Abstract:

Based on Gas-geology Theories and tectonic evolution, the mine field geological tectonic evolution and distribution characteristics are analyzed, the influence factors of gas occurrence, such as the geologic structure, roof and floor lithology, coal seam occurrence condition and so on are researched，by collecting the geologic and gas data systematically. On the basis of this, the mine field gas geological regularity and No.2 coal-seam gas content occurrence regularity are obtained by testing gas content and pressure, and the outburst danger of No.2 coal-seam is predicted. The research shows that: changes of tectonic coal caused by fracture structure and coal thickness and its variation are the main control factors that affect the gas content distribution and outburst happening. The result has provided theoretic guidance for coalmine coal and gas outburst controlling works.

Key words: coal and gas outburst, gas-geology regularity, geologic structure, region forecast