Gas Prediction Of Deep Coal Seam Based On The Research On Gas-geology Law

In this paper, the research on the gas geological law of F15 seam of Pingdingshan No.12 mine is carried out. It has clarified the gas occurrence features under stepwise tectonic control in No.12 mine by using the regional geological evolution theory and the structural level-control theory. The deep seam gas has been predicted by studying the distribution regularity of gas occurrence, the formation and distribution characteristics of deformed coal, the geological control characteristics of coal and gas outburst.The research firstly analyzed the effects of geological tectonic, thickness of coal seam, the lithologies of coal seam roof and bottom, burial depth of coal seam and the overlying bedrock thickness to the gas bearing. The research revealed that the geological tectonic controled the gas occurrence and distribution of F15 seam and the other factors are affected by it. Controling by the structural the well field is divided into the south area of Niuzhuang syncline, the area between Niuzhuang syncline and Guozhuang anticlinal and the north area of Guozhuang anticline three gas-geological units. Next, according to the logging curve explanation, the distribution of deformed coal of the F15 seam has been summarized. The effects of layer slip structure and fault on the deformed coal distribution were analysed by combining with field tectonic evolution and distribution of coal seam gas occurrence. At last the distribution of the outbursts of the F15 seam has been summarized through analyzing the datas of coal and gas outburst. The outbursts of the F15 Seam are in zone distribution and concentrate in F6 mining area, the-350~-600 meter area of floor level and three level. According to the gas geological data, the impacts from controling factors on coal and gas outburst were analyzed inside each area by using gas geological theory. The mine factor which controlled outbursts happening and distribution inside each area, in order, is the geological tectonic, the change of thickness and angle of coal seam, the burial depth of coal seam. The result has provided theoretic guidance for deep coal seam gas predicting works.The gas content and gas emission distribution of deep F15 seam has been predicted based on the research on gas-geology law. With the mechanism of coal and gas outburst which tectonic coal acted as the core, coal and gas outburst hazard of deep F15 seam has been predicted through the qualitative and quantitative analysis.