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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

湖相细粒沉积岩三—四级层序地层划分方法与特征——以渤海湾盆地东营凹陷古近系沙四上亚段为例

吴靖，姜在兴，王欣   

  1. 1.中国石油化工股份有限公司石油勘探开发研究院，北京 100083；
    2.中国石化页岩油气勘探开发重点实验室，北京 100083；
    3.中国地质大学（北京）能源学院，北京 100083
  • 收稿日期:2017-08-11 修回日期:2018-01-12 出版日期:2018-02-10 发布日期:2018-02-10
  • 作者简介:吴靖（1988-），女，新疆塔城人，高级工程师，博士，主要从事细粒沉积学、层序地层学研究.E-mail：wujing6524982@163.com.
  • 基金资助:

    中国石化科技攻关项目（编号：P16043）；国家科技重大专项（编号：2017ZX05036004-001）联合资助.

Sequence stratigraphy characteristics of lacustrine fine-grained sedimentary rocks:A case study of the upper fourth member of Paleogene Shahejie Formation，Dongying Sag，Bohai Bay Basin

Wu Jing，Jiang Zai-xing，Wang Xin   

  1. 1.Research Institute of Petroleum Exploration and Production，Sinopec，Beijing 100083，China；
    2.Sinopec Key Laboratory of Shale Gas/Oil Exploration & Production，Beijing 100083，China；
    3.Faculty of Energy Resources，China University of Geosciences，Beijing 100083，China
  • Received:2017-08-11 Revised:2018-01-12 Online:2018-02-10 Published:2018-02-10

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摘要：

细粒沉积岩的层序地层问题，既是难点，也是目前层序地层学重要的发展趋势及研究重点之一。研究提出针对湖相细粒沉积的三—四级层序划分方法、地层构成及模式。划分方法包括垂向综合划分与横向对比分析。首先综合利用岩相及其组合、矿物成分及地球化学指标，确定细粒沉积层序中体系域的界面识别标志与方法；其次，通过与传统层序地层中的准层序组（四级层序）进行对比，提出细粒沉积中的四级层序划分方法与地层（岩相）叠加样式，在体系域内进行细化；最后，在细粒沉积点划分的基础上，与浅水区粗粒沉积层序进行横向对比分析，包括层序地层叠置、水体变化及界面特征，确定各级界面的准确性。依据上述方法，选取东营凹陷作为实例进行层序地层解剖，发现该区沙四上亚段发育一个完整的三级层序，包含低位体系域、湖侵体系域及高位体系域，其中湖侵体系域中识别出受海侵影响的湖平面被动上升与湖平面正常上升2种类型；并基于垂向划分与横向对比，建立了细粒沉积的层序地层模式；指出因该区特有的性质，层序地层的发育受气候影响更为深刻。

关键词: 细粒沉积岩, 层序地层, 准层序组, 层序模式, 东营凹陷, 沙四上亚段

Abstract:

The sequence stratigraphy of fine-grained sedimentary rocks (FGSR) is difficult topic but a development tendency.This paper puts forward the division method，formation constitutes and model of lacustrine FGSR.The division method includes two steps：Synthetically vertical division and horizontal comparison analysis.Firstly，based on lithofacies and its combination，mineral composition，and geochemical indicators，this paper determines the interface standard and method to divide systems tracts.Secondly，the division method of parasequence set and stratigraphic (lithofacies) pattern established a comparison with traditional sequence stratigraphy.At last，connecting-wells show that stratigraphic pattern，water body variation，and characteristics of interface of fine-grained sedimentary rocks are same with coarse sediments.Based on the above methods，typical well in Dongying Sag is chosen as a case to divide sequence stratigraphy of fine-grained sedimentary rocks.The results show that a whole third-order sequence was developed including lowstand system tract，lacustrine transgressive system tract (TST) and highstand system tract.There are two types in TST，lake surface passive rise and lake surface normal to rise.After vertical division and lateral comparison，sequence stratigraphy model is established.As the special nature of fine-grained sedimentary rocks，the development of sequence stratigraphy is affected by the climate more obviously.

Key words: Fine-grained sedimentary rocks, Sequence stratigraphy, Parasequence set, Sequence model, Dongying Sag, Upper fourth member of Shahejie Formation

中图分类号: 

  • TE121.3


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