扬子地区某些下古生界页岩孔隙特征及影响因素

利用光学显微镜、扫描电子显微镜、气体吸附法等方法，对扬子地区某些下古生界页岩的孔隙特征进行了研究。结果表明：样品孔隙发育，孔隙类型多样，包括有机质孔、溶蚀孔、残余原生孔隙、黄铁矿粒间孔以及黏土矿物形成的微裂隙；样品比表面积为2.99~35.26 m 2/g，孔体积为0.012~0.096 cm3/g；样品的TOC和黏土矿物含量与孔体积、比表面积存在一定程度的正相关，是控制纳米孔隙发育的主要因素。

Pore characteristics and their controlled factors of some Lower Paleozoic shales from the Yangtze area

Pore characteristics and their controlled factors of some lower Paleozoic shales from the Yangtze area were investigated in this paper using optical microscopy，scanning electron microscopy(SEM) and N2 gas adsorption method.The results show that different pore types are abundant in the samples，including pores in organic matter，solution pores，primary residual pores，iron pyrite inter-granular pores，and micro-fissure caused by clay minerals.The samples have pore specific surface area between 2.99-35.26 m2/g，pore volume between 0.012-0.096 cm3/g.The pore volume and pore specific surface area of the samples show some positive relationship with their TOC and clay mineral contents.They are major factors to control pore structures of shales.