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现代地质 ›› 2005, Vol. 19 ›› Issue (Suppl): 87-91.

• 石油地质 • 上一篇    下一篇

柴达木盆地北部沉积—构造演化研究

彭德华1,2,徐凤银2,袁文芳3,陈世悦3   

  1. 1中国科学院 广州地球化学研究所,广东 广州510640;
    2中国石油天然气集团公司 青海油田分公司,甘肃 敦煌736202;
    3石油大学 地球资源与信息学院,山东 东营257061
  • 收稿日期:2004-09-08 修回日期:2004-10-28 出版日期:2005-03-20 发布日期:2013-04-08
  • 作者简介:彭德华,男,高级工程师,博士研究生,1959年出生,石油地质学专业,主要从事石油勘探及研究工作。

STUDY ON SEDIMENTARY-TECTONIC EVOLUTION IN NORTHERN QAIDAM BASIN, QINGHAI PROVINCE

PENG De-hua1,2,XU Feng-yin2,YUAN Wen-fang3,CHEN Shi-yue3   

  1. 1Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong510640,China;
    2Qinghai Oilfield Company, PetroChina Company Limited,Dunhuang, Gansu736202,China;
    3University of Petroleum, Dongying, Shandong257061,China
  • Received:2004-09-08 Revised:2004-10-28 Online:2005-03-20 Published:2013-04-08

摘要:

柴达木盆地北部广泛发育侏罗系地层。根据露头的层序地层分析,大煤沟地区的侏罗系剖面可划分为6个层序。层序1和层序4由低水位体系域、湖侵体系域和高水位体系域构成,层序2、层序3和层序5由低水位体系域和湖侵体系域构成,而层序6仅由低水位体系域构成。沉积层序的发育受湖平面变化和持续活动的基底断裂所控制。沉积—构造演化研究结果表明柴达木侏罗纪盆地为断陷盆地,这种盆地格局决定了聚煤环境主要发育在柴达木北缘断裂以北地区和陵间—达霍断裂以南地区,而烃源岩则主要发育在这两条断层所夹持的中心沉降带。

关键词: 层序, 沉积-构造演化, 基底断裂, 侏罗纪, 柴达木盆地

Abstract:

Jurassic deposition was extensively developed in the northern Qaidam Basin. According to sequence stratigraphical analysis of outcrops, the Jurassic profile in the Dameigou area can be divided into 6 sequences. Sequences 1 and 4 consist of lowstand, water transgression and highstand systems tracts, and sequences 2, 3 and 5 consist of lowstand and transgression systems tracts. However, sequence 6 only consists of a lowstand systems tract. The development of depositional sequences is controlled by lake level changes and basement faulting, which continued to be active in the Jurassic. The result of sedimentarytectonic evolution research indicates that Qaidam Basin is fault subsidence. This kind of basin framework determined that the coalforming environment would occur in the north side of northern boundary fault of the Qaidam Basin and the south side of Lingjian fault, and the source rock would develop in the central subsidence belt between the two faults.

Key words: sequence, sedimentary-tectonic evolution, basement fault, Jurassic, Qaidam Basin

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