Article(id=1322964814800233327, tenantId=1146029695717560320, journalId=1322258508890079423, issueId=1322964647376191536, articleNumber=null, orderNo=null, doi=10.13809/j.cnki.cn32-1825/te.2025053, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1737648000000, receivedDateStr=2025-01-24, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1793348991346, onlineDateStr=2026-10-30, pubDate=1769356800000, pubDateStr=2026-01-26, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1793348991346, onlineIssueDateStr=2026-10-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1793348991346, creator=13701087609, updateTime=1793348991346, updator=13701087609, issue=Issue{id=1322964647376191536, tenantId=1146029695717560320, journalId=1322258508890079423, year='2026', volume='16', issue='1', pageStart='1', pageEnd='224', issueExtLink='null', onlineDate='null', pubDate='1769356800000', pubDateStr='2026-01-26', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1793348951428, creator='13701087609', updateTime=1793349012150, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1322964902113063080, tenantId=1146029695717560320, journalId=1322258508890079423, issueId=1322964647376191536, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1322964902113063081, tenantId=1146029695717560320, journalId=1322258508890079423, issueId=1322964647376191536, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=107, endPage=117, ext={EN=ArticleExt(id=1322964816788333424, articleId=1322964814800233327, tenantId=1146029695717560320, journalId=1322258508890079423, language=EN, title=Characterization of crude oil mobilization under advanced CO2 injection in tight oil of Chang 8 member, Ordos Basin, columnId=1322964648311533732, journalTitle=Petroleum Reservoir Evaluation and Development, columnName=Methodological Theory, runingTitle=null, highlight=

The poor physical properties and low pressure coefficient of tight oil reservoirs make it difficult to directly apply the advanced water injection development technology, which has been successfully used in low-permeability oil reservoirs, to tight oil reservoirs. The advanced CO2 injection technology, as an emerging method for enhancing oil recovery, has received increasing attention. However, its microscopic oil displacement characteristics and enhanced oil recovery effectiveness require further investigation. Therefore, core samples from the Chang 8 member reservoir of the west 331 block in the Ordos Basin were selected. Experiments including water flooding, CO2 flooding at different pressures, and advanced CO2 injection flooding at different pressures were conducted using nuclear magnetic resonance (NMR) technology. The oil recovery characteristics and microscopic mobilization characteristics under different development methods were clarified. Meanwhile, a calculation model for the mobilization lower limit was established based on the capillary model, and the pore mobilization lower limits under different development methods were obtained. The experimental results showed that the oil recovery of water flooding was about 40%, with the oil primarily produced from macropores, while meso- and micropores exhibited poor mobilization. Compared with water flooding, the oil recovery of supercritical CO2 flooding was higher and increased with the injection pressure, reaching 76% under miscible conditions. The advanced CO2 injection flooding further enhanced the recovery rate, achieving 87% when the pressure reached 1.2 times the miscible pressure, with meso- and micropores contributing 14.1% of the recovery—approximately 1.5 times that of miscible flooding. After water flooding and non-miscible CO2 flooding, the remaining oil was mainly in the form of continuous remaining oil, with a considerable amount still present at the core outlet end. As the CO2 flooding pressure increased, the crude oil saturation decreased significantly, and the continuous remaining oil diminished, resulting in more isolated oil droplets. After advanced CO2 injection flooding, the crude oil saturation further declined, and the large area of continuous remaining oil significantly reduced, primarily manifesting as isolated oil droplets and small clusters of continuous remaining oil. The mobilization lower limit of water flooding was 200 nm, and the pore mobilization lower limits of CO2 flooding and advanced CO2 injection flooding decreased with increasing injection pressure. Advanced CO2 injection flooding can mobilize crude oil in 20 nm pores.

, articleAbstract=null, authors=JIWEI WANG1, 2, JIAN LIU1, 2, XUANRU WANG1, 2, LUMING SHI1, 2, DONG HAO1, 2, PENG SONG1, 2, JITIAN REN3, WENLIAN XIAO3, authorsList=JIWEI WANG, JIAN LIU, XUANRU WANG, LUMING SHI, DONG HAO, PENG SONG, JITIAN REN, WENLIAN XIAO, authorCompany=null, correspAuthors=WENLIAN XIAO, 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=1322964822773605257, articleId=1322964814800233327, tenantId=1146029695717560320, journalId=1322258508890079423, language=CN, title=鄂尔多斯盆地长8段致密油超前注CO2驱原油动用特征, columnId=1322964648462528678, journalTitle=油气藏评价与开发, columnName=方法理论, runingTitle=null, highlight=

致密油藏物性差和压力系数低的特点使得低渗透油藏成功应用的超前注水开发技术难以直接移植到致密油藏。超前注CO2技术作为一种新兴提高采收率的方法受到关注,然而其微观驱油特征和提高采收率效果仍有待研究。为此,选取鄂尔多斯盆地西331区块长8段储层岩心,结合核磁共振技术完成了水驱、不同压力的CO2驱和不同压力的超前注CO2驱实验,明确了不同开发方式下的采收率特征和微观动用特征。同时,根据毛细管模型建立了动用下限计算模型,获取了不同开发方式的孔隙动用下限。实验结果表明,水驱采收率在40%左右,原油主要来自于大孔隙,中小孔隙动用效果较差;相比水驱,超临界CO2驱采收率更高,且随着驱替压力的增加而增加,混相驱采收率为76%;超前注CO2驱替进一步提高了采收率,压力达到混相压力的1.2倍时,采收率为87%,中小孔采收率达到了14.1%,约为混相驱的1.5倍;水驱和CO2非混相驱后剩余油以连片剩余油为主,岩心出口端剩余油仍然较多;随着CO2驱压力的增加,原油饱和度下降明显,且连片剩余油减少,表现更多孤立油滴;超前注CO2驱后,原油饱和度进一步下降,且大面积的连片剩余油明显减少,主要表现为孤立油滴和小连片聚集的剩余油;水驱孔喉动用下限为194 nm,CO2驱和超前注CO2驱孔隙动用下限随着注入压力的增加而降低,超前注CO2驱可动用20 nm孔隙内原油。

, articleAbstract=null, authors=王继伟1, 2, 刘建1, 2, 王选茹1, 2, 石璐铭1, 2, 郝栋1, 2, 宋鹏1, 2, 任吉田3, 肖文联3, authorsList=王继伟, 刘建, 王选茹, 石璐铭, 郝栋, 宋鹏, 任吉田, 肖文联, authorCompany=null, correspAuthors=肖文联, authorNote=

王继伟(1986—),男,硕士研究生,工程师,主要从事油气地质与开发方面的研究工作。地址:陕西省西安市未央区长庆兴隆园小区勘探开发研究院,邮政编码:710018。E-mail:

, correspAuthorsNote=
肖文联(1983—),男,博士,教授,从事非常规油气渗流物理及其在油气田开发中应用的教学和科研工作。地址:四川省成都市新都区西南石油大学,邮政编码:610500。E-mail:
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王继伟(1986—),男,硕士研究生,工程师,主要从事油气地质与开发方面的研究工作。地址:陕西省西安市未央区长庆兴隆园小区勘探开发研究院,邮政编码:710018。E-mail:

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王继伟(1986—),男,硕士研究生,工程师,主要从事油气地质与开发方面的研究工作。地址:陕西省西安市未央区长庆兴隆园小区勘探开发研究院,邮政编码:710018。E-mail:

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注:a为发育粒间孔和长石溶蚀孔,铸体薄片;b为局部发育粒间孔和溶蚀孔,片状喉道,铸体薄片;c为发育长石溶蚀孔,片状和缩颈喉道,铸体薄片;d为粒间孔被绿泥石充填,片状喉和管束喉道,扫描电镜;e为粒间孔,扫描电镜;f为粒间孔充填高岭石,片状喉和管束喉道,扫描电镜

, figureFileSmall=iL+asRe1UTB5cYO1EhVgvQ==, figureFileBig=zpvQXw+Pp4y5wf3Q9WbOxg==, tableContent=null), ArticleFig(id=1322964836082131917, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322964814800233327, language=EN, label=Fig.2, caption=High-pressure mercury injection results for Chang 8 member tight oil, figureFileSmall=bPZDm7EdceBDaOuqEsJSpg==, figureFileBig=XxJi5fP0By5BhY1HSBXSZA==, tableContent=null), ArticleFig(id=1322964836157629390, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322964814800233327, language=CN, label=图2, caption=长8段致密油高压压汞情况, figureFileSmall=bPZDm7EdceBDaOuqEsJSpg==, figureFileBig=XxJi5fP0By5BhY1HSBXSZA==, tableContent=null), ArticleFig(id=1322964836241515471, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322964814800233327, language=EN, label=Fig.3, caption=Test results of minimum miscibility pressure, figureFileSmall=E0IYVzaMwoRUooOKAK9vVw==, figureFileBig=5CSuSUeO7YIuHBAzk3hWHw==, 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properties of core samples in Chang 8 member,Ordos Basin, figureFileSmall=null, figureFileBig=null, tableContent=
序号岩心编号样品直径/cm样品长度/cm孔隙度/%渗透率/10-3 μm2实验方案实验压力/MPa
1L408-22.524.929.270.29CO2驱15
2L89-12.524.0510.900.39CO2驱20
3Z82-22.504.1111.820.25CO2驱10
4Z288-22.515.078.150.20超前注气20
5Z288-52.505.087.320.16超前注气18
6Z452-42.505.068.430.20超前注气22
7Z273-12.515.068.830.21水驱5
), ArticleFig(id=1322964840393876452, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322964814800233327, language=CN, label=表1, caption=

鄂尔多斯盆地长8段岩心基本物性

, figureFileSmall=null, figureFileBig=null, tableContent=
序号岩心编号样品直径/cm样品长度/cm孔隙度/%渗透率/10-3 μm2实验方案实验压力/MPa
1L408-22.524.929.270.29CO2驱15
2L89-12.524.0510.900.39CO2驱20
3Z82-22.504.1111.820.25CO2驱10
4Z288-22.515.078.150.20超前注气20
5Z288-52.505.087.320.16超前注气18
6Z452-42.505.068.430.20超前注气22
7Z273-12.515.068.830.21水驱5
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鄂尔多斯盆地长8段致密油超前注CO2驱原油动用特征
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王继伟 1, 2 , 刘建 1, 2 , 王选茹 1, 2 , 石璐铭 1, 2 , 郝栋 1, 2 , 宋鹏 1, 2 , 任吉田 3 , 肖文联 3
油气藏评价与开发 | 方法理论 2026,16(1): 107-117
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油气藏评价与开发 |方法理论 2026 , 16 (1) : 107 -117
鄂尔多斯盆地长8段致密油超前注CO2驱原油动用特征
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2 National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields, Xi’an, Shaanxi 710018, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1322964826053551000, tenantId=1146029695717560320, journalId=1322258508890079423, articleId=1322964814800233327, authorId=1322964825587983252, language=CN, stringName=王继伟, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=1, 2, address=1 中国石油长庆油田分公司勘探开发研究院,陕西   西安 710018
2 低渗透油气田勘探开发国家工程实验室,陕西   西安 710018, bio={"content":"

王继伟(1986—),男,硕士研究生,工程师,主要从事油气地质与开发方面的研究工作。地址:陕西省西安市未央区长庆兴隆园小区勘探开发研究院,邮政编码:710018。E-mail:

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王继伟(1986—),男,硕士研究生,工程师,主要从事油气地质与开发方面的研究工作。地址:陕西省西安市未央区长庆兴隆园小区勘探开发研究院,邮政编码:710018。E-mail:

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王继伟1, 2 , 刘建1, 2, 王选茹1, 2, 石璐铭1, 2, 郝栋1, 2, 宋鹏1, 2, 任吉田3, 肖文联3
作者信息
  • 1 中国石油长庆油田分公司勘探开发研究院,陕西   西安 710018
  • 2 低渗透油气田勘探开发国家工程实验室,陕西   西安 710018
  • 3 西南石油大学油气藏地质及开发工程全国重点实验室,四川   成都 610500
通讯作者:
肖文联(1983—),男,博士,教授,从事非常规油气渗流物理及其在油气田开发中应用的教学和科研工作。地址:四川省成都市新都区西南石油大学,邮政编码:610500。E-mail:
作者简介:

王继伟(1986—),男,硕士研究生,工程师,主要从事油气地质与开发方面的研究工作。地址:陕西省西安市未央区长庆兴隆园小区勘探开发研究院,邮政编码:710018。E-mail:

Characterization of crude oil mobilization under advanced CO2 injection in tight oil of Chang 8 member, Ordos Basin
JIWEI WANG1, 2 , JIAN LIU1, 2, XUANRU WANG1, 2, LUMING SHI1, 2, DONG HAO1, 2, PENG SONG1, 2, JITIAN REN3, WENLIAN XIAO3
Affiliations
  • 1 Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi’an, Shaanxi 710018, China
  • 2 National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields, Xi’an, Shaanxi 710018, China
  • 3 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
出版时间: 2026-01-26 doi: 10.13809/j.cnki.cn32-1825/te.2025053
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致密油  /  核磁共振  /  超前注CO2  /  提高采收率  /  动用下限
tight oil  /  nuclear magnetic resonance  /  advanced CO2 injection  /  enhanced oil recovery  /  mobilization lower limit
王继伟, 刘建, 王选茹, 石璐铭, 郝栋, 宋鹏, 任吉田, 肖文联. 鄂尔多斯盆地长8段致密油超前注CO2驱原油动用特征. 油气藏评价与开发, 2026 , 16 (1) : 107 -117 . DOI: 10.13809/j.cnki.cn32-1825/te.2025053
JIWEI WANG, JIAN LIU, XUANRU WANG, LUMING SHI, DONG HAO, PENG SONG, JITIAN REN, WENLIAN XIAO. Characterization of crude oil mobilization under advanced CO2 injection in tight oil of Chang 8 member, Ordos Basin[J]. Petroleum Reservoir Evaluation and Development, 2026 , 16 (1) : 107 -117 . DOI: 10.13809/j.cnki.cn32-1825/te.2025053
随着常规油气储层的枯竭和勘探开发的不断深入,作为非常规油气资源的重要组成,致密油已成为近年来石油勘探开发的热点以及未来石油接替的重要部分[1-4]。中国致密油资源分布广泛,全国的地质资源储量约为178.2×108 t,其中,鄂尔多斯盆地致密油储量为53×108 t[5-7]。不同于常规储层,致密油储层发育纳米孔隙,具有显著的非达西现象,并且储层具有非均质性强、孔隙度低、渗透率低和压力系数低的特征[8-11],导致密油一次采收率一般不超过10%[12-16]。因此,如何有效补能,提高致密油采收率对于保证油气资源的供应具有重要意义。
室内实验和矿场实践证明了CO2驱是提高致密油采收率的有效方式[17-19],在储层条件下,注入CO2为超临界状态,兼具了液体的密度和气体的低黏度和高扩散性[20-21],在微尺度上,CO2比水更容易进入纳米孔隙,能够有效地波及纳米孔隙内的原油[22-23],并且CO2与油接触,降低原油黏度、改善原油流动性和使得原油膨胀等[24]。ZHANG等[25-26]研究了有效应力变化对CO2驱采收率的影响,结果表明CO2对中大孔的波及效率随着驱替压力的增加而增加。金祥纯等[27]开展了线核磁共振CO2驱物理模拟实验,通过监测驱替过程中流体饱和度和采收率特征来定量研究不同孔隙的剩余油分布和微观动用特征。结果表明注入压力与CO2驱采收率呈正相关关系,高压CO2驱可增强油气传质,降低界面张力。此外,HAWTHORNE等[28]揭示了混相驱能够有效地提高原油采收率,强调了CO2的扩散作用的重要性,同时他们也指出相比于室内实验,CO2混相驱矿场实践会出现过早的气窜,从而降低CO2混相驱采收率。相反,CO2吞吐能够在一定程度改善CO2过早的气窜,杜代军等[29]利用核磁共振研究砾岩储层注CO2吞吐的开发效果,实验结果表明CO2吞吐采收率仅为37%,采收率随着吞吐轮次的增加而增加,第一个轮次贡献最大,采收率为27.57%。XIAO等[30]利用核磁共振技术研究了页岩油储层注CO2吞吐提高采收率的效果,实验结果表明增大吞吐压力能够有效提高采收率,且采收率主要来自前3个轮次[31]。因此,综合利用CO2吞吐的优势是一种潜在改善CO2驱替效果的方式。娄毅等[32]通过长岩心实验模拟了低渗透岩心超前注气驱,实验结果表明超前注气能够有效提升压力保持水平,采收率能达到77.03%。肖文联等[33]利用核磁共振技术研究了吞吐与驱替组合的开发过程中原油动用特征,CO2吞吐结合驱替作用有效动用了所有孔隙中原油,采收率在介于70%~80%,剩余油分布均匀,证实超前注CO2驱替能够综合驱替和吞吐的双重作用,改善CO2混相驱替效果。目前针对超前注气的研究在室内实验无明显的进展,尤其是对超前注气微观动用特征的研究较少。
以鄂尔多斯盆地马岭油田西331区长8段致密油储层岩心为研究对象,结合核磁共振技术开展了地层温度下的水驱、不同压力下的CO2驱和不同压力下的超前注CO2驱,分析获取了不同注入方式下的致密油储层岩心原油动用特征、赋存特征、采收率变化特征及孔隙动用下限,为超前注CO2驱合理开发方式及开发参数的优选奠定了基础。
7块岩心均取自鄂尔多斯盆地马岭油田西331区块长8段致密油储层,参照中华人民共和国国家标准《岩心分析方法》(GB/T 29172—2012)[34]对岩心进行洗油洗盐烘干后在孔压1.5 MPa,围压4 MPa的条件下测试岩心的孔隙度和渗透率。如表1所示,岩心孔隙度分布介于7.32%~11.82%,均值为9.24%;渗透率分布介于(0.16~0.39)×10-3 μm2,均值为0.24×10-3 μm2。图1为岩心铸体薄片和扫描电镜观察结果,致密油储层中发育有粒间孔、溶蚀孔和黏土控制微孔等多种孔隙类型。图2为岩心的高压压汞。结果表明毛细管压力曲线形态变化总体呈现低斜率快速进汞段和高斜率持续进汞段的两段式。
实验用油为研究区取芯井地层脱气原油,并按照中华人民共和国石油行业标准《最低混相压力实验测定方法-细管法》(SY/T 6573—2016)[35]测试得到原油的最小混相压力为17.4 MPa;实验用水为等地层水的重水溶液。结合流体的最小混相压力测试结果和杨勇等的研究成果,进行了不同压力下的CO2驱替实验,1倍数、1.1倍和1.2倍混相压力的超前注气实验和水驱实验(图3)。
超前注CO2驱、CO2驱和水驱实验流程包括(图4):核磁共振仪、夹持器、注入泵和采出气油分离计量装置。具体实验步骤如下:①将岩心和重水溶液分别装入带有吸水海绵垫的容器和压力容器中抽真空至133 Pa保持12 h,然后加压饱和脱气重水溶液一周以上,测量岩心饱和水质量,并计算岩心孔隙体积,直到岩心的饱和度达到98%以上。②将岩心装入夹持器中,用地层原油驱替饱和重水的岩心以建立束缚水饱和度,然后在地层温度(70 ℃)老化1周后进行核磁共振测试。采样参数分别设置为:回波间隔0.2 ms、等待时间5 000 ms、回波个数8 192、扫描次数64。③核磁共振在线水驱油。将老化后的岩心装入加持器中,同时加温至地层温度(70 ℃),利用回压将压差控制为1 MPa进行水驱油实验,驱替过程中记录出口端的产水产油量,并测试岩心的T2谱。④核磁共振CO2驱实验。将老化后的岩心装入夹持器,加温至地层温度(70 ℃),控制压差为1 MPa,进行CO2驱替实验并记录数据、测试T2谱。⑤超前注CO2驱实验。将老化后的岩心装入夹持器,加温至地层温度(70 ℃)并注入CO2使得压力达到设置压力,保持压力12 h后控制压差为1 MPa,进行超前注CO2驱驱替实验并记录数据、测试T₂谱。
核磁共振(NMR)作为一种快速测量流体及其分布的技术已经被广泛地应用于室内岩心分析,其横向弛豫时间由表面弛豫时间、流体弛豫时间和扩散弛豫时间3部分构成[36-38],表达式如下:
1T2=1T2B+1T2S+1T2D=1T2B+ρ2SV+DγGTE212
式中:T2为横向弛豫时间,单位ms;T2B为流体弛豫时间,单位ms;T2S为表面弛豫时间,单位ms;T2D为扩散弛豫时间,单位ms;ρ2为表面弛豫率,单位μm/ms;S为岩石孔隙内表面积,单位μm2;V为岩石孔隙体积,单位μm3;D为流体的扩散系数,单位μm2/ms;γ为氢原子核的磁旋比,单位MHz/T;G为磁场梯度,单位G/cm;TE为回波间隔,单位ms。
在均匀磁场中,流体弛豫时间介于2~3 s,并且回波间隔值也较小,因此,流体弛豫时间和扩散弛豫时间可忽略不计,其核磁共振横向弛豫时间主要由表面弛豫决定[39-40],具体表达式如下:
1T2=1T2S=ρ2SV
岩石孔隙内表面积与孔喉体积的比值一般可表示成孔喉体形状因子与孔喉半径的比值,由此可得到横向弛豫时间与孔喉半径间的表达式为[41-43]:
T2=1ρ2VS=1ρ2Frr
式中:Fr为孔喉体形状因子;r为孔喉半径,单位μm。
由公式(3)计算结果可知:核磁共振的横向弛豫时间与孔喉半径和孔喉形状因子是相关的,岩心孔喉半径越小,孔喉空间中流体的氢核与孔喉壁面碰撞的几率越大,对应的横向弛豫时间越短。
高压压汞曲线和核磁共振T2谱均能反应流体饱和度与孔隙大小之间的关系,在此基础上绘制了高压压汞孔隙半径和核磁共振横向弛豫时间之间的转换关系曲线(图5),得到岩心的孔隙半径分布介于0~139 μm,主要分布在10 μm左右。因此,为了分析驱替过程中的孔隙动用程度,研究将实验岩心的小孔(0~0.01 μm)、中孔(>0.01~0.25 μm)和大孔(>0.25 μm)的横向弛豫时间界限值分别定为0~1 ms、>1~10 ms、>10 ms。
根据实验过程中测试获取的核磁共振T2谱曲线,可以利用核磁共振曲线包络线面积的变化来计算获取该过程中原油的采收率,计算公式如式(4)所示:
ER=∫T2minT2maxm(T2)bdT2-∫T2minT2maxm(T2)adT2∫T2minT2maxm(T2)bdT2×100%
式中:ER为某一过程的原油采收率,%;m(T2)b为实验前核磁共振T2谱信号幅度;m(T2)a为实验后核磁共振T2谱信号幅度;T2min为核磁共振T2谱中的最小弛豫时间,单位ms;T2max为核磁共振T2谱中的最大弛豫时间,单位ms。
在束缚水状态下,Z273-1岩心水驱过程的核磁共振T2谱曲线呈现出“左低右高”的双峰特征,且峰值主要集中在孔隙半径为10 μm左右的孔隙当中,表明原油赋存于大孔隙中。随着水注入PV的增加,T2谱曲线信号幅度逐渐降低,主要动用的是孔隙半径为10 μm左右中孔隙的原油,而半径小于0.25 μm的孔隙内的原油难以被动用(图6)。
在束缚水状态下,针对6块岩心在不同压力下的CO2驱和超前注CO2驱的核磁共振T2谱进行了分析研究,结果发现(图7):T2谱曲线为左低右高的双峰,原油主要赋存在孔隙半径为10 μm的孔隙中。随着CO2注入量的增加,T2谱均表现出下降的趋势,且初期主要表现出孔隙半径大于0.25 μm以上的孔隙,随后是孔隙半径小于0.25 μm的孔隙。对于非混相驱替(Z82-2岩心),孔隙半径大于10 μm的孔隙的信号幅度几乎都下降为0,而孔隙半径小于0.25 μm的核磁共振信号幅度下降不明显,说明非混相驱替仅能够驱替大孔隙中的原油,小孔隙难以被有效波及。随着注入压力的增加,大孔隙的原油动用程度增加,且微纳米孔隙中的原油也有所动用,说明孔隙半径大于0.25 μm的原油基本驱替干净,仅较小孔隙中赋存有部分原油。
通过分析CO2驱过程不同孔隙采收率变化特征发现(图8):水驱采收率为40%左右,且主要来自大孔隙,而CO2驱采收率更高,且随着注入压力的增加而提高,混相驱达76%。对于非混相驱,大孔隙采收率在初期迅速增加,达到了60%左右,小孔和中孔的采收率较低,分别为1.43%、1.38%。在非混相驱过程中,注入的CO2是非润湿相,原油为润湿性,毛细管压力表现为阻力。高速流动的CO2通过黏性剪切作用将大孔中原油快速驱替,形成黏性指进通道,难以进入纳米级孔隙。岩心束缚水状态下原油主要集中于大孔,因此在混相驱替过程中大孔采收率较高。相比于非混相驱,近混相驱和混相驱采收率上升速度随着注入PV的提升迅速增加,更高压力的CO2能够克服毛细管效应进入更小的孔隙,从而提高CO2的波及效率。同时,CO2与原油之间多次接触使得CO2与原油之间的界面张力降低趋近于0,降低原油黏度,改善了原油的流动性显著降低毛细管压力。在混相驱替时,CO₂与原油之间的毛细管压力消失,进一步改善了中小孔隙的波及效果,采收率达到了8%。
图9为混相驱和超前注CO2驱期间产出油相的照片,可发现混相驱过程中以连续油相出现,而超前注CO2驱过程中原油出现溶解CO2脱出的特征,表现小段塞的CO2与原油流动,且随着时间的增加,段塞比表现出逐渐增大。图10为不同压力的超前注CO2驱的采收率,Z288-5岩心的大孔、中孔和小孔的采收率分别为69.0%、11.1%、0.6%。当压力增加到1.2倍混相压力时,各级孔隙的采收率进一步提升,中孔采收率约为混相驱的1.8倍,最终采收率达到87%。因此,油气之间的质量传递一定程度上决定了CO2驱纳米级孔隙的采收率,而质量传递的过程受到CO2的扩散特征和孔隙结构的影响[24,44]。结合实验过程中的原油流动特征,研究认为超前注CO2驱闷井阶段仅存在CO2的扩散作用,在压力梯度下可萃取原油的轻质组分,形成动态萃取-膨胀循环,这种多级传质过程使原油黏度降低,同时引发体积膨胀显著改善原油流动性,这种分阶段传质过程比单一混相驱更高效,尤其对中小孔隙中的吸附态原油作用显著[45-46]。因此,超前注气在一方面增加原油的弹性能,另一方面能够改善原油的性质,降低流度比,更容易驱替中小孔隙中的原油。
图11中黄色和红色的区域对应了岩心较高的含油饱和度,而图中绿色和蓝色部分对应了较低油饱和度的区域。驱替前,原油在岩心内均匀分布,水驱后,Z273-1岩心入口端的剩余油饱和度下降较为明显,出口端仍然有大量的剩余油分布。与水驱类似,Z82-2岩心在非混相驱后,岩心入口端表现出小连片和孤立的剩余油,越靠近出口端,剩余油的分布越集中,这说明在CO2非混相驱替过程中存在指进现象,使得原油分布在岩心两端的分布存在明显的差异。随着驱替压力的增加,岩心中连片剩余油分布减少,表现出更多的孤立油滴。L89-1岩心在混相驱替以后,核磁共振成像结果仅存在一个亮斑,靠近入口和出口端的原油分布特征异性较小,说明混相驱表现出近似的活塞驱替。相比于混相驱,超前注CO2驱替进一步促进CO2与原油之间的相互作用。在超前注CO2驱替以后,岩心中存在大量的孤立油滴,连片剩余油较少。随着注入压力的提高,连片剩余油也被动用,部分孔隙中的原油被驱替干净,仅存在部分的孤立油滴。
为进一步明确不同开发过程中的开发效果,本节结合分形理论以及毛细管束模型构建了可动下限计算模型来计算岩心样品中可动原油的孔隙半径下限[47]。将实验岩心的孔隙等效为一系列长度、半径、束缚水薄膜厚度的毛细管表示,并假设束缚水薄膜在毛细管束中均匀分布。
根据饱和水状态下核磁共振T2谱面积A1与束缚水状态核磁共振T2谱曲线面积A2之间代表束缚水在孔隙中的分布,残余油状态下的核磁共振T2谱曲线面积A3即为残余油的分布,利用T2谱面积比值法,计算束缚水饱和度和残余油饱和度的公式如下:
Swi=A1-A2A1×100%
Sor=A3A1×100%
式中:Swi为束缚水饱和度,%;Sor为残余油饱和度,%;A1为饱和水核磁共振T2谱面积;A2为束缚水核磁共振T2谱面积;A3为残余油核磁共振T2谱面积。
基于多孔介质分形理论,建立简化的毛细管模型,假定致密储层储存空间由一系列长度为L半径为r的毛细管组成,且束缚水膜厚度均匀分布在毛细管中,则毛细管模型中的孔喉半径大于r的孔喉数量可以表示为:
N=∫rrmaxP(r)dr∝r-D
式中:N为孔喉数量,单位个;rmax为临界孔喉半径的最大值,单位μm;P(r)为孔喉半径的分布密度函数;D为分形维数。
假设孔隙大小分布连续,对等式(7)求微分得到孔隙半径在r和r+dr之间的孔喉数量为:
dN(>r)=-Dr-D-1rmaxDdr
在驱替过程中,样品孔隙空间内未被驱动的残余油体积可以表示为:
Vs=-∫rminrcπ(r-h)2LdN
式中:Vs为样品孔隙空间内未被驱动的残余油体积,单位cm3;rc为可动流体半径,单位μm;rmin为临界孔喉半径的最小值,单位μm;h为束缚水膜厚度,单位μm;L为毛细管长度,单位cm。
孔喉内的束缚水薄膜厚度与束缚水饱和度可用下式表示:
Swi=2hr
式中:Swi为孔喉内的束缚水薄膜厚度与束缚水饱和度关系。
毛细管长度和毛细管半径之间存在线性相关关系:
L=ar
式中:a为线性相关系数。
将公式(8)和公式(10)、(11)带入公式(9),则孔隙空间中剩余油体积可表示为:
Vs=-aπDrmaxD3-D(rd3-D-rmin3-D)(1-Swi2)2
式中:rd为临界孔喉半径,单位μm。
临界孔喉半径为最小孔喉半径,且束缚水膜厚度为0时,此时的累积计算体积公式为:
Vp=-∫rminrmaxπr2LdN
式中:Vp为样品空间总孔隙体积,单位cm3。
将公式(8)、公式(10)、公式(11)带入公式(13),则公式(13)可以转换为:
Vp=-aπDrmaxD3-D(rmax3-D-rmin3-D)
残余油饱和度可以表示为:
Sor=(1-Swi2)2(rmax3-D-rc3-Drmax3-D-rmin3-D)
由于最大孔喉半径远大于最小孔喉半径,所以公式(15)中最小孔喉半径可忽略不计,则公式(15)可以表示为:
Sor=1-Swi221-rcrmax3-D
由公式(16)可以得出可动流体动用下限的计算式为:
rc=rmax[1-4Sor2-Swi2]13-D
图12展示了不同注入方式下的原油可动半径下限,从图中能够看出:水驱孔喉的动用下限为194 nm;相比于水驱,CO2驱的动用下限更低,并且随着注入压力的提升,混相驱替的动用下限可到50 nm,相比于混相驱,超前注气的动用下限进一步降低。根据杨勇等[48]的研究成果,相比于相同压力的混相驱,压力为1.0倍最小混相压力时,当超前注CO2驱替能够更加有效的驱替中小孔隙中的原油,其动用下限为30 nm;当超前注CO2驱替压力提升至压力提高至1.2倍最小混相压力时,岩心内部的压力保持水平提升,更多的CO2能够有效的进入中小孔隙中,孔隙动用下限突破至20 nm,远大于了混相驱替的50 nm。
利用核磁共振技术研究了水驱、不同压力的CO2驱和超前注CO2的采收率变化特征、孔隙动用特征,并结合毛细管束模型获得了不同注入方式下的孔隙动用下限,具体的结论如下:
1) 核磁共振结果表明:水驱采收率在40%左右,主要来自大孔隙;CO2驱采收率高于水驱,且随着混相程度的增加而增加,混相驱采收率为76%,主要来自大孔隙和中孔;相同条件下超前注CO2驱替效果更好,当达到1.2倍最小混相压力时,采收率为87%,中小孔隙的采收率远大于了混相驱和水驱。
2) 核磁共振成像结果表明:水驱油剩余油仍然表现为连片剩余油的分布,仅入口端部分原油得到动用;相比水驱,CO2驱后连片剩余油减少,更多的表现出孤立油滴的分布,且连片剩余油随着混相程度地增加而减少;超前注CO2驱后,原油分布较为均匀,剩余油主要表现为孤立油滴,部分区域原油被驱替干净。
3) 水驱孔喉动用下限为194 nm,CO2驱动用下限更低,且随着混相程度的增加而降低,混相驱替其动用下限为50 nm;超前注CO2驱替压力提升至1.2倍最小混相压力时,孔隙动用下限突破至20 nm。

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2026年第16卷第1期
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doi: 10.13809/j.cnki.cn32-1825/te.2025053
  • 接收时间:2025-01-24
  • 首发时间:2026-10-30
  • 出版时间:2026-01-26
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  • 收稿日期:2025-01-24
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    1 中国石油长庆油田分公司勘探开发研究院,陕西   西安 710018
    2 低渗透油气田勘探开发国家工程实验室,陕西   西安 710018
    3 西南石油大学油气藏地质及开发工程全国重点实验室,四川   成都 610500

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肖文联(1983—),男,博士,教授,从事非常规油气渗流物理及其在油气田开发中应用的教学和科研工作。地址:四川省成都市新都区西南石油大学,邮政编码:610500。E-mail:
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2种不同金属材料的力学参数
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Percentage of
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属
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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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