地理科学 ›› 1984, Vol. 4 ›› Issue (3): 243-250.doi: 10.13249/j.cnki.sgs.1984.03.243

• 论文 • 上一篇    下一篇

定兴点坝沉积

顾家裕   

  1. 北京石油勘探开发研究院
  • 出版日期:1984-05-20 发布日期:1984-05-20

DEPOSITION OF THE DINGXING POINT BAR

Gu Jiayu   

  1. Beijing Scientific Research Institute for Petroleum Exploration and Development
  • Online:1984-05-20 Published:1984-05-20

摘要: 点坝(Point bar)是曲流河段十分明显而又重要的沉积体,它是河流侧向迁移过程中侧向加积和垂向加积共同作用的产物。古代点坝沉积是地下水和油气储集的良好场所,因此,对点坝的研究引起沉积学家、石油地质学家的浓厚兴趣,麦高恩(McGowen)和加纳(Garner)(1970)研究了路易斯安娜州阿米特河和德克萨斯州科罗拉多河曲流点坝中的沉积构造,科尔曼(Coleman)(1969)和雷(Ray)(1967从不同角度分别对孟加拉的布拉马普特拉河和密西西比河的点坝沉积进行了研究,特别是艾伦(Allen)(1964)提出的点坝垂向沉积层序模式得到广泛的重视。

Abstract: Through the investigation for eleven profiles in the Dingxing point bar, the vertically depositional sections can be divided into two types,one is dominated by the large trough cross-bedding,the another is dominated by opposite inclined bedding,and this paper also discusses the developing process of the former.According to the geomorphological location,texture and structures of the deposits,the point bar is divided into six sub-facies:channel lag deposits,small shoal,flute bars,flood fill deposits between two flute bars,chute deposits and mud bodies on the outside of fIute bar.Finally,the paper deals with the origin of the two kinds of interesting bedding-distorted stratification and opposite inclined bedding.