赣西北地区下寒武统页岩孔隙特征及影响因素分析

he pore size and distribution，pore types and pore structure of the lower Cambrian shales in the northwestern of Jiangxi Province are analyzed by scanning electron microscopy, high-pressure mercury, specific surface area and other experiments. The results showed that: its pore is mostly micropores and transition pore and its aperture is concentrated in 5 ~ 17nm. The pore types is dominated by inter-crystalline pores，including little organic pores，microfracture，inter-crystalline pores and dissolution pores. The pore structure is complex，which is mainly composited by microporous. And its pore throat distribution is relatively concentrated so that its pore structure is medium grade. On this basis，the relationship among TOC，the mineral content of quartz，the mineral content of clay minerals，the organic maturity and the pore characteristics is discussed. It is revealed that the mineral content of clay minerals and the organic maturity are important to the development of pores. And their relationship is positive correlation. TOC and the mineral content of quartz have small impact on the development of pores.