2022 年 1 月 西安石油大学学报( 自然科学版) Jan． 2022
第 37 卷surface，which reduces the gravitation and cementation strength between rock skeleton par-
ticles，resulting in particle loosening，falling off and migration． The expansion volume，expansion stress and linear expansion rate of mont-
morillonite after hydration are greater than those of illite，and the hysteresis of stress expansion is the main reason for the change of mi-
cro pore structure of shale． The degree of hydration damage first increases rapidly and then tends to be stable with the increase of im-
mersion time，while the micro cracks in shale will expand first and then tend to closed under hydration．
Key words: micro pore structure of shale; hydration; expansion; micro crack
余致理，郭高峰，余恒，等． 水化作用下页岩微观孔隙结构伤害特征［J］． 西安石油大学学报( 自然科学版) ，2022，37( 1) : 44-50．
YU Zhili，GUO Gaofeng，YU Heng，et al． Damage of hydration effect to micropore Structure of Shale［J］． Journal of Xi’an Shiyou Univer-
sity ( Natural Science Edition) ，2022，37( 1) : 44-50．
收稿日期: 2021-08-01
基金项目: 国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”( 2016ZX05050)
第一作者: 余致理( 1985-) ，男，工程师，学士，研究方向: 采气工艺技术。E-mail: yuzlcqqk10@ 163． com余致理等: 水化作用下页岩微观孔隙结构伤害特征
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