矿业科学学报2025，Vol.10Issue(6)：1130-1139,10.DOI:10.19606/j.cnki.jmst.2025051
基于核磁共振技术的水压作用下砂岩孔隙结构变化研究
Nuclear magnetic resonance study on pore structure of sandstone under water pressure
摘要
Abstract
To clarify the evolution law of sandstone pore structure under water pressure and reveal its dynamic change mechanism,an experimental study was conducted using nuclear magnetic resonance(NMR)technology.First,sandstone specimens with a size of 50 mm×25 mm were prepared and grouped;after pretreatment such as cleaning and drying,different water saturation pressures(5,10,20 MPa)and water saturation times(2,4,6,8,48 h)were set.Then,the NMR system was used to test parameters such as T2 spectrum,porosity,and water content of sandstone under different condi-tions,and the variation characteristics of pore structure were analyzed.Finally,the variation law of T2 spectrum was discussed from the perspective of physical mechanism,and its engineering application di-rections were sorted out.The results show that the amplitude of NMR T2 spectrum signals varies under different water pressures;as the water saturation pressure increases,the T2 spectrum curve shifts to the right with a decreasing shift amplitude,and the T2 spectrum area is positively correlated with porosity and water saturation pressure but with a decreasing growth rate;the water content and pore volume of sandstone increase rapidly within t=0～4 h,and the pore structure tends to be stable after t≥6 h;un-der the same water saturation time,the increase in water pressure causes damage inside the rock,and after the pressure reaches 10 MPa,the pore structure becomes stable and the rock is completely dam-aged;the higher the water content of sandstone,the better the pore connectivity and the lower the strength.关键词
饱水压/饱水时间/核磁共振(NMR)技术/T2 谱/孔隙率/含水率Key words
saturated water pressure/saturated water time/nuclear magnetic resonance(NMR)/T2 spectrum/porosity/water content分类
矿业与冶金引用本文复制引用
胡海峰,李鹏,陈明浩,张柏林,吴少康..基于核磁共振技术的水压作用下砂岩孔隙结构变化研究[J].矿业科学学报,2025,10(6):1130-1139,10.基金项目
国家自然科学基金(42102222) （42102222）
