构造煤的孔隙结构实验研究

Experimental Study on Pore Structure of Tectonic Coal

通过对不同煤体结构的低温氮吸附实验发现,各孔径段的孔容比与比表面积比是不对应的,特别是微孔的孔容较小,但是比表面积较大。与原生结构煤相比,共生构造煤在各阶段孔容和比表面积都有所增加。煤储层孔隙是瓦斯的主要聚集场所,而且也是其运移通道;孔隙结构不仅制约着煤体的瓦斯含量,而且对解吸和扩散也有重要影响。

Through low temperature nitrogen absorption test of different coal structure,we found that pore volume of each aperture segment does not correspond with the specific surface area ratio,in particular,pore volume of micro-pore is small,but it has larger specific surface area. Compared with the native structure of coal,symbiotic structure coal increased the specific surface area and pore volume at various stages. Coal reservoir porosity is the main gathering place for gas,but also its migration path; pore structure not only restricts the gas content of coal,but also has an important impact on the desorption and diffusion.