| Gas is the biggest hazard source to the safety production in a coalmine. Gas geology is the most important foundation for prevention and treatment of gas. It studys the formation, transport, storage of gas and geology's control to gas disaster.Using tectonic gradual control theory to study Geological structure's control to gas occurrence. In order to stuy the law of gas occurrence, we need Combine a lot of gas information and measured gas parameters with geological chaaracteris.On the basis to predict gas content,gas emission and coal and gas outburst in mine.After experiencing Tectonic movement of Yanshan and Himalayan period,Complex faults are formed in Hegang basin. Today the nature of NNW-NW tectonic is compressional It control gas occurrence and facilitate the gas outburst occurs. Near SW,NE and NNE direction structures are extensional.They conductive to release a lot of gas. Pyroclastic rocks, volcanic rocks and Nanling conglomerate are Extensively developped in mining formation. They cover the seam coal. The magma activities Intensly in the northern part ofmining, so that gas content increases with the increase of coal rank.Analysis the impact of the structure,coal rock lithology,magmatic rock distribution and thickness of coal seam depth on the gas deposit.Through qualitative analysis and quantitative linear regression obtained the gas and geological laws in Xing-an mine:The gas content increase with depth throughout the whole mine. The gas content in North and South boundary fault is lower. The seam depth and structure are controlling factors affecting the distribution of gas. By linear regression the gas content with the depth of the seam,we can establish the predictive model of gas content and predict the gas content within a certain range of depth. Utilizing Sub-source prediction method to predict the Gas Emission in the coal face. On the basis of analysis of coal and gas outburst factors, this paper forecasts the coal and gas outburst dangerous area. |
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