天然气地球科学

• 天然气地质学 • 上一篇    下一篇

准噶尔盆地南缘四工河剖面中二叠统乌拉泊组辫状河三角洲沉积模式及沉积序列

李亚龙,于兴河,单新,姚宗全,李顺利,孙乐,杨志浩,金丽娜   

  1. 中国地质大学(北京) 能源学院,北京 100083
  • 收稿日期:2017-06-09 修回日期:2017-09-26 出版日期:2017-11-10 发布日期:2017-11-10
  • 通讯作者: 于兴河(1958-),男,湖北襄阳人,教授,博士生导师,主要从事沉积学、储层表征建模及油气地质研究。 E-mail:billyu@cugb.edu.cn.
  • 作者简介:李亚龙(1992-),男,甘肃定西人,硕士研究生,主要从事储层沉积学研究.E-mail:1454446894@qq.com.
  • 基金资助:

    国家自然科学基金(编号:41472091);国家“十三五”科技重大专项(编号:2017ZX05001-002)联合资助.

The characteristics and model of the braided-river delta of the Wulabo Formation of the Sigonghe section in the southern Junggar Basin

Li Ya-long,Yu Xing-he,Shan Xin,Yao Zong-quan,Li Shun-li,Sun Le,Yang Zhi-hao,Jin Li-na
 
  

  1. School of Energy Resources,China University of Geosciences(Beijing),Beijing 10008, China
  • Received:2017-06-09 Revised:2017-09-26 Online:2017-11-10 Published:2017-11-10

摘要:

辫状河三角洲砂体较为发育,物性良好,可作为重要的油气储层。因此,深入分析其沉积特征、建立沉积模式及序列对油气勘探具有重要的指导作用。通过对准噶尔盆地南缘四工河剖面乌拉泊组辫状河三角洲露头进行实测,对各沉积微相沉积特征、岩相及粒度特征进行分析,最终建立该区辫状河三角洲沉积模式及垂向沉积序列。研究表明:四工河剖面沉积主要以辫状河三角洲平原和前缘亚相为主,微相主要为平原分流河道、分流河道间、水下分流河道及河口坝等,辫状河三角洲前缘砂质较为发育,以水下分流河道砂体为主,粒度较细,分选、磨圆均较好,可作为油气良好的储层;岩相识别、划分表明,乌拉泊组辫状河三角洲共发育8种典型的岩相类型,识别出4种典型的岩相及微相组合;辫状河分流河道粒度曲线主要由跳跃总体与悬浮总体组成,且水下分流河道跳跃总体可分为2段,河口坝粒度曲线由多段组成,较为复杂;在对沉积特征、岩相、粒度等研究的基础上,最终建立乌拉泊组辫状河三角洲沉积模式,可为区内油气勘探提供一定的指导。

关键词: 辫状河三角洲, 岩相类型, 粒度分析, 沉积序列, 沉积模式, 乌拉泊组, 准噶尔南缘

Abstract:

Braided delta is an important reservoir of oil and gas which is enriched in sand with good physical properties.Consequently,study of its sedimentary characteristics and sedimentary sequence has important guiding significance for the oil and gas exploration.In this study,sedimentary model and stratigraphy sequence for Wulabo Formation are established through outcrop measure,analysis of microfacies and sedimentary characteristics in southern margin of Junggar Basin.The results show that the main subfacies of Wulabo Formation is braided delta plain and front,the microfacies is delta plain distributary channel,subaqueous interdistributary channel,subaqueous distributary channel,mouth bar etc.The sandbody in braided delta front is significant reservoir for oil and gas since it has fine particle size,well sorting and rounding.Through lithofacies division,Wulabo Formation can be divided into 8 typical lithofacies and 4 typical lithofacies combination.The grain size probability cumulative of distributary channel is made up of saltation and suspension,moreover,the saltation of subaqueous distributary channel can be divided into two sections and the grain size probability cumulative of mouth bar is composed of multiple sections which is more complicated.Based on the study of sedimentary characteristics,lithofacies and grain size,the braided river delta depositional model of Wulabo Formation is established,which can provide guidance for oil and gas exploration in this area.
 

Key words: Braided-river delta, Types of lithofacies, Grain size analysis, Sedimentary sequence, Sedimentary model;Wulabo Formation, Southern Junggar Basin

中图分类号: 

  • TE121.3

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