Comparison analysis on underground mine and mine surface gas content measuring and testing results in Jincheng Mining Area

In order to accurately understand the gas content distribution of the seams in the mine,to effectively control gas disaster and to develop and utilize the gas r esources,the paper analyzed the gas contents of 92 coalbed methane wells drilled in Sihe Mine ,Zhaozhuang Minefield and the neighboring regions. During the geological e xploration period, there were 86 gas contents measured there were in-situ gas contents measured in the underground mine during the mine production period. The results s howed that when the seam depth in Sihe Mine was about 300 ~ 450 m,the coalbed methane content was about 1.28 ~ 1.37 times higher than the site measured gas conten t in the underground mine and the gas content during the geological exploration period was about 1. 01 ~ 1. 10 times higher than the gas content measured in the undergro und mine.When the seam depth in Zhaozhuang Mine was about 600 ~ 750 m,the coalbed methane content was about 1.05 ~ 1.41 times higher than the site gas content me asured in the underground mine.When the seam depth was about 450 ~ 700 m,the geological gas content was about 1.01 ~ 1.35 times higher than the site measured gas C ontent in the underground mine.Based on the circumstances,the main causes to make differences of the multi-source gas content data would be the different parameter me asuring and testing condition,ifferent sampling method,residual gas content measuring method and different contents.