天然气地球科学

• 天然气地质学 • 上一篇    下一篇

准噶尔盆地阜康凹陷芦草沟组高有机碳页岩发育的古环境

石军,邹艳荣,余江,刘家靖   

  1. 1.中国科学院广州地球化学研究所有机地球化学国家重点实验室,广东 广州 510640;
    2.中国科学院大学,北京 100049;
    3.兰州大学地质科学与矿产资源学院,甘肃 兰州 730000
  • 收稿日期:2018-02-12 修回日期:2018-06-28 出版日期:2018-08-10 发布日期:2018-08-10
  • 通讯作者: 邹艳荣( 1959-),男,黑龙江双鸭山人,研究员,博士,博士生导师,主要从事油气地球化学研究. E-mail:zouyr@gig.ac.cn
  • 作者简介:石军(1995-),男,新疆鄯善人,硕士研究生,主要从事油气地球化学研究.E-mail:shijun@gig.ac.cn.
  • 基金资助:

    中国科学院大学生创新实践训练计划(编号:201716500061);国家自然科学基金创新研究群体项目(编号:41621062)联合资助.

Paleoenvironment of organic-rich shale from the Lucaogou Fromationin the Fukang Sag,Junggar Basin,China

Shi Jun,Zou Yan-rong,Yu Jiang,Liu Jia-jing
 
  

  1. 1.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;2.University of Chinese Academy of Sciences,Beijing 100049,China;
    3.School of Earth Sciences,Lanzhou University,Lanzhou 730000,China
  • Received:2018-02-12 Revised:2018-06-28 Online:2018-08-10 Published:2018-08-10

摘要:

准噶尔盆地是我国重要的大型含油气盆地,阜康凹陷位于准噶尔盆地东南缘,博格达山北麓,属于准噶尔盆地东部的次级凹陷。选取准噶尔盆地阜康凹陷四工河附近二叠系芦草沟组作为目标层位,探讨其有机质富集情况及古环境特征。总有机碳(TOC)分析表明,剖面上整体有机质含量介于3.67%~16.0%之间,平均值为8.50%,总体有机质含量高。微量元素在地质历史变迁过程中,物理化学条件在一定的平衡之后稳定存在,其相对含量大小的背后蕴含着古沉积环境信息。研究区的古环境,包括古盐度、古气候、古氧化还原条件、古水深、古生产力特征,经主微量元素含量及比值分析,结果显示为贫氧—次富氧、半干旱—温湿气候、水动力弱的淡水—半咸水陆相深湖湖盆沉积环境。高有机碳页岩主要是初始生产力较高造成的,古环境对有机质的富集具有积极的作用。
 

关键词: 阜康凹陷, 芦草沟组, 古环境, 淡水&mdash, 半咸水沉积

Abstract:

The Junggar Basin is a large oil-gas-bearingbasin in China,the Fukang Sag is located in the edge of the southeast of the Junggar Basin and on the north of the Bogda Mountain,which is the secondary sag in the east of the basin.We choose the Lucaogou Formation as the object that is near the Sigonghe River in the Fukang Sag to reveal the level of enrichment of the organic matter and sedimentary environment characteristics in study area.The content of organic matter in vertical profile ranged from 3.67% to 16.0% with an average of 8.5%,showing that the shale is rich in organic matter.Trace element plays a key role in unlocking paleoenvironments because of its stability.We explore the paleoenvironment through investigating paleosality,aleoclimate,paleoredox,paleoproductivity,paleo-water-depth,and paleoproductivity.Results suggest that the shale was deposited in the anoxic-suboxic,semi-arid and warm-humid,weak hydrodynamic,and fresh and semi-saline continental deep lake.High TOC in the shale is mainly caused by the primary productivity,and the paleoenvironment has a positive influence on the accumulation of organic carbon.

Key words: Shale, Fukang Sag, Lucaogou Formation, Paleoenvironment, Fresh and Semi-saline sedimentary

中图分类号: 

  • TE121.3

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