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为了研究巨厚火成岩对下伏煤层瓦斯赋存的控制作用,以海孜煤矿10煤层火成岩不同覆盖厚度区域所取5个煤样为研究对象,测定了坚固性系数、瓦斯放散初速度、瓦斯吸附常数、突出危险性指标K值等参数随火成岩覆盖厚度的变化,同时采用工业分析、CO2测微孔、电镜扫描、显微组分分析、镜质组反射率测定等方法研究了火成岩对煤质、孔隙结构的影响。结果表明:巨厚火成岩分布对下伏煤层煤质及瓦斯赋存具有控制作用,其热演化和热变质作用提高了10煤层变质程度,10煤层由无火成岩覆盖区的长烟煤逐渐演化为巨厚火成岩覆盖下的瘦煤;随上覆火成岩厚度增加,10煤层微孔发育,吸附和储集瓦斯的能力增强,瓦斯含量增加;火成岩侵入带来的挤压作用使厚覆盖层下煤层强度降低,局部更易形成软煤分层,增加了煤与瓦斯突出危险性。
In order to study the control effect of huge thick igneous rocks on the gas occurrence of the underlying coal seam, five coal samples from igneous rocks of different seam thickness of 10 seam in Haizi Coal Mine were selected as the research objects. The factors such as solidity coefficient, initial gas diffusion rate, gas adsorption Constant, highlighting the K value and other parameters with the changes of igneous rock thickness, and using industrial analysis, CO2 micropore, electron microscopy, microscopic component analysis, vitrinite reflectometry and other methods of igneous rock on the quality of coal , Pore structure of the impact. The results show that the distribution of huge thick igneous rocks has the control effect on the coal quality and gas occurrence of the underlying coal seam. The thermal evolution and thermal metamorphism increase the degree of metamorphism of No 10 coal seam. In No 10 coal seam, the long- With the increase of the overburden igneous rock thickness, the micropores of the No.10 coal seam develop, the ability of adsorbing and accumulating gas is enhanced and the gas content is increased. The compressive effect caused by igneous intrusion leads to the decrease of the strength of coal seam under thick overburden, Part of the formation of soft coal layer easier to increase the risk of coal and gas outburst.