新疆石油地质 ›› 2007, Vol. 28 ›› Issue (2): 158-162.

• 油气勘探 • 上一篇    下一篇

柴达木盆地碱石山地区中新世介形类及其古环境

吉利明1, 姜桂凤2, 祝幼华3   

  1. 1.中国科学院 地质与地球物理研究所 兰州油气资源研究中心 气体地球化学重点实验室, 兰州 730000;
    2.中国石油 青海油田分公司 勘探开发研究院, 甘肃 敦煌 736202;
    3.中国科学院 南京地质古生物研究所, 南京 210008
  • 收稿日期:2006-08-31 出版日期:2007-04-01 发布日期:2020-07-31
  • 作者简介:吉利明(1963-), 男, 陕西咸阳人, 博士, 石油地质,(Tel) 0931-4960855(E-mail) jilimin@lzb.ac.cn.
  • 基金资助:
    中国科学院科技支青工程项目, 构造岩性油气藏预测技术及其在柴西南地区的应用(2006-06)资助

The Miocene Ostracoda and Paleoenvironment in Jianshishan Area of Qaidam Basin

JI Li-ming1, JIANG Gui-feng2, ZHU You-hua3   

  1. 1. Key Laboratouy of Gas Geochemistry, Lanzhou Research Center for Oil and Gas Resources, Institute of Geology and Geophysics, CAS, Lanzhou, Gansu 730000, China;
    2. Research Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang, Gansu 736202, China;
    3. Nanjing Institute of Geology and Paleontology, CAS, Nanjing, Jiangsu 210008, China
  • Received:2006-08-31 Online:2007-04-01 Published:2020-07-31

摘要: 柴达木盆地中部碱石山地区碱石1井岩屑及岩心的微体古生物分析,在上油砂山组和下油砂山组发现少量的介形类化石,其中以Eucyprisobtus较为丰富,出现的其他分子还有Eucyprisstenoformi、Cyprideis和Cyprinotus(Heterocypris)等。据化石时代分布认为,碱石1井含介形地层的时代为新近纪中新世,以Cyprideis的大量出现作为下油砂山组的顶界。据介形类生态分布认为,上油砂山组和下油砂山组的沉积环境属少盐水-真盐水湖泊,并且上油砂山组比下油砂山组的沉积环境更为咸化。碱石山地区中新世至上新世,湖泊在向东迁移过程中经历了浅→深→浅的演化过程,沉积水体逐渐咸化。

关键词: 柴达木盆地, 古地理环境, 介形虫, 中新世, 地层划分

Abstract: Based on analysis of micropaleontology on the cuttings and core samples from Jianshi Well 1 in Jianshishan area of middle Qaidam basin, a few ostracoda fossils dominated by Eucypris obtus and some others like Eucypris stenoformi, Cyprideis and Cyprinotus (Heterocypris) have been found in the Upper and Lower Youshashan formations. The era distribution of these fossils indicates that the strata with ostracoda in this well belongs to Miocene, abundant Cyprideis-bearing strata should be the top boundary of Lower Youshashan formation. The ecological distribution of the ostracoda shows that the sedimentary environment of Upper Youshashan formation and Lower Youshashan formation belongs to seldom-real brine lake, and the former is more salty than the latter. From Miocene to Pliocene, the lake was transported eastward and underwent the evolution from shallow to deep, then to shallow with brine being gradually salty in this area.

Key words: Qaidam basin, paleogeographic environment, ostracoda, Miocene, stratigraphic division

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