中国石油大学学报（自然科学版）2017，Vol.41Issue(1)：11-24,14.DOI:10.3969/j.issn.1673-5005.2017.01.002
页岩纳米级孔隙结构特征及热成熟演化
Structural characteristics and thermal evolution of nanoporosity in shales
摘要
Abstract
Samples from the lower Paleozoic marine shales and Mesozoic continental shale in the middle and upper Yangtze region were taken to investigate the structural characteristics and the thermal evolution of nanoporosity in shales using argon-ion milling technology,field emission scanning electron microscopy (FE-SEM) and low-pressure N2 adsorption experiments.The results indicate that there are four major pore types in the shales,including organic nanopores,interparticle pore,intraparticle pores as well as microfractures.TOC and Ro are the key factors controlling the development of nanoporosity volumes.For high thermal evolution shales,the order of the development extent of organic nanopores in different types of kerogen is type Ⅰ＞type Ⅱ ＞type Ⅲ.Quartz and clay minerals have indirect effects on the development and distributions of nanoporosity by controlling changes in TOC.Pore-size distributions and relative proportions of micropores,mesopores,and macropores are affected by thermal maturity evolution.During the high-over mature stage of shale,micropores and mesopores associated with organic matter have continuously increased with the raising thermal maturity.Under the condition of extremely high thermal maturity,the macroporous in the shales are transformed into mesopores and micropores,and the organic nanopores decrease,causing nanopore volume to be displayed a decreasing trend after the first increase with increasing thermal maturity.Thermal cracking gas and methanation of kerogen and soluble bitumen in shales can be the main reasons for organic nanoporosity formation.关键词
页岩/纳米级孔隙/孔隙类型/热成熟演化Key words
shale/nanoporosity/pore type/thermal evolution分类
能源科技引用本文复制引用
张建坤,何生,颜新林,侯宇光,陈小军..页岩纳米级孔隙结构特征及热成熟演化[J].中国石油大学学报（自然科学版）,2017,41(1):11-24,14.基金项目
国家自然科学基金项目(41302111) （41302111）
国家重大科技专项(2016ZX05006-006) （2016ZX05006-006）
