中国石油勘探 ›› 2011, Vol. 16 ›› Issue (2): 30-34,86.

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羌塘盆地喜马拉雅期断裂活动对沉积序列的控制作用

张锦伟,魏春光   

  1. 中海油研究总院;中国石油勘探开发研究院
  • 出版日期:2011-04-15 发布日期:2011-04-15

Control of Himalayan Fracture Movement over Sedimentary Sequences in Qiangtang Basin

Zhang Jinwei and Wei Chunguang   

  1. Zhang Jinwei1,Wei Chunguang2 1.CNOOC Research Center,Beijing 100027;2.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083
  • Online:2011-04-15 Published:2011-04-15

摘要: 对羌塘盆地喜马拉雅期的幕式变形过程以及断裂活动过程如何控制沉积作用进行了讨论。在盆地沉积建造序列及其平面分布特征分析的基础上,认为羌塘地块在喜马拉雅期至少存在3幕变形过程。第一幕发生于中新世,地块内北西西—北东向共轭走滑断层发育,控制了康托组的形成与改造;第二幕发生于上新世早期,北西西—北东向共轭断层中的北西西向断层得到强化,控制了唢呐湖组地层的形成;第三幕发生于上新世末,南北向张性断裂开始产生,控制了石坪顶组火山岩及更新统的分布。并简单讨论了断裂活动对油气保存条件的影响。

关键词: 羌塘盆地, 喜马拉雅期, 断裂活动, 沉积建造, 构造演化

Abstract: This paper discusses how the Himalayan episodic deformation and fracture movement controls sedimentation in Qiangtang Basin. It is believed that the Qiangtang Block has at least three episode deformations in Himalayan Period, base on analyzing the sedimentary sequence and its horizontal distribution in the Basin. The first one occurred in Miocene; development of NWW-NE conjugated strike-slip faults controlled the formation and transformation of Kangtuo Formation. The second one occurred in early Pliocene; the NWWfaults in NWW-NE conjugated faults were strengthened, which controlled the formation of strata in Suonahu Formation. The third one occurred in the end of Pliocene; South-North tension fractures were produced, which controlled the distribution of volcanic rocks and Pleistocene in Shipingding Formation. This paper also briefly discusses the effect of fracture movement on the preservation conditions of oil and gas

Key words: Qiangtang Basin, Himalayan, fracture movement, sedimentary formation, tectonic evolution

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