Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (5): 110-120.doi: 10.12108/yxyqc.20220509

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Internal sedimentary structure and stacking patterns of deep-water lobe complex:A case study of Miocene zone D in Akpo oilfield, Niger Delta Basin

DUAN Ruikai, ZHANG Xu, GUO Fuxin, CHEN Guoning, HU Guangyi, ZOU Jingyun   

  1. CNOOC Research Institute Co., Ltd., Beijing 100028, China
  • Received:2021-10-08 Revised:2021-12-20 Online:2022-09-01 Published:2022-09-06

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Abstract: Based on the core,well logging and seismic data of Miocene zone D in Akpo oilfield,Niger Delta Basin, the composition of sedimentary units,sedimentary microfacies,sedimentary evolution and reservoir stacking patterns were studied,and the internal sedimentary structure of deep-water lobe complex was revealed. The results show that:(1)The deep-water lobe complex of Miocene zone D in Akpo oilfield is composed of four stages of single lobe and three branch channels,and the sedimentary evolution of deep-water lobe complex is controlled by interaction between single lobe and branch channels. The trend of branch channels controls the plane distribution of single lobe, and the growth of single lobe affects the lateral migration of branch channels.(2)The sedimentary microfacies of deep-water lobe complex in the study area could be divided into five types:lobed axis,lobed margin,sedimentary channel,erosive channel and semi-pelagic mud.(3)Considering spatial arrangement of microfacies units,the internal sedimentary structure of deep-water lobe complex could be divided into four stacking patterns,including lobe margin with lobe margin,lobe axis with lobe axis,upper lobe axis with lower lobe margin and upper lobe margin with lower lobe axis,and different reservoir stacking pattern has different reservoir quality and connectivity. Branch channel erodes and transforms the underlying lobe,and then affects the lateral reservoir connectivity which is determined by the filling property of branch channel. The research results have guiding significance for the optimization of production system and well deployment in Akpo oilfield,and have achieved good application results.

Key words: deep-water lobe complex, single lobe, branch channel, sedimentary structure, stacking pattern, Miocene zone D, Akpo oilfield, Niger Delta Basin

CLC Number: 

  • TE121.3
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