Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (2): 1-11.doi: 10.12108/yxyqc.20250201

• PETROLEUM EXPLORATION • Previous Articles    

Sedimentary characteristics of shallow water delta in the Neogene lower member of Minghuazhen Formation, Kenli 6-1 Oilfield in Bohai Bay Basin

LIAO Xinwu, YANG Qinghong, LI Chao, GUO Cheng, ZHAO Dalin   

  1. Bohai Petroleum Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300452, China
  • Received:2024-09-02 Revised:2024-10-02 Published:2025-03-06

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Abstract: In recent years, large oil and gas fields with reserves of billions of tons have been discovered of Neogene in Bohai Bay Basin. A comprehensive study was conducted on the sedimentary characteristics and paleoen-vironment of the shallow water delta in the lower section of the Minghuazhen Formation of the Neogene in the Kenli 6-1 oilfield in the Bohai Bay Basin，utilizing geological，logging，and seismic data. The results show that： （1）The sedimentary period of Minghuazhen Formation in Kenli 6-1 Oilfield in Bohai Bay Basin was characterized by a temperate humid climate，gentle terrain，ancient terrain slope less than 1°，average water depth less than 6.5 m， and abundant supply of sediment from the northeast direction.（2）The reservoir lithology is mainly composed of lithic feldspar sandstone，followed by feldspar sandstone and feldspar lithic sandstone；the probability curve of grain size is mainly in a two-stage form，and various sedimentary structures reflecting strong hydrodynamics are developed；the logging curves are mainly bell shaped and box shaped, and low amplitude tile shaped progradation features can be seen on the seismic profile.（3）The V1 layer underwater distributary channel has a long extension distance and narrow width, and is distributed in northeast-southwest direction as a whole；the farthest extension distance can reach 20.10 km，and the average length is 10.06 km；the width of the underwater distributary channel sand body is between 64 m and 420 m，with an average width of 219.65 m；the average thickness of the underwater distributary channel sand body is about 9.42 m. Based on the comprehensive distribution of sedimentary microfacies，the shallow water sedimentary style of Minghuazhen Formation in Kenli 6-1 Oilfield in Bohai Bay Basin was summarized. The research results provide strong geological basis for new drilling in the later stage of the oilfield，and also provide comparative materials for the exploration and development of other shallow water delta sediments in the Bohai Bay Basin.

Key words: shallow water delta, subaqueous distributary channel, imbricated progradation, palaeoclimate, paleowater depths, paleo-provenance, lower member of Minghuazhen Formation, KL6-1 Oilfield, Bohai Bay Basin

CLC Number: 

  • TE121.3+1
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