中国石油大学学报（自然科学版）2025，Vol.49Issue(3)：108-115,8.DOI:10.3969/j.issn.1673-5005.2025.03.011
SiO2纳米粒子对CO2地质封存页岩盖层突破压力的影响
Influence of SiO2 nanoparticles on breakthrough pressure of CO2 geological storage in shale caprocks
摘要
Abstract
Based on the Liujiagou Formation shale caprock in the Ordos Basin,the effect of injected nano-SiO2(SNPs)mixed with CO2 on the breakthrough pressure of shale caprock under in-situ temperature and pressure conditions was investi-gated in this study.The porosity and permeability of the shale caprock before and after the breakthrough experiment were compared and analyzed.Scanning electron microscopy was used to compare the micro-pore structure and morphology of the samples before and after the breakthrough experiments.The density and viscosity of the SNPs-CO2 fluids were calculated to determine the influence of different concentrations of SNPs on the sealing ability of the caprock and to reveal the potential and mechanism of strengthening the sealing ability of the caprock by SNPs.The results of the breakthrough experiments show that SNPs can effectively seal the pores and fractures in the shale caprock and reduce their porosity and permeability,hence in-creasing the breakthrough pressure and the sealing ability of the caprock.As the mass percentage of SNPs in the nanofluid in-creases,the breakthrough pressure of fractured and non-fractured cores increases,and the porosity and permeability both de-crease.Scanning electron microscopy observation shows that SNPs can be distributed relatively evenly in the rock at a certain injection concentration range and can form an effective protective layer on the surface of the caprock pores,enhancing the sealing ability of the caprock.The density of the SNPs-CO2 fluid is higher than that of pure CO2,which can limit the migra-tion of CO2 into the caprock and reduces the interaction between CO2 and the caprock.The viscosity of the SNPs-CO2 fluid is higher than that of pure CO2,which can reduce the permeability of the fluid in the caprock and increases its flow resistance.The difference in density/viscosity between SNPs-CO2 fluid and pure CO2 is much smaller than the difference in permeability between the caprock and storage rock,indicating that SNPs have a minor impact on the migration of CO2 in the storage reser-voir rock.关键词
CO2地质封存/纳米SiO2/突破压力/盖层/封堵能力Key words
CO2 geological storage/nano-SiO2/breakthrough pressure/caprock/sealing ability分类
能源科技引用本文复制引用
李颖,梁浩,李海涛,周军平,李可,LEONHARD Ganzer,黄天杰,潘若生..SiO2纳米粒子对CO2地质封存页岩盖层突破压力的影响[J].中国石油大学学报（自然科学版）,2025,49(3):108-115,8.基金项目
国家自然科学基金面上项目(42272176) （42272176）
