西南石油大学学报(自然科学版)

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A Study on Intercalation of Sand-gravel Braided River Deposit Based on Outcrop Section

Yin Senlin1,2, Wu Shenghe1, Chen Gongyang2, Bai Kai2, Zeng Jianhong3   

  1. 1. College of Geosciences,China University of Petroleum(Beijing),Changping,Beijing 102249,China
    2. College of Computer Science,Yangtze University,Jingzhou,Hubei 434023,China
    3. Exploration & Development Research Institute,Dagang Oilfield Company,PetroChina,Dagang,Tianjin 300280,China
  • Online:2014-08-01 Published:2014-08-01

Abstract:

Based on Triassic Karamay Formation outcrop of 35 profiles in Heiyoushan,which is located in the Zaire Mountain, northwestern of Junggar Basin. The lithofacies associations,architecture boundaries and hierarchy of architecture units are discussed by using lithofacies associations and hierarchy interface analysis methods,combined with sedimentary theory. Then, the origin,hierarchy,morphology as well as scale of intercalation in the sand-gravel braided river are analyzed. The results show that eight typical lithofacies which can be divided into eight fifth hierarchy architecture units and two third hierarchy architecture units are recognized. While the muddy intercalation is mainly divided into fine type and mud boulder type. Different level architecture units were identified in the fine grained type deposits. The mud boulder type intercalation chiefly develops in the bottom of channel,formed by the rapid sediment of mud which was caused by the erosion of bank and river bottom. It principally distributes on fifth or third hierarchy surface,pinching out toward both sides of channel. At the same time,internal intercalation of the different hierarchy controlled reservoir heterogeneity.

Key words: sand-gravel braided river, outcrop, intercalation, Karamay Formation, northwestern margin of Junggar Basin