Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (6): 154-163.doi: 10.12108/yxyqc.20200615

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Reservoir architecture and remaining oil distribution of channel-bar: a case from lower Minghuazhen Formation in Bohai A oilfield

DENG Meng1, SHAO Yingbo2, ZHAO Junshou1, LIAO Hui1, DENG Qi1   

  1. 1. Bohai Petroleum Research Institute, Tianjin Branch of CNOOC Ltd, Tianjin 300459, China;
    2. China-France Bohai Geoservice Co., Ltd., Tianjin 300450, China
  • Received:2019-09-13 Revised:2020-03-04 Online:2020-12-01 Published:2020-10-30

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Abstract: The lower Minghuazhen Formation of Neogen in Bohai A oilfield is bird-foot shallow water delta deposition. Due to the frequent erosion and superimposition of channel-bar in different periods on the plane,its spatial structure pattern was extremely complex,which greatly restricted the development effect of the oilfield. Under the guidance of sedimentary theory,based on the data of core,well logging and production performance,the fine reservoir configuration was carried out by using the method of reservoir configuration factor analysis. Meanwhile the spatial structure pattern of single sand body configuration units were defined,the control of remaining oil distribution by different single sand body configuration was discussed,and four types of remaining oil distribution models were established. The results show that the single sand body configuration units in the study area mainly develop three vertical contact patterns(such as separation type,superposition type and cutting superposition type)and three lateral splicing patterns(such as separation type,splicing type and side cutting type). In addition,the controls of single sand body configuration on the distribution of remaining oil were analyzed. It is considered that the rhythm within the single sand body,contact model of channel-bar sand body and plane heterogeneity are the main control factors of the distribution of remaining oil. The study area mainly develops "top enrichment", "vertical seepage blocking type", "plugging" and "under injection type" remaining oil distribution models, and the responding remaining oil potential can be exploited by sidetracking horizontal wells,injecting in thick layers while producing in thin layers,infilling wells and well pattern optimization respectively. The research results have guiding significance for the exploration of remaining oil potential in the middle-high water cut stages of the old offshore oilfields.

Key words: channel-bar composite sand body, reservoir architecture, contact patterns, remaining oil, Bohai A oilfield

CLC Number: 

  • TE122.2
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