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为了探讨高阶煤孔裂隙连通特征,以沁水盆地南部3号无烟煤层为研究对象,基于煤储层结构三维数字化建模方法,构建了煤层多级次孔裂隙网络结构模型并提取了关键参数,同时结合扫描电子显微镜观测,进一步确认了孔裂隙连通关系以及不同成因类型的孔隙对煤储层连通性的贡献。结果表明:高阶煤孔喉细小,以孔径小于50 nm的中孔为主;孔隙迂曲度较低,截面以方形和正三角形为主,毛管阻力较小;孔隙连通性较差,对连通性起主要作用的是孔径小于50 nm的中孔;差异收缩孔是主要的纳米连通孔隙,该孔隙的发育,形成了具有一定网络拓扑性质的渗流网络结构。孔裂隙网络结构模型表征了孔裂隙分布特征与拓扑关系,能够实现煤岩内部空间的数字化、可视化表征。
In order to investigate the connectivity characteristics of fractures in high-order coal bores, taking No. 3 anthracite coal seam in the southern part of Qinshui Basin as the research object, a multi-level sub-pore fracture network structure model of coal seam was constructed based on the three-dimensional digital modeling method of coal reservoir structure and the key parameters , And combined with the scanning electron microscopy observation, to further confirm the connectivity of the pore fissures and pore types of different genetic contribution to coal reservoir connectivity. The results show that the pores in the high-order coal pores are small, and the mesopores are dominated by pores with a diameter less than 50 nm. The porosity of the pores is dominated by square and equilateral triangles with small capillary resistance and poor connectivity. The main function is the mesopore with pore size less than 50 nm. The differential shrinkage pore is the main nanocommunicate pore. The development of this pore forms a seepage network structure with some network topological properties. The pore-fracture network structure model characterizes the distribution of pore fractures and their topological relations, enabling the digitalization and visualization of the internal space of coal and rock.