石油与天然气地质 ›› 1999, Vol. 20 ›› Issue (3): 252-254,259.doi: 10.11743/ogg19990317

• 油气空间 • 上一篇    下一篇

塔北草湖凹陷的油气勘探方向

傅强, 王家林, 周祖翼   

  1. 同济大学海洋地质与地球物理系 上海 200092
  • 收稿日期:1999-04-25 出版日期:1999-09-25 发布日期:2012-01-16
  • 基金项目:

    国家"九五"重点科技攻关项目

EXPLORING DIRECTION OF PETROLEUM IN CAOHU SAG, NORTHERN TARIM

Fu Qiang, Wang Jialing, Zhou Zuyi   

  1. Marine Geology and Geophysics Department, Tongji University, Shanghai
  • Received:1999-04-25 Online:1999-09-25 Published:2012-01-16

PDF (PC)

1043

被引次数

16

摘要：

草湖凹陷属塔北下古生界满加尔坳陷北延部分,主力生油岩为腐泥型的寒武-奥陶系碳酸盐岩。寒武系主生油期为加里东中期-海西晚期,奥陶系为海西期-燕山期。这两套生油岩曾生成并排出过大量油气,主运移期分别为晚古代晚期-早侏罗世和早中新世-第四纪,主要沿寒武-奥陶系由南向西、北、东侧向运移。凹陷北部及东部晚海西期强烈抬升,剥蚀作用长达40 Ma,不仅将二叠系剥蚀殆尽,而且已生成的油气沿断裂全部逸散,这是近年来十余口钻井全部落空的原因,但是在草湖凹陷与阿克库勒凸起之间的斜坡上的石炭系和三叠系圈闭形成早,后期破坏小,油气逸散少,成藏条件好,应是下一步勘探布井的有利场所。

关键词: 草湖凹陷, 含油气系统, 烃源岩, 油气运移, 勘探方向

Abstract:

Caohu Sag is located in the northern extensional part of Manjiar Depression,North Tarim.The main source rock is the Cambrian Ordovician carbonate rock,and the major period of oil generation in Cambrian was in Middle Caledonian Late Hercynian period;that of Ordovician was Hercynian Yenshan period.The source rock of the above mentioned periods used to generate and expel large amount of oil and gas.The oil and gas migrated respectively in Late Paleozoic Early Jurassic and Early Miocene Quaternary along Cambrian and Ordovician sediments to the west,north and east sides.The northern and eastern parts of the sag uplifted intensively during late Hercynian,the erosion lasted for 40 Ma.As a result,not only the Permian sediments there were eroded completely,but also the oil and gas that had generated before escaped along faults.That is why more than ten wells drilled there are all dry.As for the Carboniferous and Triassic traps formed on the slope between Caohu sag and Ackule uplift,they should be taken as targets of oil and gas exploration since they formed earlier,underwent small damage,oil and gas there have seldem escaped.

Key words: Caohu Sag, petroleum system, source rock, oil gas migration, exploring direction

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