Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (6): 1678-1688.doi: 10.13278/j.cnki.jjuese.20210012

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Sedimentary Characteristics and Model of Branch Mouth Bar: A Case Study of Branch Mouth Bar in Ganjiang Delta of Poyang Lake

Li Yan1, Jin Zhenkui2, Gao Baishui2, Shi Liang2, Li Guizi2   

  1. 1. CNOOC International Limited, Beijing 100028, China;
    2. College of Geoscience, China University of Petroleum, Beijing 102249, China
  • Received:2021-01-14 Online:2021-11-26 Published:2021-11-24
  • Supported by:
    Supported by the National Key Basic Research and Development Program ("973" Program) of China (2006CB202300)

Abstract: Many oilfields in China have entered the stage of high water cut, and the remaining oil production is becoming harder and harder. The division of compound channels and single channels cannot satisfy the demand of oil exploration. It is needed to identify the favorable sand bodies in distributary channels. Research on modern sediment is an effective means to understand the development characteristics of sand-bodies in distributary channels. Branch mouth bar is an important sand type in the distributary channel based on the study of Ganjiang delta in Poyang Lake, which is characterized by its development in the branch site of the distributary channel. According to the hydrodynamic conditions, sediments, and sedimentary structures, the branch mouth bar is divided into bar head, bar middle, and bar tail. From the bar head to the bar tail, the hydrodynamic energy weakens, the bedding size decreases, the single sand body becomes thinner, the sediments become finer, and the mud interlayers increase. Obstructed by the branch site, the velocity of flow decreases, and the sediment deposits to form branch mouth bars mainly stacking in countercurrent accretion. The branch mouth bar develops more beddings, interlayers, and heterogeneity than the waterway. Because of the blocking effect of interlayers, it is not easy to be watered out, so branch mouth bar is the favorable zone for remaining oil.

Key words: branch mouth bar, distributary channel, sedimentary model, countercurrent accretion, Ganjiang delta

CLC Number: 

  • P512.2
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