Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (3): 85-94.doi: 10.12108/yxyqc.20210308

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sedimentary characteristics and main controlling factors of Paleogene beach bar in southwestern Bohai Bay Basin

ZHANG Wen, LYU Shicong, ZHAO Dalin, JIA Haisong, CAI Yueqian   

  1. Bohai Petroleum Research Institute of Tianjin Branch of CNOOC Limited, Tianjin 300459, China
  • Received:2020-05-18 Revised:2020-08-05 Published:2021-06-03

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Abstract: In order to study the sedimentary characteristics and main controlling factors of Paleogene Dongying Formation and Shahejie Formation in southwestern Bohai Bay Basin，core observation，thin section identification，well logging analysis and mercury injection test were carried out，and combined with the characteristics of paleogeomorphology，sedimentary models of beach bar and their differences were comprehensively analyzed. The results show that： （1）There are four types of beach bar，including sandy beach bar，gravel beach bar， mixed beach bar and carbonate beach bar.（2）The source supply intensity，paleogeomorphology，paleowater depth and paleowind wave jointly control the type and sedimentary characteristics of beach bar. The source supply intensity is the material basis and controls the type of beach bar sand body. The paleogeomorphology and paleowater depth control the thickness and distribution position of beach bar sand body，and paleowind wave affects the distribution form of beach bar sand body.（3）Sandy beach bar，mixed beach bar and carbonate beach bar have good physical properties and high test productivity，which are favorable targets for oil and gas exploration in the study area. The research results can provide reference for oil and gas exploration of beach bar reservoir.

Key words: source supply, paleogeomorphology, paleowater depth, paleowind wave, beach bar, Paleogene, Bohai Bay Basin

CLC Number: 

  • TE122.1
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