石油学报 ›› 2007, Vol. 28 ›› Issue (2): 40-43,48.DOI: 10.7623/syxb200206007

• 地质勘探 • 上一篇    下一篇

鄂尔多斯盆地三叠纪疑源类及其与油源岩发育的关系

吉利明1,2, 徐金鲤3   

  1. 1. 中国科学院地质地球物理研究所兰州油气资源研究中心, 甘肃兰州, 730000;
    2. 中国地质大学研究生院, 湖北武汉, 430074;
    3. 中国石化胜利油田地质科学研究院, 山东东营, 257015
  • 收稿日期:2006-03-27 修回日期:2006-06-09 出版日期:2007-03-25 发布日期:2010-05-21
  • 作者简介:吉利明,男,1963年1月生,2005年获中国地质大学地球化学博士学位;现为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副研究员,主要从事微体古生物学与油气地球化学研究工作.E-mail:liming_ji@163.com
  • 基金资助:
    中国科学院"西部之光"人才培养计划项目与甘肃省中青年科技基金项目(AC2002-404-01)联合资助.

Triassic acritarchs and its relation to hydrocarbon source rock in Ordos Basin

Ji Liming1,2, Xu Jinli3   

  1. 1. Lanzhou Research Center of Oil and Gas in the Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. Graduate School, China University of Geosciences, Wuhan 430074, China;
    3. Geological Sciences Institute, Sinopec Shengli Oilfield Company, Dongying 257015, China
  • Received:2006-03-27 Revised:2006-06-09 Online:2007-03-25 Published:2010-05-21

摘要: 对鄂尔多斯盆地西南部陇东地区中上三叠统微体古生物进行了分析,在延长组长7段发现极其丰富的以光面球藻为主的疑源类组合。与古生代以前光面球藻来源于海生单细胞浮游藻类不同,延长组光面藻可能来源于湖相淡水宏观藻类,这些化石可能是大型红藻或绿藻类的孢子体。疑源类分布的高丰度层位长73—长72段恰好是本地区的主要油源岩层。疑源类不仅是源岩中藻类体和无定形体的主要组成部分,而且热解指数也显示出,随疑源类丰度的升高,源岩生烃能力逐渐增强。这些特征均表明疑源类是鄂尔多斯盆地三叠系延长组湖相优质烃源岩形成的重要母质。

关键词: 鄂尔多斯盆地, 西峰油田, 三叠系, 延长组, 疑源类, 烃源岩

Abstract: The microfossil analysis of the samples from the Middle and Upper Triassic in eastern Gansu Province was made. The extremely abundant acritarchs assemblage mainly consisting of Leiosphaeridia was discovered in Chang 7 Member of Yanchang Formation in southwestern Ordos Basin. Leiosphaeridia discovered from the Yanchang Formation might root in the lacustrine macroscopic algae, which may be the sporophyte of large-scale red algae and/or chlorophytes. Whereas the Proterozoic and Paleozoic Leiosphaeridia is commonly thought as the marine unicellular phytoplankton. The strata of high abundance acritarchs accorded with the distribution of the main source rock in Chang 7-3 and Chang 7-2 members of Yanchang Formation in eastern Gansu Province. The acritarchs is the important component of alginite and amorphous mass. The pyrolytic indexes show that hydrocarbon potential gradually boosts up with the increase of acritarchs abundance. The lacustrine acritarch is the important biologic source of high-quality source rock of the Yanchang Formation in Ordos Basin.

Key words: Ordos Basin, Xifeng Oilfield, Triassic, Yanchang Formation, acritarchs, hydrocarbon source rock

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