地学前缘 ›› 2018, Vol. 25 ›› Issue (4): 198-209.DOI: 10.13745/j.esf.yx.2017-5-2

• 盆地与资源 • 上一篇    下一篇

湖相细粒混合沉积岩岩石类型划分：以准噶尔盆地吉木萨尔凹陷二叠系芦草沟组为例

张少敏，操应长，朱如凯，葸克来，王健，朱宁，户瑞宁   

  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. 青岛海洋科学与技术国家实验室 海洋矿产资源评价与探测技术功能实验室, 山东 青岛 266071
    3. 中国石油勘探开发研究院, 北京 100083
  • 收稿日期:2017-01-05 修回日期:2017-04-27 出版日期:2018-07-15 发布日期:2018-07-15
  • 基金资助:
    国家自然科学基金石油化工联合基金重点项目(U1762217)；国家重点基础研究发展计划“973”项目(2014CB239002)；中央高校基本科研业务费专项(15CX06009A)

Lithofacies classification of finegrained mixed sedimentary rocks in the Permian Lucaogou Formation, Jimsar sag, Junggar Basin.

ZHANG Shaomin,CAO Yingchang,ZHU Rukai,XI Kelai,WANG Jian,ZHU Ning,HU Ruining   

  1. 1. School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China
    2. Evaluation and Detection Technology Laboratory of Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
    3. Research Institute of Petroleum Exploration & Development, Beijing 100083, China
  • Received:2017-01-05 Revised:2017-04-27 Online:2018-07-15 Published:2018-07-15

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摘要： 通过岩心观察、薄片鉴定、扫描电镜分析、物性测试等技术手段，以吉木萨尔凹陷二叠系芦草沟组致密细粒沉积岩为研究对象，开展了岩相类型及特征的精细分析。研究结果表明：(1)致密细粒沉积岩矿物成分复杂、岩石组分多样，包括陆源碎屑组分、火山碎屑组分和碳酸盐组分，是一种过渡类型的混合沉积岩；(2)综合物质组分、沉积构造、有机质特征等因素，划分细粒混合沉积岩岩相类型，主要包括单一组分岩相和多组分混杂岩相两种类型，每一类岩相具有多种沉积构造，包括块状、条带团块状和纹层状等类型；(3)研究区主要发育块状泥晶云岩相、块状粉砂质砂屑云岩相、块状凝灰质粉砂岩相、条带状含凝灰云岩相、纹层状粉砂质/泥质沉凝灰岩相和纹层状云质泥岩相等，不同岩相类型的储集物性、孔喉结构特征以及储集空间类型存在差异，其中块状凝灰质粉砂岩相、条带状含凝灰云岩相和纹层状粉砂质沉凝灰岩相为最有利岩相类型。

关键词: 细粒混合沉积岩, 岩相划分, 储集特征, 芦草沟组, 吉木萨尔凹陷

Abstract: In this study, lithofacies types and characteristics were analyzed in detail through examination of the tight finegrained sedimentary rocks of Permian Lucaogou Formation in the Jimsar Sag, Junggar Basin by methods of core observation, thin section identification, SEM (scanning electron microscope) and physical property testing. The results show that: (1) The tight finegrained sedimentary rocks have a complex mineral composition of multiple components including terrigenous detrital, pyroclastic debris and carbonate components, representing a type of transitional diamicton. (2) Based on factors such as component, sedimentary structure and organic carbon, the mixed sedimentary rock lithofacies can be divided into two types, namely the unicomponent lithofacies and multicomponents mixed lithofacies. The former is mainly massive lithofacies and the later consists of massive, strippedlumpy and laminated lithofacies. (3) There are six major lithofacies types that can be identified in the Lucaogou Formation: massive micritic dolostone, massive silty dolarenite, massive tuffaceous siltstone, stripped tuffaceous dolostone, laminated silty/argillaceous tuffites and laminated dolomitic mudstone. Different lithofacies types have different reservoir qualities, porethroat structures and reservoir spaces. And the massive tuffaceous siltstone, stripped tuffaceous dolostone and laminated silty tuffites are the favorable lithofacies.

Key words: mixed finegrained sedimentary rock, lithofacies division, reservoir characteristic, Lucaogou Formation, Jimsar Sag

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