天然气地球科学

• 天然气地质学 • 上一篇    下一篇

雅布赖盆地小湖次凹细粒沉积岩岩相特征与沉积环境探

张少敏,操应长,朱如凯,王尉,涂建琪,毛治国,白斌   

  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.中国石油勘探开发研究院,北京 100083)
  • 收稿日期:2015-04-20 修回日期:2015-07-13 出版日期:2016-02-10 发布日期:2016-02-10
  • 通讯作者: 操应长(1969),男,安徽潜山人,教授,博士生导师,主要从事沉积学及油气储层地质学方面的教学与科研工作. Email:cyc8391680@163.com.
  • 作者简介:张少敏(1989),女,山东东营人,博士研究生,主要从事沉积学和油气储层地质学研究. Email:zhangshaomin0813@126.com.
  • 基金资助:

    国家自然科学基金石油化工联合基金重点项目(编号:U1262203);国家重点基础研究发展计划(“973”)项目(编号:2014CB239002);中央高校基本科研业务费专项资金资助(编号:15CX06009A);中国石油天然气股份有限公司重大科技专项(编号:2012E3302)联合资助.

The lithofacies and depositional environment of finegrained sedimentaryrocks of Xiaohu Subsag in Yabulai Basin

Zhang Shaomin,Cao Yingchang,Zhu Rukai,Wang Wei,Tu Jianqi,Mao Zhiguo,Bai Bin   

  1. (1.School of Geosciences,China University of Petroleum(east china),Qingdao 266555,China;
    2.Research Institute of Petroleum Exploration & Development,Beijing 100083,China)
  • Received:2015-04-20 Revised:2015-07-13 Online:2016-02-10 Published:2016-02-10

摘要:

通过岩心观察、薄片鉴定、X射线衍射、有机碳分析等技术,综合矿物成分、有机质含量、沉积构造等因素,对雅布赖盆地小湖次凹新河组下段半深湖—深湖细粒沉积岩岩相进行研究,形成了细粒沉积岩四组分三端元的岩相划分方案。结果表明:新河组下段半深湖—深湖细粒沉积岩发育9种岩相类型,其中以贫有机质块状黏土质细粒长英沉积岩、贫有机质纹层状硅质碎屑型混合细粒沉积岩、贫有机质块状长英质黏土岩、中有机质纹层状硅质碎屑型混合细粒沉积岩、中有机质纹层状长英质黏土岩、富有机质纹层状碳酸盐型混合细粒沉积岩等6种岩相为主。岩相类型与特征反映沉积环境和沉积机理的差异,在前三角洲—半深湖的环境中,波浪增强型沉积物重力流普遍发育,形成纵向上贫有机质块状黏土质细粒长英沉积岩—纹层状硅质碎屑型混合细粒沉积岩—块状长英质黏土岩的叠置,反映水动力渐弱的过程;在半深湖—深湖环境中,水体相对安静,悬浮沉积为主,陆源碎屑输入少,碳酸盐和黏土较发育,形成中—富有机质纹层状混合细粒沉积岩和黏土岩。

关键词: 细粒沉积, 岩相特征, 沉积环境, 新河组, 雅布赖盆地

Abstract:

Taking the finegrained sedimentary rocks of the lower Xinhe Formation in Yabulai Basin as a research object,the lithofacies were subdivided using “four componentsthree endmembers” classification scheme with integrated analysis of minerals,structures and organic carbon content by core observation,thin section identification,Xray diffraction and organic carbon test. The results showed that there were nine lithofacies types that could be identified in the finegrained sedimentary rocks of the lower Xinhe Formation,and six of them are mainly developed,which were organiclean massive clayrich siltstone,organiclean laminated siliceous mixed finegrained sedimentary rocks,organiclean massive felsic claystone,organiccontained laminated siliceous mixed finegrained sedimentary rocks,organiccontained laminated felsic claystone and organicrich laminated carbonate mixed finegrained sedimentary rocks. The different lithofacies types and characteristics reflected the differences of sedimentary environment and depositional mechanism. In the prodelta to semideep lacustrine,the waveenhanced sediment gravity flows are widely developed,which formed the superimposed deposition combination of organiclean massive clayrich siltstonelaminated siliceous mixed finegrained sedimentary rocksmassive felsic claystone from bottom to top. In the semideep to deep lacustrine,the water was relatively quiet with a small amount of terrigenous clast input,and the carbonate and clays were more developed,forming organiccontained to rich laminated mixed finegrained sedimentary rocks and claystones.

Key words: Finegrained sediments, Lithofacies, Depositional environment, Xinhe Formation, Yabulai Basin

中图分类号: 

  • TE121.3+1

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