西安石油大学学报（自然科学版）2026，Vol.41Issue(2)：41-49,9.DOI:10.3969/j.issn.1673-064X.2026.02.005
致密油层自发渗吸与动态渗吸驱油微观机理实验分析
Experimental Analysis of Microscopic Mechanisms for Spontaneous and Dynamic Imbibition Oil Displacement in Tight Oil Reservoirs
摘要
Abstract
In order to clarify the utilization characteristics of microscopic pores in spontaneous imbibition and dynamic imbibition of tight sandstone reservoirs with different permeability levels,the conversion coefficient between T2 and pore throat radius of CMP pore-throat distribution was calibrated based on the experimental data of constant mercury injection(CMP)and low-field nuclear magnetic resonance(NMR).The spontaneous imbibition and dynamic imbibition experiments of the tight sandstone cores with three permeability levels fromYanchang Formation of Ordos Basin were carried out to study the micro oil displacement mechanism of the cores with differ-ent permeability levels under two imbibition modes,and to quantitatively evaluate the recovery factor of pores with three sizes and their contributions to imbibition recovery factor.The experimental results show that the permeability of Chang 6 reservoir in the study area can be divided into three levels of 0.03×10-3 μm2,0.13×10-3 μm2 and 0.26×10-3 μm2,and the throat radius is the main parameter controlling hydrocarbon connectivity and percolation ability.In the process of spontaneous imbibition,the contribution rate of small pores(r<1.56 μm)to the recovery factor is more than 30%,and with the decrease of permeability,the contribution rate of small pores in-creases.The dynamic imbibition recovery factor(17.73%～33.66%)is always higher than the spontaneous imbibition recovery factor(8.64%～17.52%).The contribution rate of mesopores(1.56～15.60 μm)to the recovery factor is always 40%,and it is domi-nant.With the increase of permeability,the contribution rate of small pores decreases,and the contribution rate of large pores(r>15.60 μm)increases.The research results provide a reference for improving the water injection development effect of tight oil reser-voirs.关键词
动态渗吸/自发渗吸/恒速压汞/核磁共振/微观孔隙/致密油Key words
dynamic imbibition/spontaneous imbibition/constant-rate mercury injection(CMP)/nuclear magnetic resonance(NMR)/microscopic pores/tight oil reservoir分类
能源科技引用本文复制引用
段宏臻,刘春雷,段胜强,张晓秋,张连梁,王永刚..致密油层自发渗吸与动态渗吸驱油微观机理实验分析[J].西安石油大学学报（自然科学版）,2026,41(2):41-49,9.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) （2016ZX05050）
国家重点研发计划"CO2驱油技术及地质封存安全监测"(2018YFB0605500) （2018YFB0605500）
