Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (3): 93-103.doi: 10.12108/yxyqc.20220309

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sedimentary characteristics of braided-meandering transitional river of Neogene Guantao Formation in northeastern Liaodong Bay Depression

LI Xiaohui, DU Xiaofeng, GUAN Dayong, WANG Zhiping, WANG Qiming   

  1. Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2021-09-15 Revised:2021-10-18 Online:2022-05-01 Published:2022-05-12

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Abstract: Braided-meandering transitional river is a type of river developed in the process of braided river transforming to meandering river. Based on modern sedimentary analogy，tectonic evolution analysis，core analysis and seismic forward modeling analysis，the sedimentary system types and sedimentary evolution law of Neogene Guantao Formation in northeastern Liaodong Bay Depression of Bohai Bay Basin were studied. Under the control of sequence strata，the macro and micro sedimentary characteristics and reservoir accumulation conditions of three sedimentary systems of Guantao Formation，including braided river，meandering river and braided-meandering transitional river，were compared. The results show that： （1）During the sedimentary period of Guantao Formation in northeastern Liaodong Bay Depression，the sedimentary system gradually transited from braided river to meandering river，and braided-meandering transitional river developed in the middle Guantao Formation.（2）The braided-meandering transitional river are characterized by strong hydrodynamic force，combined vertical accretion and lateral accretion，moderate reservoir development and maturity，low-frequency interbedded sandstone and mudstone，and superposition of box-shaped and bell-shaped logging curves.（3）Compared with the reservoirs of braided river and meandering river，the braided-meandering transitional river reservoirs have better lateral connectivity，large-scale mudstone interlayers developed at vertical intervals，and better reservoir-cap assemblage conditions，which determines that they are more conducive to large-scale hydrocarbon accumulation.

Key words: braided-meandering transitional river, braided river, meandering river, sedimentary characteristics, Guantao Formation, Neogene, Liaodong Bay Depression

CLC Number: 

  • TE121
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