmatic rocks and collapse column, the main factors affecting deep gas content of coal reservoir temperature.High temperature makes the deep coal seam gas adsorption amount is reduced, the measured gas content of coal seam is lower than previously forecast, and with the increase of buried depth decrease gas content is not increased but the overall trend, the negative effects of ground temperature of coal bed gas content is greater than the domino effect of reservoir pressure, namely the ground temperature increase of coal seam gas desorption quantity is greater than the coal reservoir pressure to increase the adsorption quantity of coal seam gas, and combine previous studies with the analysis and research of the relationship between the depth of the coal seam gas content this time to speculate deep coal seam gas content of critical depth at about1200m in Panji mining area.