Article(id=1311999291145675514, tenantId=1146029695717560320, journalId=1311385891987619962, issueId=1311998530802250506, articleNumber=null, orderNo=null, doi=10.12090/j.issn.1006-6616.2025050, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1747065600000, receivedDateStr=2025-05-13, revisedDate=1767456000000, revisedDateStr=2026-01-04, acceptedDate=1767542400000, acceptedDateStr=2026-01-05, onlineDate=1790734606777, onlineDateStr=2026-09-30, pubDate=1787846400000, pubDateStr=2026-08-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1790734606777, onlineIssueDateStr=2026-09-30, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1790734606777, creator=13701087609, updateTime=1790734606777, updator=13701087609, issue=Issue{id=1311998530802250506, tenantId=1146029695717560320, journalId=1311385891987619962, year='2026', volume='32', issue='4', pageStart='771', pageEnd='998', issueExtLink='null', onlineDate='null', pubDate='1787846400000', pubDateStr='2026-08-28', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1790734425497, creator='13701087609', updateTime=1790739498146, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1312019807097160415, tenantId=1146029695717560320, journalId=1311385891987619962, issueId=1311998530802250506, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1312019807097160416, tenantId=1146029695717560320, journalId=1311385891987619962, issueId=1311998530802250506, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=842, endPage=860, ext={EN=ArticleExt(id=1311999291653186299, articleId=1311999291145675514, tenantId=1146029695717560320, journalId=1311385891987619962, language=EN, title=Evaluation of hydrocarbon source rocks and oil-source correlation of the Chang 7 and Chang 6 Members of the Yanchang Formation in the Jingbian area, Ordos Basin, columnId=1311998584313184930, journalTitle=Journal of Geomechanics, columnName=Energy Resources Geology, runingTitle=null, highlight=null, articleAbstract=
Objective

The Chang 7 and Chang 6 Members of the Yanchang Formation in the Jingbian area of the Ordos Basin are important source rock intervals. However, systematic studies on their hydrocarbon generation potential and contributions to hydrocarbon accumulation remain limited, which has hindered further exploration efforts in this region. Therefore, this study applies geochemical analytical methods to systematically characterize the distribution and the geochemical properties of the Chang 7 and Chang 6 source rocks in the Jingbian area. In addition, the geochemical signatures of the crude oils from the Yan 9 and Chang 2 reservoirs in the Jingbian Oilfield were investigated.

Methods

By comparing the geochemical parameters of the Chang 7 and Chang 6 source rocks in the study area with those of the Zhangjiatan Shale in the basin center, the potential sources of the Yan 9 and Chang 2 reservoir oils were identified through oil–source correlation.

Results

The Chang 7 source rocks are moderate to excellent-quality source rocks, characterized by wide distribution, large thickness, Type Ⅰ–Ⅱ2 kerogen, and a mature thermal evolution stage. Biomarker characteristics indicate mixed organic matter inputs and deposition under reducing conditions with relatively low salinity. Low Pr/Ph ratios and high C27/C29 regular sterane ratios suggest that the organic matter was predominantly derived from aquatic algae and other lower organisms and accumulated in a reducing freshwater to brackish-water depositional environment. In contrast, the Chang 6 source rocks are moderate to good-quality source rocks, dominated by Type Ⅱ2–Ⅲ kerogen, and generally at the low-maturity to mature stage. Moderate Pr/Ph ratios and relatively low C27/C29 regular sterane ratios indicate a predomint innput of terrigenous higher plantsand deposition under weakly reducing conditions. Oil-source correlation results reveals that the Yan 9 and Chang 2 crude oils have the same originand were primarily sourced from the Chang 7 source rocks, with a minor contribution from the Chang 6 source rocks. The distinct geochemical characteristics of the Zhangjiatan Shale compared with the Yan 9 and Chang 2 crude oils further suggest that the Zhangjiatan Shale was not the major hydrocarbon source for these oils.

Conclusions

(1) The Chang 7 Member is the primary and high-quality source rock in the Jingbian area, exhibiting advantages over the Chang 6 Member in terms of thickness, lateral distribution, organic matter abundance, and hydrocarbon generation potential. (2) Distinct biomarker signatures differentiate the Chang 7 (aquatic/algal-derived organic matter under reducing conditions), Chang 6 (terrigenous organic matter under weakly reducing conditions), and Zhangjiatan Shale (highly aquatic organic matter under strongly reducing conditions) source rocks. (3) The Yan 9 and Chang 2 crude oils share a common origin and were primarily sourced from local Chang 7 source rocks, with possible minor contributions from the Chang 6 source rocks. These oils show no direct genetic relationship with the Zhangjiatan Shale in the basin center, supporting a predominantly local hydrocarbon charging model in the Jingbian area. [Significance] This study provides critical geochemical evidence for understanding the local hydrocarbon system, resolving uncertainties regarding oil sources, and evaluating exploration potential in the Jingbian area of the Ordos Basin.

, authors=Siwei TANG1, Hui XUE2, 3, Youjun TANG1, Shumin WANG2, 3, Guangming HU4, Geng LI5, Fangtingyu SHI4, authorsList=Siwei TANG, Hui XUE, Youjun TANG, Shumin WANG, Guangming HU, Geng LI, Fangtingyu SHI, authorCompany=null, correspAuthors=Youjun TANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright ©2026 Journal of Geomechanics. All rights reserved., 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=1311999309910991673, articleId=1311999291145675514, tenantId=1146029695717560320, journalId=1311385891987619962, language=CN, title=鄂尔多斯盆地靖边地区延长组长7—长6段烃源岩评价及油源对比, columnId=1311998584489345700, journalTitle=地质力学学报, columnName=能源地质, runingTitle=null, highlight=null, articleAbstract=

鄂尔多斯盆地靖边地区延长组7段(长7段)与延长组6段(长6段)是该区重要的烃源岩层系。然而,目前关于这2套烃源岩的生烃潜力及其对油气成藏贡献的系统研究仍较为薄弱,制约了该区勘探工作的进一步深化。此次研究运用地球化学分析手段,系统刻画了靖边地区长7段与长6段烃源岩的展布特征与地球化学性质,并分析了靖边油田延安组9段(延9段)和延长组2段(长2段)原油的地球化学特征。通过对比该区域长7段、长6段烃源岩与湖盆中心张家滩页岩的地球化学指标,明确了延9段和长2段油藏原油的潜在来源。研究结果表明:长7段烃源岩属中等–优质烃源岩,分布广、厚度大,有机质类型以Ⅰ–Ⅱ2型为主,处于成熟阶段。生物标志物特征显示其母质为混合生源输入,沉积环境偏还原、水体盐度较低。较低的Pr/Ph比值与较高的C27/C29规则甾烷比值(C27/C29R)指示长7段烃源岩有机质以水生藻类等低等生物为主,形成于还原性的淡水–微咸水环境。长6段烃源岩为中等–好烃源岩,有机质类型以Ⅱ2–Ⅲ型为主,整体处于低熟–成熟阶段;中等的Pr/Ph比值与较低的C27/C29R则反映其有机质以陆源高等植物输入为主,沉积环境为弱还原环境。油–源对比结果表明,延9段与长2段原油为同源油,主要来源于靖边地区长7段烃源岩,但长6段烃源岩亦存在一定贡献。湖盆中心张家滩页岩的地球化学特征与延9段、长2段原油差异显著,进一步支持原油主要为本地烃源岩所供烃。此次研究为鄂尔多斯盆地靖边地区油气勘探方向优选与资源潜力评价提供了关键地球化学依据。

, authors=汤思维1, 薛辉2, 3, 唐友军1, 王淑敏2, 3, 胡光明4, 李赓5, 石方廷玉4, authorsList=汤思维, 薛辉, 唐友军, 王淑敏, 胡光明, 李赓, 石方廷玉, authorCompany=null, correspAuthors=唐友军, authorNote=

作者贡献声明

唐友军、汤思维、胡光明、薛辉负责论文构思、数据分析、研究方法和论文写作;汤思维、王淑敏参与数据分析和技术手段的实践应用和绘图;汤思维、李赓、石方廷玉参与数据分析、研究方法和修改。所有作者均阅读并同意稿件的提交和发表。

Author’s Contributions

TANG Youjun, TANG Siwei, HU Guangming, and XUE Hui conceived the study, performed data analysis, designed the research methodology, and drafted the manuscript; TANG Siwei and WANG Shumin participated in data analysis, practical application of technical approaches, and figure generation; TANG Siwei, LI Geng and SHI Fangtingyu were involved in data analysis, refinement of the research methodology, and manuscript revision. All authors have read and approved the submission and publication of the manuscript.

汤思维(2000—),女,在读硕士,研究方向为油气地球化学。Email:

, correspAuthorsNote=
唐友军(1975—),男,教授,博士生导师,从事非常规和常规油气地质综合评价、无机–有机地球化学结合与古环境、古气候重建研究。Email:
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articleId=1311999291145675514, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=93, rfOrder=92, authorNames=null, journalName=null, refType=null, unstructuredReference=吴悠, 陈一博, 胥中义, 等, 2025. 鄂尔多斯盆地志靖—安塞地区延长组10段油气成藏过程分析[J]. 东北石油大学学报, 49(1): 33-44, 60., articleTitle=null, refAbstract=null), Reference(id=1311999376273268760, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=94, rfOrder=93, authorNames=null, journalName=null, refType=null, unstructuredReference=阎珍, 任大忠, 王虎, 等, 2024. 鄂尔多斯盆地神木地区侏罗系延安组煤层孔隙结构及可动流体饱和度影响因素[J]. 非常规油气, 11(5): 122-131., articleTitle=null, refAbstract=null), Reference(id=1311999376336183321, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=95, rfOrder=94, authorNames=null, journalName=null, refType=null, unstructuredReference=杨孝勇, 唐友军, 洪海涛, 等, 2022. 川中地区大安寨段分子标志物异常组合及其地球化学意义[J]. 地质通报, 41(4): 669-681., articleTitle=null, refAbstract=null), Reference(id=1311999376621395994, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=96, rfOrder=95, authorNames=null, journalName=null, refType=null, unstructuredReference=尹锦涛, 俞雨溪, 姜呈馥, 等, 2017. 鄂尔多斯盆地张家滩页岩元素地球化学特征及与有机质富集的关系[J]. 煤炭学报, 42(6): 1544-1556., articleTitle=null, refAbstract=null), Reference(id=1311999376705282075, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=97, rfOrder=96, authorNames=null, journalName=null, refType=null, unstructuredReference=袁珍, 司豪杰, 马瑶, 等, 2024. 鄂尔多斯盆地侏罗系延安组源-汇系统特征及古地理格局[J]. 西北大学学报(自然科学版), 54(6): 1104-1120., articleTitle=null, refAbstract=null), Reference(id=1311999376810139676, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=98, rfOrder=97, authorNames=null, journalName=null, refType=null, unstructuredReference=张海, 雷华伟, 张涛, 等, 2018. 鄂尔多斯盆地靖边油田西部延9原油地球化学特征与油源[J]. 石油实验地质, 40(6): 836-842., articleTitle=null, refAbstract=null), Reference(id=1311999377015660573, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=99, rfOrder=98, authorNames=null, journalName=null, refType=null, unstructuredReference=张文正, 杨华, 昝川莉, 等, 2016. 鄂尔多斯盆地伊陕斜坡中南部高热演化地区古生界天然气地球化学研究[J]. 地球化学, 45(6): 614-622., articleTitle=null, refAbstract=null), Reference(id=1311999377133101086, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=100, rfOrder=99, authorNames=null, journalName=null, refType=null, unstructuredReference=张新乐, 平宏伟, 杨鑫, 等, 2024. 鄂尔多斯盆地南缘泾河油田长7段烃源岩生、排烃期与油气成藏期对比[J]. 地质科技通报, 43(1): 108-121., articleTitle=null, refAbstract=null), Reference(id=1311999377443479583, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=101, rfOrder=100, authorNames=null, journalName=null, refType=null, unstructuredReference=张瑶瑶, 杨水胜, 刘宇琪, 等, 2023. 鄂尔多斯盆地靖边油田沙洼沟地区延安组延9油藏富集规律[J]. 西北地质, 56(2): 213-224., articleTitle=null, refAbstract=null), Reference(id=1311999377556725792, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=102, rfOrder=101, authorNames=null, journalName=null, refType=null, unstructuredReference=赵靖舟, 高振东, 孟选刚, 等, 2025. 鄂尔多斯盆地陕北地区三叠系延长组长7—长9油层组重力流沉积致密油富集条件与勘探潜力: 兼论拗陷型湖盆的石油勘探范式[J]. 石油与天然气地质, 46(5): 1367-1391., articleTitle=null, refAbstract=null), Reference(id=1311999379175727137, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=103, rfOrder=102, authorNames=null, journalName=null, refType=null, unstructuredReference=中华人民共和国国家质量监督检验检疫总局, 中国国家标准化管理委员会, 2013. 岩石热解分析: GB/T 18602-2012[S]. 北京: 中国标准出版社., articleTitle=null, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1311999310812767035, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, xref=1, ext=[AuthorCompanyExt(id=1311999310821155644, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, companyId=1311999310812767035, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1Hubei Key Laboratory of Petroleum Geochemistry and Environment (Yangtze University), Wuhan 430100, Hubei, China), AuthorCompanyExt(id=1311999310829544253, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, companyId=1311999310812767035, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, 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companyName=null, departmentName=null, remark=5The First Oil Production Factory, Changqing Oilfield Company, PetroChina, Yan’an 716000, Shaanxi, China), AuthorCompanyExt(id=1311999314205958985, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, companyId=1311999314176598855, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=5中国石油长庆油田分公司第一采油厂,陕西 延安 716000)])], figs=[ArticleFig(id=1311999328013607805, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.1, caption=Geographical location and sample distribution of the study area, figureFileSmall=RXCQbP5KxcGhmV2mmCHUYg==, figureFileBig=42p4V/BSLG9NGfymWQ1GUA==, tableContent=null), ArticleFig(id=1311999328361735038, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图1, caption=研究区地理位置图和样品分布图

a—研究区地理位置图;b—研究区样品分布图

, figureFileSmall=RXCQbP5KxcGhmV2mmCHUYg==, figureFileBig=42p4V/BSLG9NGfymWQ1GUA==, tableContent=null), ArticleFig(id=1311999330093982592, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.2, caption=Lithological characteristics of hydrocarbon source rocks in the study area, figureFileSmall=D+l7tG1/cEK8WHTbJsSDOQ==, figureFileBig=1Lkk+QnbucERNdseF0x+wg==, tableContent=null), ArticleFig(id=1311999330190451586, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图2, caption=研究区烃源岩岩性特征

a—黑色泥岩;b—含砂泥岩;c—灰黑色泥岩;d—黑色煤屑;e—灰黑色泥岩;f—深灰色泥岩

, figureFileSmall=D+l7tG1/cEK8WHTbJsSDOQ==, figureFileBig=1Lkk+QnbucERNdseF0x+wg==, tableContent=null), ArticleFig(id=1311999330450498436, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.3, caption=Composite stratigraphic columns of Chang 7 and Chang 6 Members in the study area, figureFileSmall=muvose2hCpZT1g2k4cC1vg==, figureFileBig=w3IUtMlFLRYvuElkv3CDlA==, tableContent=null), ArticleFig(id=1311999330555356037, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图3, caption=研究区长7—长6段综合柱状图

GR—自然伽马;AC—声波时差;SP—自然电位;RT—电阻率

, figureFileSmall=muvose2hCpZT1g2k4cC1vg==, figureFileBig=w3IUtMlFLRYvuElkv3CDlA==, tableContent=null), ArticleFig(id=1311999330865734534, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.4, caption=Cross plot of TOC content vs. hydrocarbon generation potential (S1+S2) of hydrocarbon source rocks in the study area, figureFileSmall=Xttou9bRmRM77/pjkxo5EQ==, figureFileBig=rXXPxui+Th8zedCdVasF7A==, tableContent=null), ArticleFig(id=1311999330937037705, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图4, caption=研究区烃源岩TOC含量和生烃潜量(S1+S2)交会图, figureFileSmall=Xttou9bRmRM77/pjkxo5EQ==, figureFileBig=rXXPxui+Th8zedCdVasF7A==, tableContent=null), ArticleFig(id=1311999331029312393, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.5, caption=Cross-plot of Tmax vs. HI for hydrocarbon source rocks in the study area, figureFileSmall=pAa5CkgZci+8Y3YLIpWV1Q==, figureFileBig=UzGN5HzxrYYcVuP3K8TtyA==, tableContent=null), ArticleFig(id=1311999331725566858, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图5, caption=研究区烃源岩Tmax与HI交会图

Tmax 为最大热解峰温

, figureFileSmall=pAa5CkgZci+8Y3YLIpWV1Q==, figureFileBig=UzGN5HzxrYYcVuP3K8TtyA==, tableContent=null), ArticleFig(id=1311999331801064331, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.6, caption=Evaluation of organic matter maturity of hydrocarbon source rocks in the study area, figureFileSmall=uiPZ9NMU6DqKFpHgAs//aA==, figureFileBig=RltKpuP737c4LQJy9tjwPQ==, tableContent=null), ArticleFig(id=1311999332144997260, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图6, caption=研究区烃源岩有机质成熟度评价

a—深度和Ro交会图;b—深度和Tmax交会图

, figureFileSmall=uiPZ9NMU6DqKFpHgAs//aA==, figureFileBig=RltKpuP737c4LQJy9tjwPQ==, tableContent=null), ArticleFig(id=1311999332212106125, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.7, caption=Composite geochemical correlation sections of hydrocarbon source rocks in the study area, figureFileSmall=5kFQ2fGQ4A+Rthb0Lo0YHw==, figureFileBig=UnaCzZfDNIYijOtMVFm0fQ==, tableContent=null), ArticleFig(id=1311999332568621966, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图7, caption=研究区综合地球化学连井剖面图

连井剖面纵向按实际深度绘制,横向井位为便于展示采用等间距排列,不代表实际井间距离;实际井位及剖面位置见平面图

, figureFileSmall=5kFQ2fGQ4A+Rthb0Lo0YHw==, figureFileBig=UnaCzZfDNIYijOtMVFm0fQ==, tableContent=null), ArticleFig(id=1311999332962886543, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.8, caption=Isopach maps of hydrocarbon source rocks in the study area, figureFileSmall=jsYEV2tCHw4LQ3zZrA8gMA==, figureFileBig=dam1YXOkE8FUzz0mCBhKtA==, tableContent=null), ArticleFig(id=1311999334653191056, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图8, caption=研究区烃源岩厚度等值线图

a—长6段烃源岩厚度图;b—长7段烃源岩厚度图

, figureFileSmall=jsYEV2tCHw4LQ3zZrA8gMA==, figureFileBig=dam1YXOkE8FUzz0mCBhKtA==, tableContent=null), ArticleFig(id=1311999334724494225, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.9, caption=Distributions of n-alkanes and isoprenoids in soluble organic matter from typical hydrocarbon source rocks of the Chang 6 and Chang 7 Members in the study area, figureFileSmall=l5YFv4vIzXPn83ke1xBTnw==, figureFileBig=hEY4xRg04VtJIlILsEnRQw==, tableContent=null), ArticleFig(id=1311999334795797394, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图9, caption=研究区长6段与长7段典型烃源岩可溶有机质中正构烷烃与类异戊二烯烃分布

Pr—姥鲛烷; Ph—植烷;TIC—总离子流色谱图

, figureFileSmall=l5YFv4vIzXPn83ke1xBTnw==, figureFileBig=hEY4xRg04VtJIlILsEnRQw==, tableContent=null), ArticleFig(id=1311999335148118931, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.10, caption=Cross plot of Ph/nC18 vs. Pr/nC17 for hydrocarbon source rocks in the study area and the Zhangjiatan Shale, figureFileSmall=BJoTbO/6I5g1fmLblePl5Q==, figureFileBig=O2VaWlQUJ87/+ZChrFATQg==, tableContent=null), ArticleFig(id=1311999335223616404, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图10, caption=研究区烃源岩及张家滩页岩Ph/nC18和Pr/nC17关系图, figureFileSmall=BJoTbO/6I5g1fmLblePl5Q==, figureFileBig=O2VaWlQUJ87/+ZChrFATQg==, tableContent=null), ArticleFig(id=1311999335492051861, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.11, caption=Distributions of terpanes and steranes in soluble organic matter from typical hydrocarbon source rocks of the Chang 6 and Chang 7 Members in the study area, figureFileSmall=NM5J/1wlJdeAFZlWp9cv7Q==, figureFileBig=LRrexWXC1OFNb4fI0jr0oA==, tableContent=null), ArticleFig(id=1311999335592715158, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图11, caption=研究区长6段与长7段典型烃源岩可溶有机质萜烷与甾烷分布

m/z = 191—萜烷类化合物特征离子;m/z = 217—甾烷类化合物特征离子;C27/C29R—C27与C29规则甾烷相对含量比值;Ga/C30H—伽马蜡烷指数

, figureFileSmall=NM5J/1wlJdeAFZlWp9cv7Q==, figureFileBig=LRrexWXC1OFNb4fI0jr0oA==, tableContent=null), ArticleFig(id=1311999335668212631, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.12, caption=Characteristic biomarker parameter combinations of hydrocarbon source rocks in the study area and the Zhangjiatan Shale, figureFileSmall=w63hE4Uuql5SnedvVSHd2w==, figureFileBig=T4mNV3z6uGaXbUC9dPpsdw==, tableContent=null), ArticleFig(id=1311999335911482264, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图12, caption=研究区烃源岩与张家滩页岩生物标志化合物参数组合

纵坐标数值表示各生物标志化合物参数的比值

, figureFileSmall=w63hE4Uuql5SnedvVSHd2w==, figureFileBig=T4mNV3z6uGaXbUC9dPpsdw==, tableContent=null), ArticleFig(id=1311999335986979737, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.13, caption=Distributions of n-alkanes, isoprenoids, terpanes, and steranes from crude oils in the study area, figureFileSmall=QFc68yNJareYAmymtJRBYQ==, figureFileBig=Vk02FyDU6NRj/D5Q+5zMhw==, tableContent=null), ArticleFig(id=1311999336054088603, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图13, caption=研究区原油中正构烷烃与类异戊二烯烃、萜烷与甾烷分布

Pr—姥鲛烷; Ph—植烷;TIC—总离子流色谱图;m/z = 191—萜烷类化合物特征离子;m/z = 217—甾烷类化合物特征离子;C27/C29R—C27与C29规则甾烷相对含量比值;Ga/C30H—伽马蜡烷指数

, figureFileSmall=QFc68yNJareYAmymtJRBYQ==, figureFileBig=Vk02FyDU6NRj/D5Q+5zMhw==, tableContent=null), ArticleFig(id=1311999336137974684, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.14, caption=Cross plot of C29-αββ/(ααα+αββ) vs. C29-20S/(20S+20R) from crude oil in the study area, figureFileSmall=wa9IGiS2CY+1NhsKoHG8cA==, figureFileBig=5SGjDXFyLDcSmy0+3F06Qg==, tableContent=null), ArticleFig(id=1311999336377050013, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图14, caption=研究区原油C29-αββ/(ααα+αββ)和C29-20S/(20S+20R)关系图, figureFileSmall=wa9IGiS2CY+1NhsKoHG8cA==, figureFileBig=5SGjDXFyLDcSmy0+3F06Qg==, tableContent=null), ArticleFig(id=1311999336456741790, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Fig.15, caption=Comparison of biomarkers between crude oils and hydrocarbon source rocks in the study area, figureFileSmall=+2UTdmtPIHmsZPvDY4y+Zg==, figureFileBig=xcDijPYzpiGrmx9b1t7umA==, tableContent=null), ArticleFig(id=1311999336746148767, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=图15, caption=原油与烃源岩生物标志化合物对比图

a—C30D/C30H 和 C30M/C30H交会图;b—Pr/Ph vs. Pr/nC17交会图;c—Pr/Ph vs. C27/C29R交会图;d—C27, C28 和C29三角图

, figureFileSmall=+2UTdmtPIHmsZPvDY4y+Zg==, figureFileBig=xcDijPYzpiGrmx9b1t7umA==, tableContent=null), ArticleFig(id=1311999336851006368, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Tab.1, caption=

Geochemical data of hydrocarbon source rocks in the study area

, figureFileSmall=null, figureFileBig=null, tableContent=
层位TOC含量/%S1+S2/(mg/g)Tmax/℃HI/(mg/g)Ro/%丰度评价
注:$ \dfrac{0.42~7.05}{2.26\left(21\right)} $表示$ \dfrac{最小值~最大值}{平均值(样品数)} $
长6段 $\dfrac{0.42~7.05}{2.26(21)} $ $\dfrac{0.87~18.88}{5.74(21)} $ $\dfrac{438~454}{446(21)} $ $\dfrac{41~1009}{179(21)} $ $\dfrac{0.84~0.89}{0.86(13)} $中等—好
长7段 $\dfrac{0.68~8.46}{2.84(62)} $ $\dfrac{1.02~47.93}{13.15(62)} $ $\dfrac{438~461}{451(62)} $ $\dfrac{67~1236}{344(62)} $ $\dfrac{0.86~0.9}{0.88(15)} $中等—优质
), ArticleFig(id=1311999337178162081, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=表1, caption=

研究区烃源岩地球化学数据

, figureFileSmall=null, figureFileBig=null, tableContent=
层位TOC含量/%S1+S2/(mg/g)Tmax/℃HI/(mg/g)Ro/%丰度评价
注:$ \dfrac{0.42~7.05}{2.26\left(21\right)} $表示$ \dfrac{最小值~最大值}{平均值(样品数)} $
长6段 $\dfrac{0.42~7.05}{2.26(21)} $ $\dfrac{0.87~18.88}{5.74(21)} $ $\dfrac{438~454}{446(21)} $ $\dfrac{41~1009}{179(21)} $ $\dfrac{0.84~0.89}{0.86(13)} $中等—好
长7段 $\dfrac{0.68~8.46}{2.84(62)} $ $\dfrac{1.02~47.93}{13.15(62)} $ $\dfrac{438~461}{451(62)} $ $\dfrac{67~1236}{344(62)} $ $\dfrac{0.86~0.9}{0.88(15)} $中等—优质
), ArticleFig(id=1311999337341739938, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Tab.2, caption=

Selected molecular parameters from source rock samples in the study area

, figureFileSmall=null, figureFileBig=null, tableContent=
井号深度层位样品类型ABCDEFGHI
注:A为nC21−/nC22+;B为Pr/nC17;C为Pr/Ph;D为Ph/nC18;E为Ga/C30H;F为C27/C29R;G为C27重排甾烷/(重排甾烷+规则甾烷);H为C30D/C30H;I为C30M/C30H
杨411741.9 m长6段泥岩0.260.451.110.120.150.830.351.050.51
青3976.9 m长6段泥岩0.390.261.150.120.140.780.460.990.39
靖121706.7 m长6段泥岩0.590.452.100.260.130.670.320.970.65
杨411650.0 m长6段泥岩0.520.401.160.200.060.970.181.100.70
茂381946.4 m长7段泥岩0.720.270.850.270.061.110.360.650.41
郝1762282.6 m长7段泥岩1.230.230.960.190.180.850.450.680.68
杨592021.8 m长7段泥岩0.630.360.800.330.180.710.390.520.76
杨411855.0 m长7段泥岩0.680.340.880.250.131.230.280.780.58
青3979.5 m长7段泥岩0.920.380.860.270.140.980.340.570.42
郝1762277.3 m长7段泥岩1.330.240.840.180.170.840.470.640.72
), ArticleFig(id=1311999339334034340, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=表2, caption=

研究区烃源岩生物标志化合物数据

, figureFileSmall=null, figureFileBig=null, tableContent=
井号深度层位样品类型ABCDEFGHI
注:A为nC21−/nC22+;B为Pr/nC17;C为Pr/Ph;D为Ph/nC18;E为Ga/C30H;F为C27/C29R;G为C27重排甾烷/(重排甾烷+规则甾烷);H为C30D/C30H;I为C30M/C30H
杨411741.9 m长6段泥岩0.260.451.110.120.150.830.351.050.51
青3976.9 m长6段泥岩0.390.261.150.120.140.780.460.990.39
靖121706.7 m长6段泥岩0.590.452.100.260.130.670.320.970.65
杨411650.0 m长6段泥岩0.520.401.160.200.060.970.181.100.70
茂381946.4 m长7段泥岩0.720.270.850.270.061.110.360.650.41
郝1762282.6 m长7段泥岩1.230.230.960.190.180.850.450.680.68
杨592021.8 m长7段泥岩0.630.360.800.330.180.710.390.520.76
杨411855.0 m长7段泥岩0.680.340.880.250.131.230.280.780.58
青3979.5 m长7段泥岩0.920.380.860.270.140.980.340.570.42
郝1762277.3 m长7段泥岩1.330.240.840.180.170.840.470.640.72
), ArticleFig(id=1311999339782824869, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=EN, label=Tab.3, caption=

Selected molecular parameters from crude oil in the study area

, figureFileSmall=null, figureFileBig=null, tableContent=
井名深度层位样品类型ABCDEFGHIJK
注:A为nC21−/nC22+;B为Ga/C30H;C为Pr/nC17;D为Ph/nC18;E为Pr/Ph;F为C27/C29R;G为C27重排甾烷/(重排甾烷+规则甾烷);H为C29-αββ/(ααα+αββ);I为C29-20S/(20S+20R);J为C30M/C30H;K为C30D/C30H
新161井1118 m延9段原油0.870.150.310.310.861.070.290.510.510.480.64
天26-141井1011 m延9段原油0.730.130.490.490.910.930.290.510.520.660.68
杨45-11井1000 m延9段原油0.850.210.360.410.790.960.320.510.510.460.41
天21-11井1032 m延9段原油0.740.130.440.440.851.130.280.530.500.520.38
杨加41-151井1026 m延9段原油0.920.130.360.390.851.060.280.500.530.370.53
天9-21井1278 m长2段原油0.820.130.330.380.780.980.230.530.500.420.59
天11-20井1284 m长2段原油0.770.140.330.400.761.140.240.530.500.380.62
), ArticleFig(id=1311999340189672358, tenantId=1146029695717560320, journalId=1311385891987619962, articleId=1311999291145675514, language=CN, label=表3, caption=

研究区原油生物标志化合物数据

, figureFileSmall=null, figureFileBig=null, tableContent=
井名深度层位样品类型ABCDEFGHIJK
注:A为nC21−/nC22+;B为Ga/C30H;C为Pr/nC17;D为Ph/nC18;E为Pr/Ph;F为C27/C29R;G为C27重排甾烷/(重排甾烷+规则甾烷);H为C29-αββ/(ααα+αββ);I为C29-20S/(20S+20R);J为C30M/C30H;K为C30D/C30H
新161井1118 m延9段原油0.870.150.310.310.861.070.290.510.510.480.64
天26-141井1011 m延9段原油0.730.130.490.490.910.930.290.510.520.660.68
杨45-11井1000 m延9段原油0.850.210.360.410.790.960.320.510.510.460.41
天21-11井1032 m延9段原油0.740.130.440.440.851.130.280.530.500.520.38
杨加41-151井1026 m延9段原油0.920.130.360.390.851.060.280.500.530.370.53
天9-21井1278 m长2段原油0.820.130.330.380.780.980.230.530.500.420.59
天11-20井1284 m长2段原油0.770.140.330.400.761.140.240.530.500.380.62
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鄂尔多斯盆地靖边地区延长组长7—长6段烃源岩评价及油源对比
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汤思维 1 , 薛辉 2, 3 , 唐友军 1 , 王淑敏 2, 3 , 胡光明 4 , 李赓 5 , 石方廷玉 4
地质力学学报 | 能源地质 2026,32(4): 842-860
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地质力学学报 |能源地质 2026 , 32 (4) : 842 -860
鄂尔多斯盆地靖边地区延长组长7—长6段烃源岩评价及油源对比
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汤思维1 , 薛辉2, 3, 唐友军1 , 王淑敏2, 3, 胡光明4, 李赓5, 石方廷玉4
作者信息
  • 1油气地球化学与环境湖北省重点实验室(长江大学),湖北 武汉 430100
  • 2中国石油长庆油田分公司勘探开发研究院,陕西 西安 710018
  • 3低渗透油气田勘探开发国家工程实验室,陕西 西安 710018
  • 4长江大学地球科学学院,湖北 武汉 430100
  • 5中国石油长庆油田分公司第一采油厂,陕西 延安 716000
通讯作者:
唐友军(1975—),男,教授,博士生导师,从事非常规和常规油气地质综合评价、无机–有机地球化学结合与古环境、古气候重建研究。Email:
作者简介:

作者贡献声明

唐友军、汤思维、胡光明、薛辉负责论文构思、数据分析、研究方法和论文写作;汤思维、王淑敏参与数据分析和技术手段的实践应用和绘图;汤思维、李赓、石方廷玉参与数据分析、研究方法和修改。所有作者均阅读并同意稿件的提交和发表。

Author’s Contributions

TANG Youjun, TANG Siwei, HU Guangming, and XUE Hui conceived the study, performed data analysis, designed the research methodology, and drafted the manuscript; TANG Siwei and WANG Shumin participated in data analysis, practical application of technical approaches, and figure generation; TANG Siwei, LI Geng and SHI Fangtingyu were involved in data analysis, refinement of the research methodology, and manuscript revision. All authors have read and approved the submission and publication of the manuscript.

汤思维(2000—),女,在读硕士,研究方向为油气地球化学。Email:

Evaluation of hydrocarbon source rocks and oil-source correlation of the Chang 7 and Chang 6 Members of the Yanchang Formation in the Jingbian area, Ordos Basin
Siwei TANG1 , Hui XUE2, 3, Youjun TANG1 , Shumin WANG2, 3, Guangming HU4, Geng LI5, Fangtingyu SHI4
Affiliations
  • 1Hubei Key Laboratory of Petroleum Geochemistry and Environment (Yangtze University), Wuhan 430100, Hubei, China
  • 2Research Institute of Petroleum Exploration and Development, Changqing Oilfield Company, PetroChina, Xi’an 710018, Shaanxi, China
  • 3National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi’an 710018, Shaanxi, China
  • 4School of Geosciences, Yangtze University, Wuhan 430100, Hubei, China
  • 5The First Oil Production Factory, Changqing Oilfield Company, PetroChina, Yan’an 716000, Shaanxi, China
出版时间: 2026-08-28 doi: 10.12090/j.issn.1006-6616.2025050
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鄂尔多斯盆地靖边地区延长组7段(长7段)与延长组6段(长6段)是该区重要的烃源岩层系。然而,目前关于这2套烃源岩的生烃潜力及其对油气成藏贡献的系统研究仍较为薄弱,制约了该区勘探工作的进一步深化。此次研究运用地球化学分析手段,系统刻画了靖边地区长7段与长6段烃源岩的展布特征与地球化学性质,并分析了靖边油田延安组9段(延9段)和延长组2段(长2段)原油的地球化学特征。通过对比该区域长7段、长6段烃源岩与湖盆中心张家滩页岩的地球化学指标,明确了延9段和长2段油藏原油的潜在来源。研究结果表明:长7段烃源岩属中等–优质烃源岩,分布广、厚度大,有机质类型以Ⅰ–Ⅱ2型为主,处于成熟阶段。生物标志物特征显示其母质为混合生源输入,沉积环境偏还原、水体盐度较低。较低的Pr/Ph比值与较高的C27/C29规则甾烷比值(C27/C29R)指示长7段烃源岩有机质以水生藻类等低等生物为主,形成于还原性的淡水–微咸水环境。长6段烃源岩为中等–好烃源岩,有机质类型以Ⅱ2–Ⅲ型为主,整体处于低熟–成熟阶段;中等的Pr/Ph比值与较低的C27/C29R则反映其有机质以陆源高等植物输入为主,沉积环境为弱还原环境。油–源对比结果表明,延9段与长2段原油为同源油,主要来源于靖边地区长7段烃源岩,但长6段烃源岩亦存在一定贡献。湖盆中心张家滩页岩的地球化学特征与延9段、长2段原油差异显著,进一步支持原油主要为本地烃源岩所供烃。此次研究为鄂尔多斯盆地靖边地区油气勘探方向优选与资源潜力评价提供了关键地球化学依据。

鄂尔多斯盆地  /  靖边地区  /  烃源岩评价  /  生物标志化合物  /  油源对比
Objective

The Chang 7 and Chang 6 Members of the Yanchang Formation in the Jingbian area of the Ordos Basin are important source rock intervals. However, systematic studies on their hydrocarbon generation potential and contributions to hydrocarbon accumulation remain limited, which has hindered further exploration efforts in this region. Therefore, this study applies geochemical analytical methods to systematically characterize the distribution and the geochemical properties of the Chang 7 and Chang 6 source rocks in the Jingbian area. In addition, the geochemical signatures of the crude oils from the Yan 9 and Chang 2 reservoirs in the Jingbian Oilfield were investigated.

Methods

By comparing the geochemical parameters of the Chang 7 and Chang 6 source rocks in the study area with those of the Zhangjiatan Shale in the basin center, the potential sources of the Yan 9 and Chang 2 reservoir oils were identified through oil–source correlation.

Results

The Chang 7 source rocks are moderate to excellent-quality source rocks, characterized by wide distribution, large thickness, Type Ⅰ–Ⅱ2 kerogen, and a mature thermal evolution stage. Biomarker characteristics indicate mixed organic matter inputs and deposition under reducing conditions with relatively low salinity. Low Pr/Ph ratios and high C27/C29 regular sterane ratios suggest that the organic matter was predominantly derived from aquatic algae and other lower organisms and accumulated in a reducing freshwater to brackish-water depositional environment. In contrast, the Chang 6 source rocks are moderate to good-quality source rocks, dominated by Type Ⅱ2–Ⅲ kerogen, and generally at the low-maturity to mature stage. Moderate Pr/Ph ratios and relatively low C27/C29 regular sterane ratios indicate a predomint innput of terrigenous higher plantsand deposition under weakly reducing conditions. Oil-source correlation results reveals that the Yan 9 and Chang 2 crude oils have the same originand were primarily sourced from the Chang 7 source rocks, with a minor contribution from the Chang 6 source rocks. The distinct geochemical characteristics of the Zhangjiatan Shale compared with the Yan 9 and Chang 2 crude oils further suggest that the Zhangjiatan Shale was not the major hydrocarbon source for these oils.

Conclusions

(1) The Chang 7 Member is the primary and high-quality source rock in the Jingbian area, exhibiting advantages over the Chang 6 Member in terms of thickness, lateral distribution, organic matter abundance, and hydrocarbon generation potential. (2) Distinct biomarker signatures differentiate the Chang 7 (aquatic/algal-derived organic matter under reducing conditions), Chang 6 (terrigenous organic matter under weakly reducing conditions), and Zhangjiatan Shale (highly aquatic organic matter under strongly reducing conditions) source rocks. (3) The Yan 9 and Chang 2 crude oils share a common origin and were primarily sourced from local Chang 7 source rocks, with possible minor contributions from the Chang 6 source rocks. These oils show no direct genetic relationship with the Zhangjiatan Shale in the basin center, supporting a predominantly local hydrocarbon charging model in the Jingbian area. [Significance] This study provides critical geochemical evidence for understanding the local hydrocarbon system, resolving uncertainties regarding oil sources, and evaluating exploration potential in the Jingbian area of the Ordos Basin.

Ordos Basin  /  Jingbian area  /  source rock evaluation  /  biomarkers  /  oil-source correlation
汤思维, 薛辉, 唐友军, 王淑敏, 胡光明, 李赓, 石方廷玉. 鄂尔多斯盆地靖边地区延长组长7—长6段烃源岩评价及油源对比. 地质力学学报, 2026 , 32 (4) : 842 -860 . DOI: 10.12090/j.issn.1006-6616.2025050
Siwei TANG, Hui XUE, Youjun TANG, Shumin WANG, Guangming HU, Geng LI, Fangtingyu SHI. Evaluation of hydrocarbon source rocks and oil-source correlation of the Chang 7 and Chang 6 Members of the Yanchang Formation in the Jingbian area, Ordos Basin[J]. Journal of Geomechanics, 2026 , 32 (4) : 842 -860 . DOI: 10.12090/j.issn.1006-6616.2025050
鄂尔多斯盆地是当前中国大型原油和天然气生产基地(付金华等,2020),盆地内分布着多个大型油气田,如靖边油气田、苏里格气田、乌审旗气田和神木气田等(付金华等,2023;阎珍等,2024)。
三叠系延长组7段(长7段)是鄂尔多斯盆地的主力烃源岩层系(尹锦涛等,2017;高波等,2022;高攀明,2024),地层厚度介于30~130 m,有机质含量丰富。已有研究主要聚焦于盆地沉积中心,如盆地西部、西南部及南部湖盆区的长7段烃源岩,并已对其生烃潜力开展了系统评价(刘亚洲等,2018;高波等,2022;高攀明等,2024;王子昕等,2024;张新乐等,2024;孙勃等,2025)。王子昕等(2024)对位于鄂尔多斯盆地西南部的庆城地区长7段烃源岩特征开展了研究,指出烃源岩有机质丰度高(总有机碳含量平均值达6.04%)、分布范围广、处于成熟–高成熟演化阶段,且含油性与可动性较好,属于较好–极好级别的烃源岩。然而,针对盆地边缘(如靖边地区)烃源岩生烃潜力研究仍相对薄弱。与长7段相比,长6段烃源岩在鄂尔多斯盆地中的分布较为局限(梁晓伟,2011;贾浩宸等,2023;李婵等,2025)。梁晓伟(2011)基于盆地中西部地区的长6段烃源岩研究认为,从总有机碳含量、氯仿沥青“A”及总烃含量等指标来看,长6段烃源岩属于中等—较好级别的烃源岩,有机质现今处于成熟阶段。由于靖边地区在长6段和长7段沉积时期均处于湖盆边缘位置,暗色泥岩与页岩发育相对薄弱(邓秀芹等,2011;王香增等,2013)。目前对这2套烃源岩在靖边地区的平面展布、纵向发育特征及生烃潜力认识仍不清晰,制约了该区域石油勘探部署。
靖边地区侏罗系延安组9段(延9段)与三叠系延长组2段(长2段)在多口钻井中相继获得工业油流,展现出良好的勘探前景(张瑶瑶等,2023;贺永红等,2023)。但原油来源仍存在争议。主要问题集中于以下2个方面:①目前对当地长6段、长7段烃源岩的生烃潜力及有效性认识仍较为薄弱,难以明确油气究竟源自本地烃源岩,还是来自湖盆中心烃源岩(王秀娟等,2026)。张海等(2018)通过地球化学对比分析指出,延9段原油与靖边地区长7段烃源岩具有较好的亲缘性,可能主要来源于本地长7段烃源岩;而王爱国等(2023)基于志丹—靖边地区的精细油源对比研究,提出延安组原油来源于湖盆中心长7段优质烃源岩,指示了远源成藏的可能。②若确定原油源于本地烃源岩,则需进一步明确其主要贡献层段是长6段还是长7段烃源岩。
针对上述问题,此次研究以鄂尔多斯盆地陕北斜坡中段靖边地区为研究区,选取该区代表性钻井中的长6段与长7段泥页岩岩芯样品,以及延9段、长2段原油样品作为研究对象。对烃源岩样品进行总有机碳含量测定和岩石热解分析,并结合测井与地震资料,明确长6段与长7段烃源岩发育特征及其生烃潜力。进一步对烃源岩抽提物与原油样品进行气相色谱−质谱(GC-MS)分析,并与湖盆中心烃源岩进行生物标志化合物特征系统对比,精细解析延9段、长2段原油的成因与来源,以期为靖边地区油气勘探方向提供依据。
鄂尔多斯盆地位于106°20′—110°30′E、35°—40°30′N之间,总面积约37×104 km2(付金华等,2021;赵靖舟等,2025;图1)。靖边地区位于鄂尔多斯盆地陕北斜坡中段,其西起宁条梁、南抵王家湾、东至魏家楼、北达横山县城(李进步等,2024)。
鄂尔多斯盆地是一个以古生代地台及台缘坳陷与中—新生代台内坳陷叠合为基础的大型克拉通盆地,基底由太古代—古元古代变质结晶岩系构成,其上沉积盖层自下而上发育有古生界和中—新生界地层。其中,中生代地层发育齐全,主要包括三叠系、侏罗系及白垩系。盆地内中生代地层出露完整三叠系延长组,自下而上可划分为10个层段(长10段—长1段)。长10段沉积期以发育河流相沉积为特征(Qiu et al.,2014)。延长组沉积早期,湖盆发生初始坳陷,长9段—长8段以浅湖与三角洲相沉积为主。长7段湖盆进入强坳陷阶段,湖水加深,湖盆范围达到最大,广泛发育深湖相沉积(Duan, 2012)。长6段沉积期湖盆开始收缩,砂体含量逐渐增加,沉积以浅湖相为主,长6油层组进一步划分为长6①、长6②和长6③ 3个亚段。长5段—长2段沉积期间,湖盆经历了短期扩张后逐步萎缩的过程,以浅湖与三角洲相沉积为主;至长1段沉积期湖盆基本消亡(付金华等,2018;)。长7段进一步划分为长7①、长7②和长7③ 3个亚段(付金华等,2018),在长7③亚段的中下部沉积了一套富含有机质的黑色油页岩,即张家滩页岩,被确认为是鄂尔多斯盆地中生界的一套优质烃源岩(付金华等,2013)。早侏罗世晚期,盆地内发育多条古河道,其间发生了填平补齐式的富县组沉积(时志强等,2002),为一套河道充填−湖泊沼泽相地层,与下伏延长组呈不整合接触。富县组可划分为“粗富县”与“细富县”2种沉积组合。“粗富县”主要为冲积扇、砾砂质河道及边滩相沉积,岩性以含砾粗砂岩和中粗砾砂岩等粗碎屑为主;“细富县”则以河漫滩、洪泛平原相为主,岩性为泥岩、粉砂质泥岩和粉砂岩等细碎屑,厚度相对较稳定(李昌昊等,2022)。中侏罗世,盆地再次进入湖盆发育阶段:延10段沉积期主要为曲流河−辫状河沉积环境;延9段、延8段沉积期整体属河湖三角洲沉积体系,岩性组合以泥岩、粉砂岩及中−细粒砂岩夹煤层为特征(袁珍等,2024)。
靖边地区自下而上钻遇地层包括:三叠系延长组,侏罗系富县组、延安组、直罗组、安定组,以及白垩系、新近系和第四系。主要含油层系为长2段、长6段和延9段、延10段(吴悠等, 2025)。
烃源岩样品采集于靖边地区的茂38井、靖12井、杨59井、杨41井、青3井、宝1井以及郝176井,共计83块(图1b)。其中长6段21块、长7段62块;原油样品主要产自延9段和长2段。样品的测试均在长江大学油气地球化学与环境湖北省重点实验室完成。
采用QCE-IV油气评价仪器进行热解实验。首先将岩屑样品进行处理,去除其中的泥浆等杂质。将样品粉碎至200目(75 μm),称取80~120 mg样品于坩埚中。仪器自动进样分析,热解炉升温至300 ℃并恒温3 min以测定S1(游离烃)含量,随后升温至550 ℃以测定S2(裂解烃)含量和Tmax(最大热解峰温),实验过程遵循GB/T 18602—2012《岩石热解分析》(中华人民共和国国家质量监督检验检疫总局和中国国家标准化管理委员会, 2013)。
采用CS230PCHC定碳定硫分析仪测定总有机碳。将烃源岩样品粉碎至200目(75 μm),称取80~120 mg样品,用稀盐酸浸泡2小时去除碳酸盐岩,再用中性离子水多次清洗样品。实验过程遵循GB/T 19145—2022《沉积岩石中总有机碳测定》(国家市场监督管理总局和国家标准化管理委员会, 2022)。
采用Axio Scope AI数字显微煤岩分析系统进行镜质体反射率测试。将烃源岩样品磨碎,挑选米粒大小的样品平铺在磨具中,导入混合好的A、B胶,等胶水自然风干后,开始打磨薄片。依次用1000目(18 μm)、1500目(12.6 μm)、2000目(10.3 μm)进行打磨,磨至薄片表面光滑,再对薄片进行精细抛光。将打磨好的薄片放到光学显微镜下检测其反射率,每个样品随机测量20~30个点并得出平均值。测试环境温度为23 ℃,相对湿度50%,实验过程遵循SY/T 5124—2012《沉积岩中镜质体反射率测定方法》(国家能源局, 2012)。
首先将烃源岩样品破碎至约2 cm,再研磨至200目(75 μm)粉末,采用索氏抽提法对样品粉末处理,提取氯仿沥青“A”。然后,将原油样品与烃源岩氯仿沥青“A”均加入正己烷,放入冰箱沉淀静置24 h后进行沥青质沉淀。沉淀完沥青质的总烃通过固体层析柱(氧化铝与硅胶比3∶2)进行组分分离。配展开剂:纯正己烷;二氯甲烷:正己烷=7∶3混合溶剂;二氯甲烷:甲醇=95∶5混合溶剂,依次滴入配好的展开剂,分别分离出饱和烃、芳烃、非烃。
采用安捷伦7890A-5973气相色谱−质谱联用仪对饱和烃进行分析。实验条件为:进样口温度260 ℃,高纯氦气载气流量1.2 mL/min。升温程序为初始温度80 ℃,以4 ℃/min升温至290 ℃并保持30 min。离子源采用EI源,温度230 ℃,四级杆温度150 ℃,电离能70 eV,接口温度280 ℃。
长6段泥岩以深灰色为主,长7段泥岩多为深灰色、灰黑色(图2),烃源岩的颜色特征表明,碎屑物的沉积环境水动力条件弱(付金华等,2018)。
杨41井长6①亚段岩性以灰绿色细砂岩和灰黑色泥岩互层发育为主,局部夹少量泥质细砂岩,整体表现为砂泥交互沉积特征。沉积环境以三角洲平原向三角洲前缘过渡为主,主要发育分支河道和陆上天然堤微相,局部可见沼泽沉积,并向下或侧向逐渐过渡为水下分支河道和水下天然堤沉积,反映出较为典型的三角洲平原−前缘过渡带沉积特征(图3a)。
靖12井长6②—长6③亚段主要发育灰绿色细砂岩和灰黑色泥岩,沉积于三角洲平原至前缘相沉积环境,主要微相包括分支河道、陆上天然堤、沼泽以及水下分支河道和水下天然堤(图3b)。
宝1井长6③亚段岩性以灰绿色细砂岩、灰黑色泥质细砂岩及粉砂岩为主,局部夹灰黑色泥岩薄层,主要沉积于三角洲平原相,发育有分支河道、陆上天然堤、沼泽微相(图3c)。
宝1井长7①亚段岩性以灰绿色细砂岩、深灰色泥质细砂岩为主,局部夹灰黑色泥岩薄层,整体呈现三角洲前缘沉积特征,主要发育水下分支河道、水下天然堤及支流间湾微相,在河口坝和水下分支河道微相沉积了薄层泥岩或泥质粉砂岩(图3)。
整体上看,杨59井长7②—长7③亚段岩性整体以灰绿色细砂岩、灰黑色泥质细砂岩及深灰色泥岩为主,发育典型的砂泥岩互层结构。其中,长7②亚段砂岩更为发育,而向上至长7③亚段,泥岩比例显著增加,整体呈现出自下而上由砂质主导向泥质主导过渡的岩性序列。该层段沉积环境整体属三角洲前缘相,主要发育水下分流河道、水下天然堤及分流间湾等微相。具体而言,长7②亚段以高能的水下分流河道和水下天然堤沉积为主,反映了较强的水动力条件;而长7③亚段则表现为分流间湾沉积显著增多,指示沉积能量减弱,更有利于细粒物质堆积。这种垂向上的岩相与微相组合变化,清晰记录了三角洲前缘内部由高能环境向低能环境演化的沉积过程(图3d)。
有机质丰度是评价烃源岩生烃潜力的关键指标,通常采用总有机碳(TOC)含量和生烃潜量(S1+S2)进行表征。长6段、长7段烃源岩样品实验分析数据见表1。根据《陆相烃源岩有机质丰度评价标准》(SY/T 5735—1995)(石油地质勘探专业标准化委员会,1996),烃源岩样品的有机碳达标率(TOC含量 > 0.4%)较高,反映出绝大多数样品均达到有效烃源岩的门限。
长6段烃源岩TOC含量介于0.42%~7.05%,均值为2.26%;S1+S2介于0.87~18.88 mg/g,均值为5.74 mg/g,整体达到中等–好烃源岩级别(表1);长7段烃源岩TOC含量介于0.68 %~8.46 %,均值为2.84 %;S1+S2介于1.02~47.93 mg/g,均值为13.15 mg/g,综合评价为中等—优质级别(表1)。相比较而言,长7段的TOC含量与S1+S2的普遍高于长6段(表1,图4)。
长6段烃源岩的有机质类型总体为Ⅱ2–Ⅲ型,其氢指数(HI)范围为41~1009 mg/g,平均值为179 mg/g(图5;表1);长7段烃源岩的有机质类型主要为Ⅰ–Ⅱ2型,干酪根类型优于长6段,氢指数(HI)范围为67~1236 mg/g,平均值为344 mg/g(图5,表1)。
镜质体反射率(Ro)和最高热解峰温(Tmax)是评价有机质成熟度的2个重要参数(李志强等,2024)。基于上述参数分析,长6段和长7段烃源岩均处于成熟阶段,具备生油能力。其中,长6段烃源岩的Ro值介于0.84~0.89 %,均值为0.86 %;长7段烃源岩的Ro值介于0.86~0.90 %,均值为0.88 %,反映该区烃源岩整体已达到成熟演化阶段(图6a,表1)。
Tmax值随热演化程度加深而升高,并与Ro值表现出良好的相关性,因此可作为Ro的有效补充指标用于有机质成熟度评价。长6段烃源岩的Tmax分布范围为442~452 ℃,均值为446 ℃(图6b,表1);长7段烃源岩的Tmax分布范围为438~461 ℃,均值为450 ℃(图6b,表1),进一步印证了研究区烃源岩整体处于成熟演化阶段。
基于靖边地区长6段与长7段岩芯的有机地球化学分析数据(图7),此次研究选取了地球化学数据较为完整的6口重点井分析长7段烃源岩的纵向展布特征(图7a—7f、7j),选取3口重点井研究长6段烃源岩的纵向分布(图7g—7i、7k)。同时,基于6口单井的泥岩厚度统计与测井TOC预测结果,明确了各井点烃源岩累计厚度,并编制了研究区烃源岩厚度分布图(图8)。所有井数据均为此研究首次系统提供,未引用外部资料。
纵向对比表明,长6段烃源岩平均厚度较小,垂向分布局限;长7段烃源岩平均厚度约25 m,垂向连续性较好,且有机质丰度与品质普遍高于长6段(图7)。
通过厚度分布图(图8)综合分析,长6段与长7段烃源岩在平面上均呈现“西南厚、东北薄”的趋势,但具体特征存在差异。长6段厚度总体由西南向东北逐渐减薄,西南部最厚可达45 m,向东北方向明显减薄,呈条带状或局部斑块状分布,连续性较差,非均质性强(图8a);长7段同样具有西南厚、东北薄的趋势,最大厚度可达50 m,且分布范围明显广于长6段,整体呈片状、局部连片分布,虽具非均质性,但连续性相对较好(图8b)。烃源岩横向分布差异主要受沉积环境与古地理格局控制,西南部在长6段—长7段沉积期处于三角洲相,向东北方向水体变浅,烃源岩发育程度随之降低。
综上,靖边地区长7段烃源岩在厚度、分布范围及生烃潜力上均优于长6段。受环境、物源及构造共同控制,两者均呈西南厚、东北薄发育特征,西南部为烃源岩最有利发育区,深部层系可能具有相似的发育特征。
正构烷烃是烃源岩及未受生物降解原油中最主要的化学成分之一,其碳数分布模式可用于反映有机质的来源特征、热演化程度以及沉积环境。并用相对丰度表征各化合物色谱峰响应强度的相对变化。长6段与长7段典型烃源岩样品的正构烷烃分布特征较为相似,均呈单峰型、近似正态分布,碳数范围分布于nC16~nC34,主峰碳分布集中于nC21~nC23(图9)。长6段烃源岩的nC21−/nC22+比值介于0.26~0.59,均值为0.44,整体处于较低水平,指示其正构烷烃以长链组分为主,反映有机质母质来源以陆源高等植物占优势(Eglinton and Hamilton,1967);长7段烃源岩的nC21−/nC22+比值介于0.63~1.33,均值为0.91,反映其有机质来源为低等水生生物与陆源高等植物的混合输入(表2)。作为对比,张家滩页岩的nC21−/nC22+比值介于0.80~3.42,均值为2.43(黄彦杰等,2020a;黄彦杰等,2020b),表明其母质以低等水生生物为主。
姥鲛烷(Pr)与植烷(Ph)作为一对重要的类异戊二烯烃类生物标志物,广泛存在于原油和烃源岩中(杨孝勇等,2022)。已有的系统研究表明,高姥植比(Pr/Ph > 3.0)指示陆源有机质在氧化环境条件下的输入,而低值( < 0.8)则通常指示缺氧环境,介于0.80~3.00指示弱还原环境(Didyk et al.,1978; Peters et al.,2005;刁慧等,2026)。长7段烃源岩的Pr/Ph比值介于0.80~0.96,均值为0.82,表明形成于弱还原环境(表2)。而长6段烃源岩的Pr/Ph比值介于1.02~1.34,均值为1.21,指示弱还原环境。张家滩页岩烃源岩的Pr/Ph比值介于0.56~0.86,均值为0.62(黄彦杰,2020a),指示还原环境。此外,在Pr/nC17与Ph/nC18交汇图中显示出三者沉积时氧化还原条件的区别(图10)。
烃源岩中常见的萜类化合物主要包括三环萜烷和五环三萜烷(Peters et al.,1991;魏志福等,2015;冯乔等,2018;杨孝勇等,2022)。烃源岩样品中检测到完整的C19-29三环萜烷(TT)系列(图11)。长6段烃源岩以C19三环萜烷为主,呈“下降型”分布模式;长7段以C23三环萜烷为主,呈“上升型”分布,少数样品中C20或C22三环萜烷占优势,呈现“山峰型”分布。较高的C19TT和C20TT含量通常指示陆源有机质输入较多(刘如红等,2019)。长6段三环萜烷呈C19TT > C20TT > C21TT的递减序列,反映较强的陆源贡献;长7段则表现为C19TT < C20TT < C21TT的递增模式,表明水生生物输入占优。此外,中碳数三环萜烷(C23-26TT)的相对富集通常与偏还原沉积环境及低等水生生物输入有关(陈哲龙等,2017)。长7段C23-26TT含量高于长6段,说明其沉积环境更偏还原,且低等水生生物贡献更为显著。
五环三萜烷主要包括藿烷系列以及非藿烷系列(Sinninghe Damsté et al.,1995;冯乔等,2018)。烃源岩样品中藿烷系列中主要包括C29-35正常藿烷、C30重排藿烷、C30莫烷等,非藿烷系列主要包括伽马蜡烷等(图11)。伽马蜡烷常用来指示沉积环境的盐度,其相对含量通常以伽马蜡烷/C30藿烷(伽马蜡烷指数Ga/C30H)表示(Sinninghe Damsté et al.,1995;冯乔等,2018)。长6段烃源岩的Ga/C30H介于0.06~0.15,均值为0.12(图11a,表2);长7段该指数介于0.06~0.18,均值为0.14,表明烃源岩形成于淡水环境(图11b)。
在沉积物及化石燃料中,甾醇经过成岩作用转化为甾烷,其分布特征可为判别沉积环境中的初级生产者来源(如藻类、高等植物)提供关键信息(Yang et al.,2023)。原油与烃源岩中几乎普遍存在由C27、C28、C29规则甾烷组成的“三联体”,它们之间的相对丰度是评估湖泊沉积物中高等植物与水生藻类相对输入贡献的有效指标(代宇等,2022)。长6段烃源岩C27规则甾烷的相对丰度低于C29规则甾烷,这表明原油来源于水生藻类和高等植物的混合有机质输入,且高等植物的贡献略占优势(图11c);长7烃源岩呈现出明显的C27规则甾烷优势相对于C29规则甾烷,指示混合来源特征,但以低等水生生物输入为主(图11d)。
随成熟度升高,重排甾烷相对丰度逐渐增加,其与规则甾烷的比值亦增大。C27重排甾烷/(C27重排甾烷+C27规则甾烷)是常用的成熟度指标(唐建云等,2016)。长6段该比值介于0.18~0.46,均值为0.33,显示烃源岩处于成熟阶段;长7段比值介于0.28~0.47,均值为0.39,表明烃源岩整体已进入成熟演化阶段(表2)。
生物标志化合物参数的差异能够有效反映不同层位以及不同区域烃源岩在有机质来源、成熟度及沉积环境方面的特征。通过对长6段和长7段烃源岩生物标志物数据的系统对比,长6段表现为中等Pr/Ph比值、低Ga/C30H、高C30重排藿烷/C30正常藿烷(C30D/C30H)和C30莫烷/C30正常藿烷(C30M/C30H)以及低C27/C29规则甾烷(C27/C29R)(图12a);长7段则表现为较低的Pr/Ph比值、较低的Ga/C30H、中等的C30重排藿烷/C30正常藿烷(C30D/C30H)和C30莫烷/C30正常藿烷(C30M/C30H)以及较高的C27/C29规则甾烷(C27/C29R)(图12b)。张家滩页岩具有低Pr/Ph比值、中等Ga/C30H、低C30重排藿烷/C30正常藿烷(C30D/C30H)和C30莫烷/C30正常藿烷(C30M/C30H)以及较高C27/C29规则甾烷(C27/C29R)(图12c)。上述分布特征表明,靖边地区长7段烃源岩与张家滩页岩有机质来源主要为水生藻类及低等生物,沉积环境为还原环境,水体盐度较低,但相较而言,张家滩页岩水生低等生物的输入比例更大,沉积环境的还原性更强,可能存在一定程度的水体分层。长6段烃源岩母质来源以陆源高等植物为主,沉积环境为弱还原环境。
所有原油样品均检出完整的正构烷烃系列,碳数分布范围为nC13~nC35,整体呈近似正态分布(图13a、13b)。色谱基线平直,未出现明显的“UCM鼓包”,表明样品未经历显著生物降解作用或影响有限。延9段原油的nC21−/nC22+比值介于0.73~0.92,均值为0.82,长2段原油的nC21−/nC22+比值介于0.77~0.82,均值为0.80,反映其原始母质来自低等水生生物和陆源高等植物的混合贡献。延9段原油的Pr/Ph值介于0.79~0.91,均值0.85;长2段原油的Pr/Ph值介于0.76~0.78,均值0.77,指示两类原油均形成于偏还原沉积环境(表3)。
原油中检出完整的C19-29三环萜烷系列(图13c、13d),多数样品以C23三环萜烷为主峰,呈“弱上升型”分布;藿烷系列以C30藿烷占绝对优势。延9段原油的伽马蜡烷指数(Ga/C30H)介于0.13~0.20,均值为0.15;长2段原油的Ga/C30H值介于0.13~0.14,均值为0.14。上述参数表明原油形成于淡水环境,并已进入成熟演化阶段。规则甾烷呈“V”型分布(图13e、13f),延9段原油的C27/C29R比值介于0.93~1.13,均值为1.03;长2段原油C27/C29R比值介于0.98~1.14,均值为1.08(表3),反映其烃源岩母质以低等水生生物为主,与其他生物标志物指标所揭示的特征一致
甾烷化合物中热稳定性较低的ααα构型和R构型会随热演化程度升高向更稳定的αββ构型和S构型转化(Seifert and Moldowan,1986;李素梅等,2002)。因此,C29甾烷的ββ/(ββ+αα)与20S/(20S+20R)值是有效的成熟度指标,对未熟−成熟阶段具有较高指示意义(Seifert and Moldowan,1986)。延9段原油的C29-αββ/(ααα+αββ)值介于0.50~0.53,均值0.51;C29-20S/(20S+20R)值介于0.50~0.53,均值0.51。长2段原油的C29-αββ/(ααα+αββ)均值为0.53,C29-20S/(20S+20R)均值为0.50(表3)。从C29-αββ/(ααα+αββ)与C29-20S/(20S+20R)关系图(图14)进一步表明,研究区所有原油样品均已进入成熟阶段。
尽管油气在运移、聚集及后期演化过程中其物理化学性质会发生一定变化,但其与源岩之间的亲缘关系仍可通过某些稳定的地球化学指标得以追溯。例如,化学组成的相似性、生物标志化合物的指纹特征以及特定分子比值在油−岩对比中通保持相对稳定,而非同源油气则缺乏此类关联性,这构成了油气源对比的理论基础(Peters et al.,2005)。
为有效识别和区分烃源岩的地球化学特征,常采用来源指标如C27-C28-C29规则甾烷三角图,以及沉积环境指标如Pr/nC17与Pr/Ph关系图等进行综合判别。此次研究将靖边地区长6段、长7段烃源岩、张家滩页岩以及长2段和延9段原油的相关参数投点于上述图件中,两类图件所反映的亲缘关系结果高度一致。分析结果显示,长2段、延9段原油地球化学特征与张家滩页岩差异显著,而与长7段烃源岩表现出明显的亲缘关系。此外,长6段烃源岩对长2段与延9段原油亦可能存在部分贡献(图15a、15b)。
鄂尔多斯盆地延长组发育特征生物标志物为重排藿烷,其中C30重排藿烷的相对丰度主要受烃源岩岩性及沉积环境氧化还原程度控制。张文正等(2016)利用C30重排藿烷/藿烷及C30M/C30H指标对延长组烃源岩进行了有效划分,清晰识别出长7段暗色泥岩与油页岩的地球化学差异。文章在此基础上,进一步整合已有文献中张家滩页岩相关地球化学数据,并运用上述指标对长2段与延9段原油开展油源对比分析。结果表明,研究区长2段与延9段原油主要来源于当地长7段烃源岩,本地长6段烃源岩亦可能有部分贡献(图15c、15d)。研究结论与鄂尔多斯盆地地质演化认识基本一致(张海等,2018)。
(1)靖边地区主力烃源岩为长7段。长7段烃源岩厚度大、分布广,有机质丰度高、类型好(Ⅰ−Ⅱ2型),处于成熟−高成熟阶段,是区内优质烃源岩。相比之下,长6段烃源岩厚度薄、分布局限,有机质丰度中等、类型以Ⅱ2−Ⅲ型为主,整体处于成熟阶段,长6段为中等−好级别烃源岩但潜力与规模有限,可作为烃源岩但生烃潜力低于长7段。
(2)生物标志化合物特征揭示长6段与长7段烃源岩在母质来源与沉积环境上差异显著。长7段烃源岩具低Pr/Ph、低伽马蜡烷指数及高C27/C29规则甾烷比值,指示其母质以水生低等生物为主,沉积于偏还原的淡水环境;而长6段烃源岩表现为中等Pr/Ph、较低的C27/C29规则甾烷比值,反映其母质以陆源高等植物输入为主,沉积环境为弱还原环境。
(3)油源对比分析表明,延9段与长2段原油的分子地球化学特征与长7段烃源岩高度匹配,指示长7段为主要供烃层系,长6段烃源岩可能具有次要贡献;而原油与湖盆中心的张家滩页岩未显示明确亲缘关系,进一步证实靖边地区原油主要来源于靖边地区的本地烃源岩。

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doi: 10.12090/j.issn.1006-6616.2025050
  • 接收时间:2025-05-13
  • 首发时间:2026-09-30
  • 出版时间:2026-08-28
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  • 收稿日期:2025-05-13
  • 修回日期:2026-01-04
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    1油气地球化学与环境湖北省重点实验室(长江大学),湖北 武汉 430100
    2中国石油长庆油田分公司勘探开发研究院,陕西 西安 710018
    3低渗透油气田勘探开发国家工程实验室,陕西 西安 710018
    4长江大学地球科学学院,湖北 武汉 430100
    5中国石油长庆油田分公司第一采油厂,陕西 延安 716000

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唐友军(1975—),男,教授,博士生导师,从事非常规和常规油气地质综合评价、无机–有机地球化学结合与古环境、古气候重建研究。Email:
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2种不同金属材料的力学参数
科
Family
属数
Number of
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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