Article(id=1322957354173604073, tenantId=1146029695717560320, journalId=1322258508890079423, issueId=1322957283147252214, articleNumber=null, orderNo=null, doi=10.13809/j.cnki.cn32-1825/te.2025391, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1758038400000, receivedDateStr=2025-09-17, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793347212594, onlineDateStr=2026-10-30, pubDate=1774454400000, pubDateStr=2026-03-26, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793347212594, onlineIssueDateStr=2026-10-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793347212594, creator=13701087609, updateTime=1793347212594, updator=13701087609, issue=Issue{id=1322957283147252214, tenantId=1146029695717560320, journalId=1322258508890079423, year='2026', volume='16', issue='2', pageStart='225', pageEnd='488', issueExtLink='null', onlineDate='null', pubDate='1774454400000', pubDateStr='2026-03-26', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793347195659, creator='13701087609', updateTime=1793348987089, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1322964796999611071, tenantId=1146029695717560320, journalId=1322258508890079423, issueId=1322957283147252214, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1322964796999611072, tenantId=1146029695717560320, journalId=1322258508890079423, issueId=1322957283147252214, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=363, endPage=373, ext={EN=ArticleExt(id=1322957354370736362, articleId=1322957354173604073, tenantId=1146029695717560320, journalId=1322258508890079423, language=EN, title=Molecular dynamics study on occurrence and flow mechanisms of shale oil under kaolinite nanoconfinement, columnId=1322941693024141328, journalTitle=Petroleum Reservoir Evaluation and Development, columnName=Oil and Gas Development, runingTitle=null, highlight=

To improve the development efficiency of unconventional reservoirs, it is essential to clarify the microscopic occurrence states and flow migration characteristics of shale oil in clay mineral nanopores. Focusing on the widely distributed kaolinite in shale reservoirs and its interfacial effects, an intercrystalline nanoslit model was constructed through simulations of molecular dynamics (MD) to investigate the occurrence forms and dynamic behaviors of alkane components of shale oil in kaolinite nanopores. Simulations were conducted under different pore sizes (1-8 nm), reservoir temperatures (335.15-435.15 K), formation pressures (15-50 MPa), and driving forces. The influences of pore structure, temperature, pressure, and driving force on the density distribution, diffusion performance, and interfacial slip behavior of shale oil molecules were systematically analyzed, revealing the evolution mechanisms of shale oil in kaolinite pores under these effects. The results showed that increasing kaolinite nanopore size promoted the transition of shale oil molecules in the pore center from adsorbed to free states. The thickness of the adsorption layer increased simultaneously with the adsorption amount per unit area, forming a quasi-solid layer near the pore surface. Elevated temperature enhanced molecular thermal motion, weakened the interaction energy between molecules and the pore surface, and increased the diffusion coefficient by more than 3 times, indicating that thermal recovery could effectively improve shale oil mobility. Increased pressure strengthened liquid-solid interactions and molecular aggregation, restricting molecular motion and reducing the system’s overall diffusion capacity by approximately 30%. Under driving forces, shale oil exhibited pronounced interfacial slip, with slip length and average flow velocity increasing significantly with driving force, demonstrating that driving forces could effectively break through the limitations of nanoconfinement on molecular motion and enhance macroscopic flow response. Despite significant changes in flow states, the adsorption layer near the pore surface remained generally stable, reflecting the strong and stable adsorption capacity of clay surfaces for molecular layers. This study reveals the typical occurrence-migration synergistic mechanism of shale oil molecules in kaolinite nanopores and clarifies the variation patterns of molecular structure and transport parameters under different thermal and driving conditions. These insights provide molecular-scale theoretical support for the study of adsorption-controlled, diffusion-limited, and slip-dominated transport flow in clay pores and supply key microscopic parameters and model framework for optimizing thermal recovery and displacement strategies to enhance shale oil recovery.

, articleAbstract=null, authors=YUPENG ZHANG1, BO PENG1, 2, XIAOQIAN CHEN1, ZETENG WANG1, RUIQI WANG1, NINGJING SUN1, KAI CHENG1, YINGYING SUN3, authorsList=YUPENG ZHANG, BO PENG, XIAOQIAN CHEN, ZETENG WANG, RUIQI WANG, NINGJING SUN, KAI CHENG, YINGYING SUN, authorCompany=null, correspAuthors=BO PENG, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1322957358023975167, articleId=1322957354173604073, tenantId=1146029695717560320, journalId=1322258508890079423, language=CN, title=高岭石纳米限域下页岩油赋存与流动机制的分子动力学研究, columnId=1322941693259022355, journalTitle=油气藏评价与开发, columnName=油气开发, runingTitle=null, highlight=

厘清页岩油在黏土矿物纳米孔隙中的微观赋存状态与流动迁移特征,对提升非常规油藏开发效率具有重要意义。针对页岩储层中广泛存在的高岭石矿物及其界面效应,采用分子动力学模拟方法构建晶间纳米缝隙模型,模拟研究烷烃类页岩油组分在高岭石纳米孔中的赋存形态与动力学行为。研究设置不同孔径(1~8 nm)、储层温度(335.15~435.15 K)、地层压力(15~50 MPa)和驱替力大小工况,系统分析孔径、温度、压力、驱替作用等多影响因素对页岩油分子密度分布、扩散性能和界面滑移行为的影响,揭示孔隙结构、温度、压力、驱替作用下页岩油在高岭石孔隙内的演化机制。模型结果显示:高岭石纳米孔径增大促使页岩油分子在孔隙中心区域由吸附态向游离态转变,吸附层厚度与单位面积吸附量同步升高,在靠近孔壁区域形成“类固层”结构。温度升高增强分子热运动,减弱分子与孔壁之间的作用能,扩散系数提升超3倍,表明热采可有效提升页岩油的流动性。压力升高强化液-固相互作用与分子聚集趋势,分子运动受限,导致体系整体扩散能力下降约30%。在驱替作用下,页岩油呈现明显的边界滑移特征,滑移长度和平均流速随驱替力增强显著增加,揭示出驱替力可有效突破纳米限域对分子运动的限制,增强宏观流动响应。尽管流动状态变化显著,但孔壁处吸附层结构整体保持稳定,体现出黏土表面对分子层具有较强的稳定吸附能力,揭示了高岭石纳米孔隙中页岩油分子的典型赋存-运移协同机制,明确了不同热力驱动条件下分子结构与输运参数的变化规律,为黏土孔隙中的吸附控制、扩散受限与滑移渗流研究提供了分子尺度理论支撑。研究成果可为页岩油热采、驱替等提高采收率技术方案的优化提供模型基础和关键微观参数依据。

, articleAbstract=null, authors=张玉鹏1, 彭勃1, 2, 陈晓倩1, 王泽滕1, 王瑞琪1, 孙宁静1, 程凯1, 孙盈盈3, authorsList=张玉鹏, 彭勃, 陈晓倩, 王泽滕, 王瑞琪, 孙宁静, 程凯, 孙盈盈, authorCompany=null, correspAuthors=彭勃, authorNote=

张玉鹏(1999—),男,在读博士研究生,主要从事页岩油赋存特征与流动迁移机理研究、二氧化碳地质封存与利用技术及油气田化学工程方面的研究。地址:北京市昌平区府学路18号中国石油大学(北京),邮政编码:102249。E-mail:

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彭勃(1969—),男,教授,博士研究生导师,主要研究方向为油气田化学与工程、碳捕获与封存技术、石油石化污染物控制与处理、物理化学等研究工作。地址:北京市昌平区府学路18号中国石油大学(北京),邮政编码:102249。E-mail:
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张玉鹏(1999—),男,在读博士研究生,主要从事页岩油赋存特征与流动迁移机理研究、二氧化碳地质封存与利用技术及油气田化学工程方面的研究。地址:北京市昌平区府学路18号中国石油大学(北京),邮政编码:102249。E-mail:

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张玉鹏(1999—),男,在读博士研究生,主要从事页岩油赋存特征与流动迁移机理研究、二氧化碳地质封存与利用技术及油气田化学工程方面的研究。地址:北京市昌平区府学路18号中国石油大学(北京),邮政编码:102249。E-mail:

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Journal of China University of Petroleum (Edition of Natural Science), 2023, 47(4): 128-136., articleTitle=Molecular dynamics analysis on occurrence characteristics of shale oil and competitive adsorption mechanism of CO2 and oil, refAbstract=null), Reference(id=1322957375619080583, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, doi=null, pmid=null, pmcid=null, year=2022, volume=43, issue=3, pageStart=489, pageEnd=498, url=null, language=null, rfNumber=34, rfOrder=47, authorNames=王永诗, 李政, 王民, journalName=石油与天然气地质, refType=null, unstructuredReference=王永诗, 李政, 王民, 等. 渤海湾盆地济阳坳陷陆相页岩油吸附控制因素[J]. 石油与天然气地质, 2022, 43(3): 489-498., articleTitle=渤海湾盆地济阳坳陷陆相页岩油吸附控制因素, refAbstract=null), Reference(id=1322957375694578056, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, doi=null, pmid=null, pmcid=null, year=2022, volume=43, issue=3, pageStart=489, pageEnd=498, url=null, language=null, rfNumber=34, rfOrder=48, authorNames=WANG Yongshi, LI Zheng, WANG Min, journalName=Oil & Gas Geology, refType=null, unstructuredReference=WANG Yongshi, LI Zheng, WANG Min, et al. 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Oil & Gas Geology, 2022, 43(3): 489-498., articleTitle=Factors controlling lacustrine shale oil adsorption in the Jiyang Depression, Bohai Bay Basin, refAbstract=null), Reference(id=1322957375770075529, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, doi=null, pmid=null, pmcid=null, year=2019, volume=40, issue=3, pageStart=583, pageEnd=592, url=null, language=null, rfNumber=35, rfOrder=49, authorNames=李俊乾, 卢双舫, 张婕, journalName=石油与天然气地质, refType=null, unstructuredReference=李俊乾, 卢双舫, 张婕, 等. 页岩油吸附与游离定量评价模型及微观赋存机制[J]. 石油与天然气地质, 2019, 40(3): 583-592., articleTitle=页岩油吸附与游离定量评价模型及微观赋存机制, refAbstract=null), Reference(id=1322957375837184394, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, doi=null, pmid=null, pmcid=null, year=2019, volume=40, issue=3, pageStart=583, pageEnd=592, url=null, language=null, rfNumber=35, rfOrder=50, authorNames=LI Junqian, LU Shuangfang, ZHANG Jie, journalName=Oil & Gas Geology, refType=null, unstructuredReference=LI Junqian, LU Shuangfang, ZHANG Jie, et al. 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Langmuir, 2000, 16(21): 8063-8070., articleTitle=Adsorption and diffusion of supercritical carbon dioxide in slit pores, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1322957358292410624, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, xref=1, ext=[AuthorCompanyExt(id=1322957358300799233, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, companyId=1322957358292410624, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1 China University of Petroleum (Beijing), Beijing 102249,China), AuthorCompanyExt(id=1322957358313382146, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, companyId=1322957358292410624, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1 中国石油大学(北京),北京 102249)]), AuthorCompany(id=1322957358401462531, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, xref=2, ext=[AuthorCompanyExt(id=1322957358409851140, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, companyId=1322957358401462531, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2 State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China), AuthorCompanyExt(id=1322957358422434053, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, companyId=1322957358401462531, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2 中国石油大学(北京)油气资源与工程全国重点实验室,北京 102249)]), AuthorCompany(id=1322957358523097350, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, xref=3, ext=[AuthorCompanyExt(id=1322957358527291655, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, companyId=1322957358523097350, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=3 PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100089, China), AuthorCompanyExt(id=1322957358539874568, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, companyId=1322957358523097350, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=3 中国石油勘探开发研究院,北京 100089)])], figs=[ArticleFig(id=1322957363736617278, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=EN, label=Fig.1, caption=Schematic diagrams of different simulation configurations, figureFileSmall=kqXZgGQyMvLwUk+ficsHEQ==, figureFileBig=b53AwYDQGoexIvczAECZ3A==, tableContent=null), ArticleFig(id=1322957363820503359, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=CN, label=图1, caption=不同模拟构型示意图, figureFileSmall=kqXZgGQyMvLwUk+ficsHEQ==, figureFileBig=b53AwYDQGoexIvczAECZ3A==, tableContent=null), ArticleFig(id=1322957364051190080, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=EN, label=Fig.2, caption=Comparison of simulated and experimental density and viscosity of n-decane under OPLS force field at different temperatures (300~450 K), figureFileSmall=9ahXtPKyCYsUYccCLDZuzA==, figureFileBig=wei9B9V1veK6pnBZpEaEHQ==, tableContent=null), ArticleFig(id=1322957364118298945, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=CN, label=图2, caption=OPLS力场下正癸烷在不同温度(300~450 K)下密度与黏度的模拟值与实验值对比, figureFileSmall=9ahXtPKyCYsUYccCLDZuzA==, figureFileBig=wei9B9V1veK6pnBZpEaEHQ==, tableContent=null), ArticleFig(id=1322957364189602114, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=EN, label=Fig.3, caption=Mass density distribution curves and density contour plots of n-decane in kaolinite nanopores, figureFileSmall=rF6PFJZSYuuafwl18yW9gg==, figureFileBig=oiVTkYQ2nubehiJR/nFliA==, tableContent=null), ArticleFig(id=1322957364286071107, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=CN, label=图3, caption=高岭石纳米孔隙中正癸烷质量密度分布曲线合密度云图分布

注:ρ(z)为z方向局部质量密度,单位10-18 mg/nm3;z为沿z方向的距离,单位nm。

, figureFileSmall=rF6PFJZSYuuafwl18yW9gg==, figureFileBig=oiVTkYQ2nubehiJR/nFliA==, tableContent=null), ArticleFig(id=1322957364365762884, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=EN, label=Fig.4, caption=Density contour plots of alkanes under different conditions, figureFileSmall=fpa7hp3FspwLTCYLMGWTFw==, figureFileBig=9AmFxqoWpl+UmMjOylFrVw==, tableContent=null), ArticleFig(id=1322957366051873093, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=CN, label=图4, caption=不同条件下烷烃的密度云图分布

注:z为z方向的长度,单位nm;x为沿x方向的距离,单位nm。

, figureFileSmall=fpa7hp3FspwLTCYLMGWTFw==, figureFileBig=9AmFxqoWpl+UmMjOylFrVw==, tableContent=null), ArticleFig(id=1322957366148342086, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=EN, label=Fig.5, caption=Variations in interaction energy between n-decane molecules and between n-decane and kaolinite surfaces under different conditions, figureFileSmall=2Ycrtg4TO4sw/mdBV204tw==, figureFileBig=A44n9yzzAzlQ5iROwfATDQ==, tableContent=null), ArticleFig(id=1322957366232228167, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=CN, label=图5, caption=不同条件下正癸烷分子间及其与高岭石壁面间的相互作用能变化, figureFileSmall=2Ycrtg4TO4sw/mdBV204tw==, figureFileBig=A44n9yzzAzlQ5iROwfATDQ==, tableContent=null), ArticleFig(id=1322957366316114248, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=EN, label=Fig.6, caption=Radial distribution function and coordination number analysis between n-decane molecules and -OH groups on kaolinite surfaces under different conditions, figureFileSmall=dhevjoUQZtcmLmxE7C0BwA==, figureFileBig=cYyVsXE5tjWkD6l19REyYw==, tableContent=null), ArticleFig(id=1322957366433554761, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=CN, label=图6, caption=正癸烷分子与高岭石壁面-OH基团之间的径向分布函数与配位数分析

注:径向分布函数描述高岭石壁面-OH与正癸烷中-CH3/C之间的空间分布关系;配位数表示OH基团周围-CH3/C原子的平均数,反映分子间的亲和力。

, figureFileSmall=dhevjoUQZtcmLmxE7C0BwA==, figureFileBig=cYyVsXE5tjWkD6l19REyYw==, tableContent=null), ArticleFig(id=1322957366500663627, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=EN, label=Fig.7, caption=Variations in diffusion coefficient of shale oil molecules in kaolinite nanopores under different conditions, figureFileSmall=0ECXz1WwfYiO8M0Ij8GLkg==, figureFileBig=Ft85ysFgRUAyCcUGzphjIA==, tableContent=null), ArticleFig(id=1322957366567772492, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=CN, label=图7, caption=不同条件下页岩油分子在高岭石纳米孔隙中的扩散系数变化

注:Da为总体扩散系数;Dx、Dz分别为沿x、z方向的扩散系数;孔壁对z方向扩散具有显著抑制效应。

, figureFileSmall=0ECXz1WwfYiO8M0Ij8GLkg==, figureFileBig=Ft85ysFgRUAyCcUGzphjIA==, tableContent=null), ArticleFig(id=1322957366836207949, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=EN, label=Fig.8, caption=Velocity profiles of alkanes in kaolinite nanopores under different systems, figureFileSmall=WIJvZfM5SuHZFvK75fuqXw==, figureFileBig=Y9nuDdTfTA94/4fB4ZQzCw==, tableContent=null), ArticleFig(id=1322957366911705422, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=CN, label=图8, caption=不同体系下高岭石纳米孔内烷烃的速度曲线

注:ω为孔径,单位nm; T为温度,单位K; p为压力,单位MPa; F为驱替力,单位kcal/(mol·nm); z为z方向的长度,单位nm。

, figureFileSmall=WIJvZfM5SuHZFvK75fuqXw==, figureFileBig=Y9nuDdTfTA94/4fB4ZQzCw==, tableContent=null), ArticleFig(id=1322957367045923151, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=EN, label=Fig.9, caption=Slip length, apparent viscosity, and effective viscosity of alkanes in kaolinite nanopores under different systems, figureFileSmall=KZ+7A3v8tYEzOzAo/wrAtQ==, figureFileBig=40RiOGYFDTg1/zNBa+rxqg==, tableContent=null), ArticleFig(id=1322957367125614928, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=CN, label=图9, caption=不同体系下高岭石纳米孔内烷烃的滑移长度、视黏度、有效黏度

注:Ls为滑移长度,单位nm;ηapp为视黏度,单位mPa·s;ηeff为有效黏度,单位mPa·s;Ls(fit)为滑移长度拟合;ηapp(fit)为视黏度拟合;ηeff(fit)为有效黏度拟合。

, figureFileSmall=KZ+7A3v8tYEzOzAo/wrAtQ==, figureFileBig=40RiOGYFDTg1/zNBa+rxqg==, tableContent=null), ArticleFig(id=1322957367213695313, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=EN, label=Fig.10, caption=Multi-factor regulatory model of shale oil occurrence and flow mechanisms in kaolinite nanopores, figureFileSmall=F6Nx3KxHAjiVzIb68vsNmg==, figureFileBig=/zjP4XWncynf/UiXV5yjjw==, tableContent=null), ArticleFig(id=1322957367326941522, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=CN, label=图10, caption=高岭石纳米孔隙中页岩油赋存与流动机制的多因素调控模型, figureFileSmall=F6Nx3KxHAjiVzIb68vsNmg==, figureFileBig=/zjP4XWncynf/UiXV5yjjw==, tableContent=null), ArticleFig(id=1322957367406633299, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=EN, label=Table 1, caption=Force field parameters for kaolinite and n-decane (C10H22), figureFileSmall=null, figureFileBig=null, tableContent=
类别原子连接方式Q/eε/(kcal/mol)σ/nm
高岭石Al-Al-1.5751.329 8×10-60.427 13
Si-Si-2.1001.840 5×10-60.330 20
O-O--1.0500.155 400.316 55
O-OH-0.9500.155 400.316 55
H-OH0.42500
正癸烷CCH3--0.1800.066 000.350 00
C-CH2--0.1200.066 000.350 00
HH-C0.0600.026 290.250 00
), ArticleFig(id=1322957367494713684, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=CN, label=表1, caption=

高岭石与正癸烷力场参数

, figureFileSmall=null, figureFileBig=null, tableContent=
类别原子连接方式Q/eε/(kcal/mol)σ/nm
高岭石Al-Al-1.5751.329 8×10-60.427 13
Si-Si-2.1001.840 5×10-60.330 20
O-O--1.0500.155 400.316 55
O-OH-0.9500.155 400.316 55
H-OH0.42500
正癸烷CCH3--0.1800.066 000.350 00
C-CH2--0.1200.066 000.350 00
HH-C0.0600.026 290.250 00
), ArticleFig(id=1322957367570211157, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=EN, label=Table 2, caption=Adsorption capacity of kaolinite surfaces for n-decane under different conditions, figureFileSmall=null, figureFileBig=null, tableContent=
不同孔径不同温度不同压力
孔径/nm吸附层厚度/nm单位面积吸附量/(10-18 mg/nm2)温度/K吸附层厚度/nm

单位面积吸附量/

(10-18 mg/nm2)

压力/MPa吸附层厚度/nm单位面积吸附量/(10-18 mg/nm2)
10.580.384335.151.851.305151.821.251
21.090.721360.151.851.276201.821.258
41.851.186385.151.851.248301.821.274
61.861.193410.151.851.221401.821.289
81.891.243435.151.851.194501.821.307
), ArticleFig(id=1322957367670874454, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322957354173604073, language=CN, label=表2, caption=

不同条件下高岭石壁面对正癸烷的吸附能力

, figureFileSmall=null, figureFileBig=null, tableContent=
不同孔径不同温度不同压力
孔径/nm吸附层厚度/nm单位面积吸附量/(10-18 mg/nm2)温度/K吸附层厚度/nm

单位面积吸附量/

(10-18 mg/nm2)

压力/MPa吸附层厚度/nm单位面积吸附量/(10-18 mg/nm2)
10.580.384335.151.851.305151.821.251
21.090.721360.151.851.276201.821.258
41.851.186385.151.851.248301.821.274
61.861.193410.151.851.221401.821.289
81.891.243435.151.851.194501.821.307
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高岭石纳米限域下页岩油赋存与流动机制的分子动力学研究
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张玉鹏 1 , 彭勃 1, 2 , 陈晓倩 1 , 王泽滕 1 , 王瑞琪 1 , 孙宁静 1 , 程凯 1 , 孙盈盈 3
油气藏评价与开发 | 油气开发 2026,16(2): 363-373
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油气藏评价与开发 |油气开发 2026 , 16 (2) : 363 -373
高岭石纳米限域下页岩油赋存与流动机制的分子动力学研究
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张玉鹏(1999—),男,在读博士研究生,主要从事页岩油赋存特征与流动迁移机理研究、二氧化碳地质封存与利用技术及油气田化学工程方面的研究。地址:北京市昌平区府学路18号中国石油大学(北京),邮政编码:102249。E-mail:

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张玉鹏(1999—),男,在读博士研究生,主要从事页岩油赋存特征与流动迁移机理研究、二氧化碳地质封存与利用技术及油气田化学工程方面的研究。地址:北京市昌平区府学路18号中国石油大学(北京),邮政编码:102249。E-mail:

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张玉鹏1 , 彭勃1, 2, 陈晓倩1, 王泽滕1, 王瑞琪1, 孙宁静1, 程凯1, 孙盈盈3
作者信息
  • 1 中国石油大学(北京),北京 102249
  • 2 中国石油大学(北京)油气资源与工程全国重点实验室,北京 102249
  • 3 中国石油勘探开发研究院,北京 100089
通讯作者:
彭勃(1969—),男,教授,博士研究生导师,主要研究方向为油气田化学与工程、碳捕获与封存技术、石油石化污染物控制与处理、物理化学等研究工作。地址:北京市昌平区府学路18号中国石油大学(北京),邮政编码:102249。E-mail:
作者简介:

张玉鹏(1999—),男,在读博士研究生,主要从事页岩油赋存特征与流动迁移机理研究、二氧化碳地质封存与利用技术及油气田化学工程方面的研究。地址:北京市昌平区府学路18号中国石油大学(北京),邮政编码:102249。E-mail:

Molecular dynamics study on occurrence and flow mechanisms of shale oil under kaolinite nanoconfinement
YUPENG ZHANG1 , BO PENG1, 2, XIAOQIAN CHEN1, ZETENG WANG1, RUIQI WANG1, NINGJING SUN1, KAI CHENG1, YINGYING SUN3
Affiliations
  • 1 China University of Petroleum (Beijing), Beijing 102249,China
  • 2 State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
  • 3 PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100089, China
出版时间: 2026-03-26 doi: 10.13809/j.cnki.cn32-1825/te.2025391
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高岭石  /  纳米孔隙  /  页岩油  /  分子动力学模拟  /  吸附能力  /  流动规律
kaolinite  /  nanopores  /  shale oil  /  molecular dynamics simulation  /  adsorption capacity  /  flow pattern
张玉鹏, 彭勃, 陈晓倩, 王泽滕, 王瑞琪, 孙宁静, 程凯, 孙盈盈. 高岭石纳米限域下页岩油赋存与流动机制的分子动力学研究. 油气藏评价与开发, 2026 , 16 (2) : 363 -373 . DOI: 10.13809/j.cnki.cn32-1825/te.2025391
YUPENG ZHANG, BO PENG, XIAOQIAN CHEN, ZETENG WANG, RUIQI WANG, NINGJING SUN, KAI CHENG, YINGYING SUN. Molecular dynamics study on occurrence and flow mechanisms of shale oil under kaolinite nanoconfinement[J]. Petroleum Reservoir Evaluation and Development, 2026 , 16 (2) : 363 -373 . DOI: 10.13809/j.cnki.cn32-1825/te.2025391
在全球能源需求持续增长和常规石油资源日益枯竭的背景下,化石能源在世界能源供给体系中不可或缺[1-2]。近年来,页岩油逐渐成为应对能源危机的重要资源与战略选择[3]。页岩油以纳米级孔隙为主要赋存空间,孔隙结构复杂且组成多样,赋存与流动行为表现出显著特殊性,直接影响高效开发[4-7]。因此,揭示纳米限域条件下页岩油的赋存与流动机制已成为研究热点。页岩储层孔隙结构复杂、非均质性强,既包含有机质(如干酪根),也包含无机矿物(如石英、黏土矿物等),孔隙类型多样,包括有机孔、晶间孔、粒间孔及次生溶蚀孔等[8-9]。其中黏土矿物作为主要组分,种类繁多、性质各异,其在影响页岩油赋存状态与流动性方面的作用尚未全面揭示[10]。明确黏土矿物对页岩油赋存与流动行为的影响,对于高效开采页岩油资源具有重要意义。
近年来,页岩油在纳米孔隙中的赋存与流动研究取得进展,主要依赖于图像分析、岩石物理表征、地球化学实验、渗流实验、数值模拟和分子动力学模拟等多种技术[11-13]。图像分析和显微表征揭示了页岩油存在吸附态与游离态2种赋存形式[14-15]。溶胀与吸附实验表明黏土矿物对页岩油具有明显吸附能力,平均吸附量介于19.56~25.67 mg/g[16]。随着页岩油赋存与流动机制研究的不断深入,实验技术手段已可探测储层孔隙结构、流体赋存状态及可动性,但在分子尺度、吸附层演化及流体-固体分子间作用机制等方面仍存在直接观测困难。分子动力学模拟方法基于分子力学与经典动力学原理,可追踪粒子运动轨迹并精确表征界面作用,已成为研究纳米限域流体行为的重要手段[17-18]。分子动力学模拟研究发现:正辛烷在石墨烯和石英纳米孔隙中更容易吸附在润湿度较低的壁面[16,19];纳米级有机质狭缝与二氧化硅矿物狭缝中的吸附对比发现石墨烯的吸附能力是石英的1.31倍[20];滑移长度和有效黏度可以有效表征纳米孔隙中烷烃的流动行为[21];石英和石墨烯等理想刚性壁面体系的分子模拟可揭示孔径、润湿性与外力对吸附、扩散和滑移的调控规律[22-23]。然而,对于页岩储层中普遍存在的自生黏土矿物——高岭石,其复杂表面结构、电荷分布、极性官能团对页岩油分子赋存与流动的影响仍缺乏系统研究。
结合高岭石的结构特性实验与理论研究成果[14,16],采用分子动力学模拟方法,系统分析了高岭石纳米孔隙中页岩油的赋存状态与流动行为,重点分析了孔径、温度、压力及驱替作用等多因素对分子行为的调控作用。研究旨在填补高岭石孔隙特征-多场因素-分子行为之间的关联机理空白,为揭示纳米效应对页岩油赋存和流动的调控规律提供理论依据,为页岩油高效开发提供新思路与参考。
模拟过程基于美国Sandia(桑迪亚)国家实验室开发的LAMMPS(大规模原子分子并行模拟器)[24],所用力场为验证可靠性的OPLS(优化液体模拟势能函数)通用力场。相关研究表明,该力场在小分子烷烃热力学性质及界面行为模拟中具有良好表现[25-26],可准确描述纳米限域下烷烃与无机壁面之间的相互作用。
页岩无机质黏土矿物成分繁多且结构复杂,难以从微观尺度对其结构进行准确解析。为模拟页岩中典型黏土矿物孔隙结构,研究选用国际普遍使用的高岭石构建双层晶间狭缝模型[20-21],并对其采用clayFF力场进行模拟。模型的初始结构由Packmol和Moltemplate程序生成[27-28],沿z方向(001)晶面切割构建单壁面结构,添加0.1 nm真空层,沿x、y、z方向分别进行12×6×2超胞扩展,形成单层盒子,尺寸为12.35 nm×5.36 nm×1.28 nm。下壁面结构通过旋转180°后与上壁面组合,构建对称型孔隙体系。为确保壁面厚度大于力场截断半径,设置不同孔径(1、2、4、6、8 nm),其中,6 nm模型用于后续温度、压力与驱替力影响分析(图1)。页岩油选取正癸烷分子,参考美国NIST标准数据库确定正癸烷密度,并依据孔隙体积计算分子数量,构建页岩油体系。
模拟体系首先通过共轭梯度法进行能量最小化,获得稳定构型。使用Nosé-Hoover温度耦合方法[26]控制体系温度,时间步长设定为1 fs。周期性边界条件作用于x、y、z三个方向。非键势能由范德华作用和静电相互作用进行描述:范德华作用采用12-6型Lennard-Jones势,截断半径设为1.4 nm,静电相互作用通过PPPM(在分子动力学里高效计算长程库仑相互作用的方法)。
U=ULJ(rij)+UCoul=4εijσijrij12-σijrij6+qiqj4πε0rij
式中:U为粒子i和粒子j之间的总势能,单位kcal/mol;ULJ(rij)为粒子i和粒子j之间的范德华相互作用势能,单位kcal/mol;rij为i和粒子j之间的实际距离,单位nm;ε0表示真空介电常数;Ucoul为粒子i和粒子j之间的静电相互作用势能,单位kcal/mol;εij为粒子i和粒子j之间的势阱深度,表示两粒子间相互作用势能的最小值,单位kcal/mol;σij为当两粒子间势能为零时间距,代表粒子间的有效直径,单位nm;qi和qj分别表示位点i与位点j的电荷,均以e为单位表示。
页岩油体系与窄缝体系通过Lorentz-Berthelot混合规则计算,其中,相互作用距离参数与能量参数由下式确定:
εij=εiεj
σij=σi+σj2
式中:εi和εj分别为位点i和位点j的“自参数”,单位kcal/mol;σi和σj分别为位点i和位点j的“自参数”,单位nm。
体系经NVT正则系综弛豫平衡后开始采集数据[29-31],在LAMMPS模拟器上进行模拟,模拟总时间为15 ns,数据采集窗口为5 ns,采样间隔1 ps。模拟流体的流动行为时,对模型内构成正癸烷(n-C10H22)的每一个拟原子施加一个x方向的外力(表1)。模拟外部驱替力,该驱替力的大小参考了已有研究中在石英窄缝中辛烷流动研究中对辛烷分子施加外力的设定,确保模拟条件具备合理性与可比性[21]。设置驱替力可以更好地模拟流体在实际开发中因外部扰动能(如注热、气体驱替等)引起的流动行为,模拟得到的数据,采用VMD软件后处理[32]。
计算高岭石窄缝中烷烃的密度分布时,将z方向划分为厚度为0.05 nm的单元格,统计局部质量密度为:
ρmass(z)=∑MiAΔzNA
式中:ρmass(z)为局部质量密度,单位mg/nm3;Mi为粒子的摩尔质量,单位g/mol;A为模型的横截面积,单位nm2;Δz为单元格厚度,单位nm;NA为阿伏伽德罗常数。
单位面积吸附量计算公式为:
Cadsorption=1S∫z1z2ρ(z)dz
式中:Cadsorption为单位面积吸附质量,单位mg/nm2;S为壁面面积,单位nm2;z1和z2为吸附层起止位置,单位nm;d为微分;z为壁面法向距离,单位nm。
页岩油与壁面之间的相互作用可以直观地反映页岩油的吸附能力,相互作用能的计算公式为[33]:
Einteraction=Etotal-Efluid-Ewall
式中:Einteraction为相互作用能,单位kJ/mol;Etotal为壁面和原油系统的能量,单位kJ/mol;Efluid为仅含流体时的体系能量,单位kJ/mol;Ewall为仅含壁面时的体系能量,单位kJ/mol。
径向分布函数用于刻画特定原子对之间的空间分布概率,研究统计高岭石壁面-OH与正癸烷中-CH3/C之间的径向分布函数:
g(r)=N(r+Δr)4πr2Δrρ
式中:g(r)为径向分布函数,描述粒子在距离r附近的概率密度;N(r+Δr)为距离在r与r+Δr范围内的粒子平均数目,r为距离参考粒子的径向距离,单位nm;Δr为壳层厚度,即径向间隔,单位nm;ρ为整体系统的密度,单位nm-3。
通过计算分子重心在模拟时间内的位移均值,评估其运动能力。SMSD和扩散系数的公式如下:
SMSD=1n∑i=1nri(t)-ri(0)2
根据Einstein关系,分子扩散系数D为:
D=16∂∂t(SMSD)
式中:SMSD为均方位移,描述粒子平均运动能力的度量,单位nm2;n为参与统计的粒子数目;ri(t)为第i个粒子在时间t时刻的位置矢量,单位nm;ri(0)为第i个粒子在初始时刻的位置矢量;D为扩散系数,单位m2/s;t为时间,单位10-9 s。
将纳米孔隙划分为多个微元,提取速度剖面并用拟合公式描述流速分布:
v(z)=ax2+bx+c
式中:a为二次多项式的系数,控制曲线“弯曲程度/曲率”(抛物线开口大小与方向);b为一次多项式的系数,控制曲线整体的“倾斜”;c为当z为0时的速度,即峰值速度,单位m/s。x为空间位置坐标,通常是孔壁法向距离(从壁面到孔中心的距离),单位nm。
在壁面处取速度剖面的切线,把这条切线向壁面外侧(或内侧)延长,直到速度外推到0的位置;从壁面到这个“外推零速点”的距离就是滑移长度,计算公式为:
Ls=-v(zsurf)(dv/dz)zsurf
式中:Ls为滑移长度,单位nm;v为速度,单位nm/s;zsurf为固体壁面的位置。
经典Poiseuille方程可以用来描述2个高岭石壁面(宽度为w)内不可压缩层状流体的稳态速度剖面。有效黏度与视黏度公式分别为:
ηeff=-nF/2a
ηapp=11+6Ls/dηeff
式中:ηeff为有效黏度,单位mPa·s;n为孔隙中组成分子流体的粒子数;F为流体处于稳态流动,每摩尔粒子所受的黏性阻力与外加驱动力大小相等方向相反,且与流动方向相反,单位Kcal/(mol·nm);ηapp为视黏度,单位mPa·s;d为高岭石窄缝尺寸,单位nm。
选取正癸烷(n-C10H22)为代表组分,在300~450 K的温度条件下,开展体相正癸烷的密度与黏度模拟,验证所采用力场参数与分子模型的可靠性。将图2模拟值与NIST数据库中对应的实验数据进行对比,其中,密度模拟值与实验值高度吻合,最大偏差不超过2.5%,黏度在整体趋势上与实验结果一致,偏差在允许范围内,这说明研究中所采用的分子模型与力场参数能够准确刻画目标体系在不同热力条件下的物性行为,可为后续纳米孔隙中页岩油赋存与流动模拟提供可靠模型参数依据。
高岭石纳米孔隙中页岩油的赋存状态随孔径、温度和压力等物理条件变化显著。图3显示了不同工况下正癸烷的质量密度分布曲线,图4为对应的密度云图分布,表2则汇总了吸附层厚度和单位面积吸附量的变化情况。
在孔径为1~8 nm时,系统中出现明显的吸附-游离双态分布,吸附层数量与厚度均显著增加,外层密度峰值从1.13×10-18 mg/nm3增至1.51×10-18 mg/nm3,为体相密度(0.658×10-18 mg/nm3)的2.294倍,表明形成“类固层”高密结构。页岩油吸附层密度随孔径增大而变化的趋势与前人针对其他无机矿物孔隙的分子模拟结果相一致[34-35]。单位面积吸附量随孔径从0.384×10-18 mg/nm2提升至1.243×10-18 mg/nm2(表2)。温度升高时(图3b、图4b),分子热运动增强,吸附能力下降。外层密度峰值由1.72×10-18 mg/nm3降至1.39×10-18 mg/nm3,对应单位面积吸附量由1.305×10-18 mg/nm2降至1.194×10-18 mg/nm2(表2)。尽管多层吸附结构仍存在,但吸附层密度减弱,说明温度上升促使页岩油从壁面解吸向孔隙中心迁移。在不同压力条件下(图3c、图4c),系统密度分布形态整体稳定。外层密度峰值由1.61×10-18 mg/nm3升至1.73×10-18 mg/nm3,单位面积吸附量略有增加,介于(1.251~1.307)×10-18 mg/nm2(表2),显示压力可增强液-固作用,但其对吸附层结构的敏感性弱于孔径和温度[36]。
图5显示了不同孔径、温度和压力条件下页岩油分子与高岭石壁面之间的相互作用能(Einteraction)及分子内聚能(Efluid)的变化趋势。随着孔径由1 nm增至8 nm(图5a),Einteraction值先减小后趋于稳定,从-4 937.66 kJ/mol下降至-6 137.80 kJ/mol,说明页岩油分子与壁面之间的相互作用增强后达到饱和。与此同时,Efluid由-2 471.53 kJ/mol大幅下降至-45 045.36 kJ/mol,表明体系中页岩油分子的聚集能力显著增强,吸附态比例下降,游离态比例提升,吸附层数增加,展现出多层吸附的赋存状态。当温度升高(图5b),Einteraction从-6 868.95 kJ/mol上升至-5 834.16 kJ/mol,显示油分子与壁面之间的吸附作用被热运动削弱。Efluid由-43 055.87 kJ/mol升至-29 250.55 kJ/mol,表明分子聚集性下降,系统整体呈现更分散、更易流动的状态,验证了热采条件下页岩油脱附能力增强的微观机制。在压力升高的情况下(图5c),Einteraction略微下降(-6 410.09 kJ/mol到-6 832.43 kJ/mol),说明外部压力有助于增强油-壁面相互作用;Efluid由-37 218.39 kJ/mol降低至-42 473.03 kJ/mol,表明页岩油分子在压缩驱动下更易发生聚集,赋存状态趋于稳定但流动性降低。
图6展示了高岭石壁面-OH基团与正癸烷中-CH3/C原子之间的径向分布函数(RDF)及配位数的变化。随着孔径增大(图6a),RDF峰值减弱,配位数由0.592降至0.272,反映出壁面-OH与油分子之间的空间关联程度降低,吸附程度减弱;在温度升高时(图6b),RDF峰值逐渐降低,配位数由0.318下降至0.284,显示热运动削弱了吸附亲和力;在压力增加条件下(图6c),RDF峰值增强,配位数由0.325升至0.346,说明压力促使油分子向孔壁靠近,强化吸附能力。孔径增大会促使赋存形态从吸附主导转向游离堆积,温度升高有助于赋存解离和流动性提升,而压力则增强了吸附与聚集,表现出较强的“压缩吸附”特征。
图7展示了不同条件下页岩油在高岭石纳米孔隙内的分子扩散系数在不同方向上的变化。总体扩散系数由1.22×106 nm2/s增至1.82×106 nm2/s,提升约1.49倍,反映孔径扩大消弱了限域效应(图7a),增强分子迁移自由度,3个方向扩散规律为Da>Dx>Dz,表明孔壁对z方向的限制最强,表现出明显的各向异性特征。温度升高同样促进扩散(图7b),当温度从335.15 K升至435.15 K,总体扩散系数值从0.608×106 nm2/s提升至1.930×106 nm2/s,提升3.18倍。升温增强分子热运动并削弱壁面吸附,显著提高扩散效率,验证了热采在微观尺度改善可动性的有效性。压力作用则相反(图7c),当压力由15 MPa升至50 MPa时,总体扩散系数由1.02×106 nm2/s下降至0.712×106 nm2/s,下降幅度约为30%,较高压力增强分子与壁面之间的相互作用,导致局部吸附和聚集,从而限制整体扩散能力。总体而言,孔径与温度对扩散具有促进作用,而压力通过抑制分子运动发挥负面影响,体现了热力学条件对纳米限域扩散行为的显著调控效应。
页岩油在高岭石纳米孔隙中的流动规律受孔径、温度、压力及外力驱动等多因素控制(图8、图9)。页岩油的流动速度随着孔径增大呈现显著提升趋势,孔径从1 nm增至8 nm时,滑移流速从17.72×109 nm/s增至41.92×109 nm/s。较大孔径削弱了分子与孔壁的作用力,降低流动阻力,增强了分子运动自由度和流动效率(图8a)。温度升高同样显著促进流动(图8b),升温增强分子热运动,削弱壁面吸附,促进分子脱附与迁移,从而提升整体流动性,在335.15 K至435.15 K时滑移流速增幅约2.8倍,从10.87×109 nm/s提升至30.15×109 nm/s。验证了热采技术在微观尺度的有效性。相比之下,压力升高则表现出抑制效应(图8c),当压力从15 MPa增至50 MPa时,滑移流速从17.72×109 nm/s下降至10.60×109 nm/s,下降幅度显著。高压环境强化了分子间及分子与壁面的吸附与作用,增加局部束缚,从而降低流体流动能力。外力驱动的作用尤为突出(图8d),随着驱替力增大,滑移流速最高提升约2.8倍,表明驱替力可有效克服界面滑移阻力,显著提高流动效率,但对分子吸附状态影响有限。
研究进一步揭示了不同条件下的滑移长度、有效黏度和视黏度特征,结果表明:孔径增大使滑移长度由1.013 nm减少至0.869 nm(图9a),说明孔隙尺寸越小非达西流动效应越强,页岩油流动能力越小;温度升高导致流体的有效黏度下降(图9b);压力升高则使有效黏度增加(图9c),表明压力增强了流体的黏滞性并抑制流动;驱替力变化对黏度影响不大,但能显著增加滑移长度(图9d),进一步证明外力可有效改善纳米限域下的流动性能。
综上所述,页岩油在纳米孔隙中的流动行为表现为:孔径增大、温度升高和外力驱动均有利于提高流动性,而高压则增强分子作用并限制流动。该规律揭示了多物理条件对流动的耦合作用机制,为热采与驱替等提高采收率方法的微观机制提供了理论依据。
图10直观展示了高岭石纳米孔隙中页岩油赋存与流动机制的多因素影响特征,揭示了孔径、温度、压力与驱替力对油-壁相互作用及微观行为的调控路径。四类因素均通过改变油-壁面作用能与分子排布方式,进而影响页岩油的吸附状态与流动能力。其中,孔径作为结构性因素,决定了油-壁接触面积和分子排列空间;温度与压力作为热力学因素,分别增强分子热运动或致密分布,从而调节界面相互作用;驱替力则作为外在动力因素,通过强制流动改变滑移与扩散特征。四者共同作用于油-壁面,协同调控吸附层结构、扩散性能与滑移行为,构成页岩油在纳米孔隙中赋存-运移演化机制的核心机制(图10a)。基于模拟结果,图10b进一步总结了多因素条件下页岩油吸附与流动的耦合演化过程,为认识纳米限域体系中的流动机理提供了系统框架。
研究基于分子动力学模拟方法,结合高岭石矿物结构特性,系统分析了正癸烷在高岭石纳米孔隙中的赋存状态与流动行为,重点探讨了孔径、温度、压力及驱替力等因素的影响规律,主要结论如下:
1) 孔径变化显著影响页岩油的赋存状态。随着孔径由1 nm增大至8 nm,油分子由吸附态逐步向游离态过渡,形成“类固层”结构,吸附层密度峰值增高,单位面积吸附量随之增加。
2) 温度升高(335.15~435.15 K)弱化油-壁面作用,导致吸附能力减弱,同时分子热运动增强,扩散系数提升超过3倍,扩散能力显著增强。
3) 在15~50 MPa压力范围内,高压环境增强分子间聚集趋势,页岩油分子的扩散系数降低约30%,整体流动性受到抑制。
4) 驱替力的施加可有效克服纳米限域下的流动阻力,提升滑移流速,增幅最高提升约2.8倍,驱替过程对吸附结构影响较小,主要通过增强动能促进流动行为,从而提升整体流动性。
5) 构建了多物理场(孔径、温度、压力、驱替力)作用下的油-壁面调控模型,明确了各因素的功能层级:孔径为界面构型基础,温度与压力为热力内因,驱替力为外部动力源,四者协同作用于油-壁面,控制赋存结构与流动响应。

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2026年第16卷第2期
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doi: 10.13809/j.cnki.cn32-1825/te.2025391
  • 接收时间:2025-09-17
  • 首发时间:2026-10-30
  • 出版时间:2026-03-26
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  • 收稿日期:2025-09-17
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    1 中国石油大学(北京),北京 102249
    2 中国石油大学(北京)油气资源与工程全国重点实验室,北京 102249
    3 中国石油勘探开发研究院,北京 100089

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彭勃(1969—),男,教授,博士研究生导师,主要研究方向为油气田化学与工程、碳捕获与封存技术、石油石化污染物控制与处理、物理化学等研究工作。地址:北京市昌平区府学路18号中国石油大学(北京),邮政编码:102249。E-mail:
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2种不同金属材料的力学参数
科
Family
属数
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genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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