【摘要】 为了研究和顺地区高煤级煤的空间结构特征对煤层气运移的影响,借助光学显微镜进行了显微裂隙分析,采用压汞法和比重瓶法测试了煤孔径结构和孔隙率。分析了高煤级煤宏观裂隙及显微裂隙的发育状况、各孔径段比孔容、比表面积的分布规律、孔隙的闭合及连通情况。结果表明,该区煤中裂隙总体不太发育,小裂隙与微裂隙较大、中裂隙发育,局部裂隙填充闭合。孔隙率较高,孔隙主要为开放性孔隙,含部分半封闭性孔隙,过渡孔和微孔的孔容和比表面积占据了主导地位,中孔含量较小,成为气体运移的瓶颈,这种空间结构分布虽然有利于煤层气的吸附,但不利于煤层气的产出。更多还原

【Abstract】 To study the high rank coal space structure on the impact of methane migration in Heshun region,carried out mercury testing method and pycnometer methods testing coal pore structure and porosity.Analysis of macro-fracture and microfractures of high rank coal development condition,and,the distribution of specific pore volume and specific surface area in each pore size segment,pore closure and the connected situation.The results showed that the area is not developed in coal fractures,small fractures and microfissure is developer than big and middle fractures,the local crack partial closed.The porosity is high,the pore is mainly open,with some semi-closed pore,the transition pore and micropore pore volume and surface area to hold a dominant position,the content of mesopore pores is less and come into gas migration bottleneck,this spatial structure of distribution may help the adsorption of methane,but not conducive to the production of coalbed methane.更多还原