Research Of The Gas-geology Law And Gas Forecasting In Tao No.2 Minefield

Mine gas storage rule determines the characteristics of gas emission, find out mine gas storage rule, can effectively prevent and control gas disasters.In this paper, using geological evolution and tectonic gradual control theory, combineing large statistics site measurement of the gas content, gas pressure data, Using gas geological mapping methods, studyed influence of geological evolution history (tectonic evolution history, sedimentary burial history, thermal history, coal rank - hydrocarbon generation history) on the Handan Mining Area gas formation, storage, transport, coverl; analysised characteristics of coal development and gas seam storage in Tao No.2 mine; analysised impact of the mine magmaticrock on gas, forecast gas content and gas emission of mine , forecasted area coal and gas outburst hazard, in aim at diacussing the geological evolution of the gas occurrence control characteristic in Tao No.2 mine.Magma intrusion can cause of regional thermodynamic metamorphism and improve the degree of coal metamorphism and change the nature of coal seams and surrounding rock, resulting in the increase of pores and fractures in coal seams and surrounding rock, and influencing coal in terms of gas adsorption characteristics. By analyzing gas emission rule of magma intrusion zone in Tao No.2 coal mine found that gas emission from gob is identified as the paramount factor. Magma intrusion along the 2 coal seam floor, thus more fissures in the roof of sandstone, while the overlying 1 coal seam is advantageous to strata closing, therefore, such combination strata close to surrounding rock provides excellent room for gas storage, which is evidently the chief factor for gas emission in the gob area. Extensional and Uplift movement happened in coal mine after magma intrusion, more fissures in surrounding rocks of magma intrusion zone, Methane emitted from deep fault that reduced gas quantity.Gas content varies as depth of burial, the thickness of roof clay rocks, and working thickness. Depth of burial is the main factor which influences the gas quantity of Tao No.2 coal mine.