天然气地球科学

• 天然气地质学 • 上一篇    下一篇

渤海湾盆地渤南洼陷北部沙四上亚段储层有利成岩相研究

刘小岑,林承焰,任丽华,马鹏杰,陈雁雁   

  1. 1.中国石油大学(华东)地球科学与技术学院,山东 青岛 266580;
    2.山东省油藏地质重点实验室,山东 青岛 266580
  • 收稿日期:2017-06-09 修回日期:2017-09-07 出版日期:2017-11-10 发布日期:2017-11-10
  • 通讯作者: 任丽华(1979-),女,山东东营人,副教授,博士,主要从事储层地质学及油藏描述、油气地质与勘探研究与教学工作。 E-mail:rlh_79@163.com
  • 作者简介:刘小岑(1991-),女,山东青岛人,硕士研究生,主要从事油气储层地质及油藏描述研究.E-mail:liuxiaocenn@163.com.
  • 基金资助:


    国家科技重大专项(编号:2017ZX05009-001)资助.

Study on favorable diagenetic facies of reservoirs in the upper fourth member of Shahejie Formation in north zone of Bonan Sag,Bohai Bay Basin

Liu Xiao-cen,Lin Cheng-yan,Ren Li-hua,Ma Peng-jie,Chen Yan-yan   

  1. 1.School of Geosciences,China University of Petroleum(East China),Qingdao 266580,China;
    2.Shandong Key Laboratory of Reservoir Geology,Qingdao 266580,China
  • Received:2017-06-09 Revised:2017-09-07 Online:2017-11-10 Published:2017-11-10

摘要:

利用铸体薄片、阴极发光、扫描电镜、黏土矿物X-射线衍射等手段,对渤南洼陷北部沙四上亚段储层有利成岩相进行了系统研究。结果表明,储层主体处于中成岩A期—B期,在酸碱交替的成岩环境控制下,整体经历多期胶结、溶解和交代的演化过程。根据成岩作用类型及强度,将沙四上亚段储层划分为6种成岩相:硅质胶结—长石溶蚀相(Ⅰ)、绿泥石胶结相(Ⅱ)、中等压实—弱胶结相(Ⅲ)、压实致密相(Ⅳ)、碳酸盐胶结相(Ⅴ)和杂基重结晶相(Ⅵ)。不同成岩相的成岩和物性演化存在差异,导致储层质量明显不同。成岩相Ⅰ以长石溶蚀和硅质胶结作用为主,长石溶蚀增孔作用显著,次生孔隙发育。成岩相Ⅱ和Ⅲ分别发育早期绿泥石胶结和早期烃类充注,对后期胶结物的形成具有抑制作用,原生孔隙得以保存。成岩相Ⅰ、Ⅱ和Ⅲ储层物性好,含油级别较高,试油资料显示具有较高产能,为研究区有利成岩相。成岩相Ⅳ、Ⅴ、Ⅵ分别以压实作用、碳酸盐胶结作用和杂基重结晶作用为主,储层物性差,含油级别低,基本不具备产油能力,为研究区不利成岩相。
 

关键词: 成岩相, 成岩作用, 物性差异演化, 沙四上亚段, 渤南洼陷北部

Abstract:

A comprehensive study on favorable diagenetic facies of reservoirs in Ess4 in the northern zone of Bonan Sag was carried out utilizing thin sections,SEM,cathodoluminescence and clay mineral X-ray diffraction.The study results show that the reservoir was in an A-B stage of middle diagenesis phase.With multi-period of acid-alkaline fluid evolution,the reservoir went through a complex evolution of multiple cementation,dissolution and metasomatism.Based on diagenetic type and intensity,six types of diagenetic facies are identified as follows,quartz cementation-feldspar dissolution facies(Ⅰ),chlorite cementation facies(Ⅱ),medium compaction-weak cementation facies(Ⅲ),tightly compacted facies(Ⅳ),carbonate cementation facies(Ⅴ) and matrix recrystallization facies(Ⅵ).The diagenetic and physical evolution of diagenetic facies is different,resulting in significantly different reservoir quality.Facies Ⅰ develops feldspar dissolution and quartz cementation with high content of secondary pores.Facies Ⅱ and Ⅲ develop early chlorite cementation and early hydrocarbon filling respectively,which have an inhibitory effect on the later formation of cements,thus preserving the primary pores.Facies Ⅰ,Ⅱ and Ⅲ have good physical properties,high oil contents and high productivity,and are favorable diagenetic facies in the study area.Facies Ⅳ,Ⅴ and Ⅵ develop compaction,carbonate cementation and matrix recrystallization respectively,and have bad physical properties,low oil contents and low oil production capacity,thus being unfavourable diagenetic facies.

Key words: Diagenetic facies, Diagenesis, Physical differential evolution, The upper fourth member of Shahejie Formation, North zone of Bonan Sag

中图分类号: 

  • TE122.2

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