Coal Metamorphism’s Influence on Coalbed N2 Concentration in Mining Area

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Based on the systematic analysis of the data of 46 coalbed gas samples, this paper discusses the coal metamorphism’s influence on coaled N2 concentration in Mining Area . The results show that:Yanshanian magma’s "baking" is the main reason for the high N2 concentration; The coal metamorphic degree enhanced, ratios of N2/CH4 present the changing rule of "increase-decrease-increase"; In coking coal stage, the liberation rate of N2 by thermal ammonization is faster than the liberation rate of CH4, so ratios of N2/CH4 increase; In meager coal stage, NH3 generated by thermal ammonization participates in the formation of ammonium illite in the form of NH4+, thus the liberation rate of N2 decreases relatively, so ratios of N2/CH4 decrease; In the lean coal stage, organic nitrogen liberates N2 by thermal cracking effect, N2 concentration increases relatively again, so ratios of N2/CH4 increase.

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44-47

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April 2013

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