中文摘要：

通过氩离子抛光-场发射扫描电镜、小角X射线散射及低温氮气吸附实验,对宁镇地区下志留统仑山5井等高家边组底部富有机质泥页岩孔隙结构进行分析,为下扬子区下志留统富有机质泥页岩的储层评价提供依据.研究表明：高家边组富有机质泥页岩含有大量的纳米级孔隙,包括有机质孔、矿物粒间孔、矿物粒内孔、微裂缝等,孔径分布复杂;优势孔径分布为介孔段,孔隙直径主要为2-50 nm.影响孔径分布的主要因素是矿物组成,脆性矿物和黏土矿物对微孔和介孔都有一定的影响,而有机质含量对泥页岩总体孔隙特征的影响并不明显.

英文摘要：

To provide data for the reservoir evaluation of the lower Silurian organic-rich shales in the Lower Yangtze Region, in this study we analyze the characteristics of pore structures of the shales based on the study of samples from the LunShan 5 well in the Ningzhen Area. Comprehensive methods were employed, mainly including field emission scanning electron microscopy (FE-SEM), small angle X-ray scattering (SAXS) and low-temperature nitrogen adsorption(LT-N2GA). Results indicate that the pores in the shales are generally nanoscale and can be classified into four types in general, i.e., organic pores, interparticle pores, mineral matrix pores and microfractures. The interparticle pores dominate among these multiple types of pores. The pore size distribution of the shales are complex, as mesopores (2~50 nm) were distributed most widely and some micropores (<2 nm) and macropores (>50 nm) have also been observed. In terms of the controls of the pore size distribution of the shales, we conduct a correlation between pore volume and brittle minerals (e.g., quartz, pyrite and albite) contents, clay contents and TOC. It is implied that mineral compositions are the primary control, contents of brittle minerals and clay minerals also play a certain influence (especially for micropores and mesopores), whereas TOC has the least impacts.