Abstract
This study presents both theoretical and experimental calculations for the amount of desorbed gas, lost gas, and residual gas from the coal core and gas composition analysis in order to measure the coalbed methane content of the studied coal mine in Mongolia. Three wells (1, 2, and 3) were studied, and the results from well 3 were analyzed. The amount of desorbed gas was measured to be 6.740 scf/ton in sample 7. The amount of lost gas was calculated using the direct method and the maximum amount calculated from sample 1 was 0.986 scf/ton. After crushing the sample to < 60 mesh and measuring four samples, the average crushing rate was approximately 71% and no residual gas was detected. Gas composition analysis showed that although methane gas was detected in almost all samples, the amount was only 1.17% in average, whereas nitrogen was detected with an average of 85.29% and with a small amount of carbon dioxide.
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