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古地理学报 ›› 2003, Vol. 5 ›› Issue (1): 36-43. doi: 10.7605/gdlxb.2003.01.004

• 岩相古地理学及沉积学 • 上一篇    下一篇

内蒙古银根盆地下白垩统沉积相

吴少波   白玉宝   杨友运    

  1. 1西北大学地质学系 
    2西安石油学院资源与环境工程系
  • 出版日期:2003-02-01 发布日期:2003-02-01
  • 作者简介:吴少波（1965—），副教授，在读博士，主要从事沉积储层及石油地质的教学及研究工作。
  • 基金资助:

    石油天然气总公司新区勘探项目“银根—额济纳旗盆地群周缘露头区石油地质综合研究”部分成果。

SEDIMENTARY FACIES OF LOWER CRETACEOUS OF YINGEN BASIN IN INNER MONGOLIA

Wu Shaobo  Bai Yubao   Yang Youyun    

  1. 1Department of Geology, Northwest University
    2Department of Resources and Environment Engineering, Xi'an Petroleum Institute
  • Online:2003-02-01 Published:2003-02-01
  • About author:Wu Shaobo，born in 1965，graduated from Lanzhou Institute of geology， Chinese Academy of Sciences in 1989. Now he is an associate professor of Xi'an Petroleum Institute and is a candidate for the Doctor degree in the Department of Geology, Northwest University. His research interests include sedimentology, reservoir geology and petroleum geology.

摘要：

在对盆地周缘大量野外地质剖面详细测量的基础上结合室内分析，研究了银根盆地下白垩统巴音戈壁组的沉积相类型及其分布、演化。银根盆地下白垩统为典型的内陆湖盆沉积，形成了厚度达2000m以上的砂砾岩、泥岩夹碳酸盐岩、中基性火山岩，局部见油页岩和蒸发岩沉积，发育冲积扇、河流（以辫状河为主）、扇三角洲、三角洲、湖泊等沉积相类型。沉积体系的分布及演化主要受区域构造的影响，大致可以划分为三个沉积阶段，反映了断陷湖盆由发生、发展直至萎缩的一个完整旋回。早白垩世早期为湖盆初始断陷阶段，中期为强裂断陷阶段，晚期为湖盆萎缩阶段，每一沉积阶段在湖盆的不同部位发育了特定的沉积相类型及组合。

Abstract:

This paper analyzes the types of sedimentary facies of Lower Cretaceous Series and their distribution and evolution in Yingen Basin according to detailed survey and analysis of a lot of field geological sections around the basin. The Lower Cretaceous series of Yingen Basin are typical interior lacustrine basin deposits, which developed over 2000 meters of sandstone, conglomerate, mudstone, carbonate rocks, neutral to basic volcanic rocks and a little oil shale and evaporite. The types of sedimentary facies include alluvial fan, stream (mainly braided stream), fan-delta, delta and lacustrine facies. Regional structural movements mainly controlled the sedimentary systems and their distribution and evolution. The sedimentary facies evolution can be approximately divided into three stages that reflect a full sedimentary cycle of a faulted basin from formation, development to shrinkage. The early phase of Early Cretaceous Period was initial fault depression stage of the basin; the middle phase of Early Cretaceous Period was intense fault depression stage and the late phase of Early Cretaceous Period was fault depression shrinkage stage. Each stage developed special sedimentary facies and facies assemblage.