中国石油大学学报（自然科学版）2025，Vol.49Issue(3)：19-27,9.DOI:10.3969/j.issn.1673-5005.2025.03.003
碳酸盐岩储层油岩相互作用的离子调控机制
Ionic regulation mechanisms of oil-rock interactions in carbonate reservoirs
摘要
Abstract
The oil-rock interaction in carbonate reservoirs determines wettability,which in turn affects oil recovery.And ions have a regulatory effect on this interaction function.The ionic regulation of asphaltene-calcite interactions under dry/hydrated pore conditions and its influence on reservoir wettability and recovery were studied at multiple scales through core flooding ex-periments,atomic force microscopy(AFM),ultraviolet-visible spectroscopy(UV-Vis),and molecular dynamics(MD)simulations.Results demonstrate that asphaltene-calcite interactions significantly affect oil recovery.Monovalent ions(Na+)exhibit limited enhancement of interfacial interactions.However,divalent ions(Ca2+,Mg2+)substantially strengthen inter-actions through strong attractive forces under high-salinity conditions,in which Ca2+shows particularly prominent effects.The pretreatment of with CaCl2 and MgCl2 solution high-salinity increases equilibrium asphaltene adsorption capacities by 36.6%and 28.8%,which significantly affects the wettability.Pore size enlargement can reduce asphaltene adhesive layer thickness and enhance crude oil mobility,and the water film on the pore surface weakens the asphaltene-calcite interactions.While,high-salinity formation water can partially restore asphaltene adsorption through ionic effects.关键词
碳酸盐岩储层/润湿性调控/沥青质吸附/离子特异性/分子动力学模拟Key words
carbonate reservoirs/wettability alteration/asphaltene adsorption/ion specificity/molecular dynamics simula-tion分类
石油、天然气工程引用本文复制引用
吴一宁,姚新龙,李嘉林,代英杰,戴彩丽,彭颖锋,刘一杉,袁彬,谢乾..碳酸盐岩储层油岩相互作用的离子调控机制[J].中国石油大学学报（自然科学版）,2025,49(3):19-27,9.基金项目
国家重点研发计划项目(2019YFA0708700,2022YFE0129900) （2019YFA0708700,2022YFE0129900）
