• RSS
  • E-mail Alert
  • 收藏主页

古地理学报 ›› 2017, Vol. 19 ›› Issue (6): 999-1012. doi: 10.7605/gdlxb.2017.06.077

• 岩相古地理学及沉积学 • 上一篇    下一篇

鄂尔多斯盆地北部侏罗系直罗组沉积特征与演化*

薛锐1, 2, 赵俊峰1, 闫占冬1, 杨瑶1, 赵旭东1, 赵中平3   

  1. 1 大陆动力学国家重点实验室/西北大学地质学系,陕西西安 710069;
    2 中国石油长庆油田公司第十二采油厂,甘肃合水 745400;
    3 西安珠峰油气科技有限公司,陕西西安 710016
  • 收稿日期:2017-02-06 出版日期:2017-12-01 发布日期:2017-12-04
  • 通讯作者: 赵俊峰,男,1975年生,博士,西北大学副教授、硕士生导师,主要从事盆地分析与沉积学研究。E-mail: zjf@nwu.edu.cn。
  • 作者简介:薛锐,男,1991年生,硕士研究生,从事沉积学与石油地质学研究。E-mail: xuerui@stumail.nwu.edu.cn。
  • 基金资助:
    国家自然科学基金重点项目(编号: 41330315)、中国地质调查局地质调查项目(编号: 12120114009201)、西北大学大陆动力学国家重点实验室科技部专项经费项目(编号: 201210122)联合资助

Sedimentary characteristics and evolution of the Jurassic Zhiluo Formation in northern Ordos Basin

Xue Rui1, 2, Zhao Junfeng1, Yan Zhandong1, Yang Yao1, Zhao Xudong1, Zhao Zhongping3   

  1. 1 State Key Laboratory of Continental Dynamics/Department of Geology,Northwest University,Xi’an 710069,Shaanxi;
    2 No.12 Oil Production Plant of PetroChina Changqing Oilfield Company,Heshui 745400,Gansu;
    3 Xi’an Everest Oil & Gas Technology Co.,Ltd., Xi’an 710016,Shaanxi
  • Received:2017-02-06 Online:2017-12-01 Published:2017-12-04
  • Contact: 　Zhao Junfeng,born in 1975,is an associate professor of Northwest University. He is mainly engaged in sedimentology and basin analysis. E-mail: zjf@nwu.edu.cn.
  • About author:Xue Rui,born in 1991,is a master degree candidate of Northwest University. He is mainly engaged in sedimentology and petroleum geology. E-mail: xuerui@stumail.nwu.edu.cn.
  • Supported by:
    Co-funded by the State Key Program of National Natural Science Foundation of China(No.41330315),the Geological Survey Project of China Geological Survey(No.12120114009201),and the Ministry of Science and Technology Special Fund Project of State Key Laboratory of Continental Dynamics,Northwest University(No.201210122)

RichHTML

PDF

摘要： 鄂尔多斯盆地东北部发现的多个砂岩型铀矿床均赋存于侏罗系直罗组下段砂岩中。前人对已知铀矿床分布区直罗组的沉积学研究程度相对较高,但对盆地北部直罗组大区域沉积体系展布与演变、物源供给特征等的研究仍较为薄弱。文中在大量钻井资料分析、野外剖面实测等基础上,将盆地北部砂岩型铀矿含矿层段直罗组下段细分为2个亚段。在直罗组中识别出河流和三角洲相沉积,认为直罗组下段下亚段主要发育砾质、砂质辫状河沉积,东北部地区发育辫状河三角洲沉积;直罗组下段上亚段主要发育砂质辫状河和曲流河沉积;直罗组上段则以曲流河沉积为主。结合前人研究工作,认为源岩物质组成、有利沉积相带和气候条件对鄂尔多斯盆地北部砂岩型铀矿的成矿均具有重要控制作用。对盆地北部直罗组沉积特征及其演化的整体认识,可为该区砂岩型铀矿床的进一步勘查提供重要的沉积学依据。

关键词: 沉积相, 侏罗系, 直罗组, 砂岩型铀矿, 鄂尔多斯盆地北部

Abstract: The sandstones in the Lower Member of the Jurassic Zhiluo Formation in northeastern Ordos Basin has been recognized as major reservoirs of uranium in northeastern Ordos Basin. Although previous studies on the sedimentology of the uranium-bearing sandstones in the basin have been usually focused on regional distribution of the uranium-bearing sandstones in northern Ordos Basin received very few attention. Based on large quantities of well data and outcrop measurements in this study, the Lower Member of Zhiluo Formation is divided into two sub-members (J2z1-1, J2z1-2) in northern Ordos Basin. The main types of sedimentary facies identified in the Zhiluo Formation include fluvial facies and deltaic facies. During the deposition of the lower sub-member, the main depositional facies developed include gravelly to sandy braided fluvial deposits and deltaic deposits in the northeastern part of the study area. The main depositional facies gradually changed to sandy braided and meandering fluvial deposits during the deposition of the upper sub-member. Meandering fluvial systems were widely developed during deposition of the upper member, especially toward the top of the member. This study found that the development of uranium ore is mainly controlled by factors such as material composition of the source rock, distribution and evolution of favorable depositional systems, and climate condition. The analysis of facies and the development of the depositional model of the Zhiluo Formation could potentially have important applications for the exploration of uranium deposits in northern Ordos Basin.

Key words: sedimentary facies, Jurassic, Zhiluo Formation, sandstone-hosted uranium deposits, northern Ordos Basin

中图分类号: