The Gas-geology Law And Gas Prediction In Yixin Mine

The article uses gas occurrence tectonic level control theory，combines with theprevious research achievements，adopts the gas geology theory and methods，thenstudies the control effects of geological evolution on Hegang mining area ’s gasoccurrence. The research shows that Hegang mining area regional tectonic belongs tothe secondary suture zone,the JiHei fold system which is between Siberia plate andNorth China plate, and suffer from extrusion action again which comes from JiHei foldsystem and the North China plate from north to south. Within Hegang mining area, theNNW-NW tectonic is today’s extrusion property, the NW tectonic is mainly the pressureand twist action, which controls the coal seam gas occurrence; the extensional riftmovement of NE, NNE, the tectonic benefits the gas release. The overall law of Miningarea’s gas distribution is controlled by the faults complexity degree and magmaticintrusion, and performs that from north to south,gas content become smaller.The article seystematically analyse the influence of Yixin mine’s fault tectonic, coalseam buried deep, coal thickness, surrounding rock property on coal seam gas content,Through the qualitative analysis and quantitative linear regression, the Yixin mine’sgas-geology rule are as follows: the gas content increases along with the buried depthincreasing in the whole field range, In the north and south boundary rift zone, gascontent decrease, The main control factors that influence the distribution are the coalseam buried deep and rift structure. The article makes linear regression between coalseam floor elevation and the relevant gas content, establishes the gas concentrationprediction model, and forecasts the coal seam gas content in a certain depth range; Itadopts gas geology statistical method to predict the heading stope gas emission;On thebasis of analysing the actors that affect coal and gas outburst, it predicts the coal and gasoutburst danger.