构造煤结构与瓦斯突出

采用有机溶剂萃取和煤成烃热模拟实验，对煤层受构造应力作用时的煤结构变化及构造煤的生烃特征进行研究.结果表明：构造煤的正己烷、苯萃取率与原生结构煤基本相近，而氯仿萃取率是原生结构煤的2倍多，构造煤含有很高的氯仿可溶低分子化合物；构造煤分子间的作用力小，决定了构造煤强度低和吸附性能高，从而控制了煤与瓦斯突出灾害的发生；煤的氯仿萃取率可以作为预测煤与瓦斯突出的指标.构造煤生烃潜力小，反映在构造应力作用下，曾经生过烃（瓦斯）.在构造应力作用下，煤中的有机质超前向两个方向演化，一方面聚合形成更大的高芳构化的大分子结构，另一方面则形成低分子化合物和气态烃（瓦斯）.

Deformed-coal structure and control to coal-gas outburst

Based on techniques of organic solvent extraction and the thermal model experiment of coal-related hydrocarbon,the variation of coal structure and the character of deformed coal-related hydrocarbon were studied when the coal seam was modified by the tectonic stress.The results show that the extraction ratio by n-hexane and benzene from the deformed coal is approached to that from the normal coal,but the extraction ratio by chloroform from the deformed coal is two times more than that from the normal coal,the deformed coal has higher solvable low-molecule compounds than the normal coal.The intermolecular force of deformed coal is relatively small,the deformed coal has low strength and high adsorption capacity,and those determine the outbreak of coal-gas outburst.The extraction yields by chloroform can be taken as an index to forecast risks of coal-gas outburst.The potentiality of generating hydrocarbon from the deformed coal is relatively low,the deformed coal generate hydrocarbon due to tectonic stress.In the process of the tectonic stress,the organics of coal is evolved to two different orientations,one hand forming the aromatic macromolecule network structure,on the other hand forming low molecular compounds and the gas hydrocarbon(gas).