新疆石油地质

新疆石油地质 ›› 2004, Vol. 25 ›› Issue (1): 13-16.

• 油气勘探 • 上一篇    下一篇

青藏羌塘三叠纪盆地的形成与演化

郑孟林1,2, 刘池阳3, 王定3   

  1. 1.石油大学盆地与油藏研究中心,北京102249;
    2.石油大学石油天然气成藏机理教育部重点实验室,北京102249;
    3.西北大学地质学系,陕西西安710069
  • 收稿日期:2003-03-06 出版日期:2004-02-01 发布日期:2020-08-06
  • 作者简介:郑孟林1968-), 男,河北博野人,高级工程师,博士,石油地质。联系电话:010-89715860

Formation and Evolution of Triassic Qiangtang Basin in Qinghai-Tibet Plateau

ZHENG Meng-lin1,2, LIU Chi-yang3, WANG Ding-yi3   

  1. 1. Research Center of Basin and Reservoir, Univensity of Petroleum, Beijing 102249, China;
    2. Key Laboratory of Hydrocarbon Accumulation Mechanism, Ministry of Education, University of Petroleum, Beijing 102249, China;
    3. Department of Geology, Northwest University, Xi an, Shaanxi 710069,China
  • Received:2003-03-06 Online:2004-02-01 Published:2020-08-06

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摘要： 羌塘三叠纪盆地的形成演化受拉竹龙-西金乌兰陆间裂谷和班公湖-丁青裂谷演化的控制，早中三叠世为三叠 纪盆地初始形成阶段,沉积范围局限于今盆地西北部。晚三叠世早期,拉竹龙-西金乌兰陆间裂谷扩张,班公湖-丁青裂 谷初始形成，盆地断陷沉降,发育三种类型的建造:碎屑岩建造,碳酸盐岩建造和中基性火山岩建造。晚三叠世中期,盆 地处于构造相对稳定阶段,全区被海水淹没,沉积了一套厚度相对变化不大的海相碳酸盐岩。晚三叠世晚期，由于拉竹 龙-西金乌兰陆间裂谷的闭合,盆地发生大规模海退,形成了一套砂泥岩夹煤层或煤线为主体的沉积建造。

关键词: 羌塘盆地, 三叠纪, 形成, 演化

Abstract: The formation and evolution of Triassic Qiangtang basin are controlled by Lazhulong-Xjjinwulan rift and Bangonghu-Dingqing rift. In .early and middle Triassic, the basin is at the beginning of the formation and the deposition is limited in northwestern part of it. In the early peri- od of late Triassic, these two rifts initiated shaping and by the basin's faulting and subsiding, three formations are developed as clastic formation,carbonate formation and mediate-basic volcanic formation. During the middle period of late Triassic，the basin is in relative stable stage completely submerged by sea water. In the late period of late Triassic, Lzhulong-Xijinwulan rift is closed followed by large-scale marine regressing,hence the depos itional formation dominated by sand-shale intercalated with coal seam or "coal line" is shaped.

Key words: Qiangtang basin, Triassic, formation, evolution

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