鄂尔多斯盆地林镇地区延安组延9油层组地层对比与沉积微相展布

何金先，段毅，张晓丽，吴保祥，徐丽，夏嘉

doi:10.11764/j.issn.1672-1926.2012.02.291

天然气地球科学 >

2012 , Vol. 23 >Issue 2: 291 - 298

DOI: https://doi.org/10.11764/j.issn.1672-1926.2012.02.291

天然气地质学

鄂尔多斯盆地林镇地区延安组延9油层组地层对比与沉积微相展布

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1.中国科学院油气资源研究重点实验室，甘肃兰州 730000；
2.中国科学院研究生院，北京 100049

何金先(1983-)，男，广西南宁人，博士研究生，主要从事油气成藏与油气地质学研究.E-mail:he2003jin@163.com.

收稿日期: 2011-09-07

修回日期: 2012-01-16

网络出版日期: 2012-04-10

基金资助

国家重点基础研究发展计划“973”项目(编号:2005CB422105)；国家自然科学基金项目(编号:40872092)；中国科学院院地合作局支甘项目联合资助.

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Stratigraphic Correlation and Sedimentary Microfacies of Yan 9 Subsection of Yan′an Formation in Linzhen Area,Ordos Basin

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1.Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China

Received date: 2011-09-07

Revised date: 2012-01-16

Online published: 2012-04-10

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摘要

地层对比划分是石油地质研究的重要基础，而沉积相研究则有利于揭示油气的形成和油藏赋存规律。通过利用延安组煤层和炭质泥岩标志层、古剥蚀面、区域性洪泛事件标志以及沉积相分析，对鄂尔多斯盆地林镇地区延9油层组进行精细地层对比与划分，自下而上划分为延9₃、延9₂、延9₁共3个小层，并分析延9油层组的分布特征。研究认为林镇地区延9油层组为河流相沉积，主要发育河道、河漫滩、心滩及边滩等微相，其中延9₃油层组为辫状河流沉积，部分河道形态呈现一定的准“曲流化”，普遍出现漫滩沼泽微相，心滩的砂体自延10期以来最为发育；延9₂油层组为辫状曲流河沉积，漫滩沼泽微相和边滩微相较为发育；延9₁油层组为网状河流沉积，漫滩沼泽微相是最主要的沉积微相单元，研究区绝大部分地区均有厚层的含炭质泥岩以及煤层的分布，边滩的分布规模和发育厚度相对减弱。同时根据地层对比、沉积相研究以及油藏剖面分析发现研究区延9油藏的圈闭类型最主要为构造—岩性圈闭油藏，少量为构造圈闭油藏和岩性圈闭油藏。

关键词： 鄂尔多斯盆地; 林镇地区; 延安组; 延9油层组; 地层对比; 沉积微相; 油藏类型

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何金先，段毅，张晓丽，吴保祥，徐丽，夏嘉 . 鄂尔多斯盆地林镇地区延安组延9油层组地层对比与沉积微相展布[J]. 天然气地球科学, 2012 , 23(2) : 291 -298 . DOI: 10.11764/j.issn.1672-1926.2012.02.291

Abstract

Correlation and classification of formation is basic of petroleum geology.Sedimentary faces are beneficial to reveal the law of gas-oil formation and occurrence.By means of determination of Yan′an Formation coal beds,carbonaceous mudstone marker beds,palaeo-eroded surface,regional landform flood-event markers and sedimentary analysis,we classify the Yan 9 oil-bearing formation of Linzhen area in Ordos basin into three small layers,such as Yan 9₃,Yan 9₂and Yan9₁ from bottom to top.We also describe the distribution of Yan 9 Formation.The results show that the Linzhen area was a fluvial facies sedimentary area,mainly consisted of channel,alluvial flat,mid\|channel bar and point bar sedimentary microfacies.During Yan 9₃ Period,the sedimentary environment was the braid river;some channels were quasi-meandering and back-swamp sedimentary environments.Sand body of mid\|channel bar was most developed since Yan 10 Period.During Yan 9₂ Period,the sedimentary environment was the braided meandering fluvial,associated with back-swamp and point bar microfacies.During Yan 9₁Period,the sedimentary environment was the braided river,and the main sedimentary microfacies unit was back-swamp.Thus,the scale and thickness of the point bar decreased in this period.Massive carbonaceous mudstone and coal was formed in most of the research area.According to stratigraphic correlation,sedimentary facies and description of oil reservoir profile,the structural-litho-trap should be considered as dominating types of Yan 9 reservoir and the structural traps and lithologic traps were secondary.

Key words： Ordos basin;Linzhen area; Yan′an Formation; Yan 9 subsection; Stratigraphic correlation and classification; Sedimentary microfacis; Reservoir types.

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