The Gas-geology Law And Gas Forecasting In Didao Shenghe Minefield

The gas is the first killer in safety production of coalmine. The generation, migration, save of gas are controlled by geological tectonic evolution. Gas-geology theory is the most important foundation of the prevention and control of gas.paper used the theory of gas level-control,analysised the tectonic evolution of the Jixi minefield. Combined with the features of the gas occurrence,coal metamorphism,deformed coal distribution and coal-gas outburst in Jixi minefield,reach: The extent of Magmatism directly control the of coal rank,gas-generating and gas preserving conditions,also controls the gas distribution. The extrusion structures of NNW to NW is beneficial to Gas enrichment and Coal-gas outburst, The tension activities of NE to NNE tectonics make a lot of gas tobe freed. Dunhua-Mishan fracture and Pingynag-Mashan fracture are the controlling structures, The northern depression had destroyed more than southern depression.The structural in Didao Shenghe shaft minefield are controlled by Jixi minefield'. Analysised the impact of geological structure,magmatic hydrothermal activity,buried deep and coal rock lithology on the gas occurrence,divided the gas-geological unit. Through linear regression obtained that the gas content increase with depth in every gas-geological unit, established the predictive model and predicted the gas content within a certain range of depth. Utilized Gas-geology statistics and Sub-source prediction method to predict the gas emission in the coal face. Statisticaled the 770 times of coal-gas outburst accidents over the years,analysised the geological factors Influenced the coal-gas outburst, Combined with coal seam gas parameters, forecasted the coal-gas outburst risd areas.