页岩孔隙结构研究进展及下扬子古生界页岩孔隙特征

A review of pore structures of shales and characteristics of pores in the Paleozoic shales from the Lower Yangtze region

天然气可以吸附或以游离态赋存在富有机质泥页岩及其夹层中,使页岩成为一种重要的非常规储集体。页岩的微米—纳米级孔隙是页岩气富集的重要场所,常规孔隙研究手段难以适用,目前,国际上尚没有关于页岩孔隙类型的统一分类方案。因此,页岩的孔隙结构特征成为页岩气勘探开发中的关键问题。总结近年来页岩孔隙结构的主要研究手段和分类,并初步分析了浙西—皖南下扬子地区古生界页岩的孔隙特征。

Natural gas can be found in organic-rich mud shales and their interlayers in an adsorption state or a free state,and shale formations are thus considered to be an important unconventional reservoir. Micro-nanoscale pores of shales are important space for shale gas accumulation. Common techniques used in conventional gas reservoirs are not suitable for shale gas. and till now there has been no common belief about the classification of pores in shales. Therefore,structures of pores in shale formations remain a key problem in the exploration of shale gas. This paper summarizes the recent techniques and classification used in pore structures of shales,and presents examples of the Paleozoic shales in the Lower Yangtze region.