Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (1): 31-40.doi: 10.13278/j.cnki.jjuese.20180275

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Sedimentary Mechanism, Evolution and Distribution of Terminal Fan to Beach-Bar in Shore-Shallow Lake Sediments: A Case Study of 4th Member of Shahejie Formation in Weicheng Oildfield, Dongpu Depression

Li Weilu1, Gao Siyu1, Zhang Yi2, Zhang Jinliang3, Han Chunhua1   

  1. 1. National Marine Data and Information Service, Tianjin 300171, China;
    2. Geological Exploration Technology Institute of Jiangsu Province, Nanjing 210049, China;
    3. Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
  • Received:2018-10-27 Published:2020-02-11
  • Supported by:
    Supported by National Natural Science Foundation of China (41172109) and Natural Science Foundation of Shandong Province (ZR2011DM009)

Abstract: The accurate description to sedimentary facies and its evolution of the complicated depositional environment can effectively guide the oil and gas field exploration and exploitation. Combined with the regional background of Weicheng structure in Dongpu depression, the depositional features and sedimentary model of the 4th member of Shahejie Formation (Es4) in Wei 81 block of Weicheng oildfield were analyzed by use of the data of core description, logging, analysis and test, etc. It is considered that the associated sediments of terminal fan to beach-bar in shore-shallow lake are developed in the study formation of this block. The terminal fan was developed in the background of energy loss and flow fluctuation at the end of the rivers in the lower part of Es4, and the distributary channel evolved into overflow or mudflat along the source direction,thus forming the fan-shape accumulation; with the change of sedimentary environment under the frequent expansion or shrink of the lake level, the beach-bar sediments in shore-shallow were developed in Es4, paralleling to the trend of master fault with composite form.

Key words: associated deposits of terminal fan to beach-bar, sedimentary model, depositional evolution, sand distribution, Weicheng oilfield, Dongpu depression

CLC Number: 

  • P59
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