Analysis of coalbed gas occurrence law and main controlling factors in Mingfangou Coal Mine
In order to achieve accurate and efficient control of coal seam gas in Mingfangou Coal Mine,using experimental testing,nu-merical simulation,mathematical statistics,field testing,theoretical analysis and other methods to study the law of gas occurrence in Mingfangou Coal Mine,the main controlling factors of gas occurrence from the perspective of gas generation,storage and preservation were studied.The research results show that the gas content of the coal seam in Mingfangou Coal Mine is mostly distributed above 8 m3/t,up to 15 m3/t,and there is a negative linear relationship between the gas content and the elevation of the coal seam,and there is an obvious difference between the upper and lower coal seams with similar elevation.High gas content in mine is mainly controlled by good gas gen-eration conditions caused by high coalification stage,strong adsorption and storage capacity of coal seam caused by high coalification stage and strong coal deformation failure,and good storage condition of coal seam caused by low permeability.Gas content between up-per and lower coal seams is mainly controlled by different gas permeability and adsorption capacity caused by different coal rock compo-nents and structural extrusion effect.The increase of coal seam gas content with the decrease of elevation is mainly controlled by the depth and thickness of coal seam.In view of gas control,technical measures such as hydraulic fracturing should be adopted to solve the problem of low permeability of coal seams.
coal seam gascoalificationcoal rock compositioncoal seam permeabilitygas adsorption
NETL
NSTL
万方数据
