Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (1): 1-11.doi: 10.12108/yxyqc.20210101

• FORUM AND REVIEW •     Next Articles

Depositional features and growth pattern of large shallow-water deltas in depression basin

YUAN Xuanjun1,2, ZHOU Hongying1, ZHANG Zhijie1,2, WANG Ziye1, CHENG Dawei1, GUO Hao3, ZHANG Youyan1, DONG Wentong1   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. Key Laboratory of Oil and Gas Reservoir, CNPC, Beijing 100083, China;
    3. Research Center of Exploration and Development, PetroChina South Exploration & Production Company, Haikou 570100, China
  • Received:2020-10-10 Revised:2020-12-18 Online:2021-02-01 Published:2021-01-25

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Abstract: Large shallow-water deltas in depression basin contribute to the main potential increase of onshore lithologic reservoirs in China. The Baoqian delta of the Upper Cretaceous in southern Songliao Basin and the modern Ganjiang delta in Poyang Lake were analyzed. The particular focus was put on the paleo-environment, depositional features and growth pattern of this type of delta.(1)Depression basins are favorable for large shallow-water deltas. Unconfined morphology results in the frequent rise and fall of lake-level,which controls the delta dimension in dip direction.(2)There are two different types of deltas in the Upper Cretaceous of southern Songliao Basin. One is deep-water delta characterized by lobe shape and easily-identified depositional facies, mainly including distributary channels,mouth bars,and interdistributary bays. Another is shallow-water delta characterized by bird's foot shape and obscure boundaries between depositional facies,mainly including distributary channels and interdistributary bays,with mouth bar less developed.(3)The remote sensing for modern sedimentary systems reveals the evolution of Ganjiang middle delta in Poyang Lake in recent 50 years,showing the transition from disperse branch shape to connective network shape.(4)Large shallow-water delta in depression basins is a complex consisting of several deltas formed in multi-scenarios. The sand-bodies of distributary channels are the most significant reservoir and carry massive lithologic reservoirs. They are distributed horizontally in a net pattern and control the distribution of lithologic reservoirs.

Key words: depression basin, shallow-water delta, depositional feature, growth pattern, lithologic reservoirs, Songliao Basin, Poyang Lake

CLC Number: 

  • TE121.3
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