Study On The Gas Occurrence Law And Outburst Regional Prediction Of â…¡₂Coal Seam In Juji Coal Mine

In this paper, takingâ…¡₂coal seam of Juji coal mine in Yongcheng mine field as theresearch object, the structural distribution characteristics and the influence of tectonicevolution to gas occurrence in Yongcheng mine field were analyzed by the regionalstructure evolution and the gas occurrence tectonic gradual control theory. Thestructural characteristics, the hydrological geology characteristics and the magmaactivity characteristics in Juji coal mine were studied. the relationship between themagma intrusion and the geological structure and the influence of magma intrusion tocoal seams and coal quality and gas occurrence were discussed in detail. The resultsshowed that the gas occurrence law of Juji coal mine was controlled and influenced bygeological structures and magmatic activity. In order to improve the research precisionof gas occurrence law, a great quantity of gas content control points were obtained bymulti-source gas data fusion technology. Gas geology units were divided according tothe gas geology characteristics of Juji coal mine and the influence of gas geology factorsto gas occurrence in each gas geology unit was analyzed, then, the gas geology law ofeach gas geology unit was obtained. The influence of geological factors to gasoccurrence in each gas geology unit was analyzed comprehensively by grey-relationanalysis method and the main controlling factors of gas occurrence in each gas geologyunit were determined. The conclusion showed that the main controlling factors,influencing gas occurrence were different in different gas geology units, but the burieddepth of coal seam was the most important controlling factor in each gas geology unit.The forecasting mathematical models of the gas content in each gas geology unit wereset up as y=0.013x1-0.024x2+0.567x3-4.026and y=0.041x1+0.09x2+1.294x3-30.852bymultivariate linear regression analysis methods. Finally, the conclusion that â…¡₂coalseam in Juji coal mine had the outburst risk was gained based on the comprehensiveanalysis of the gas parameters and the coal structure conditions of â…¡₂coal seam in Jujicoal mine and the coal and gas outburst danger zone in the first and second gas geolgyunit was determined as area deeper than740m and830m.