Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (3): 144-158.doi: 10.12108/yxyqc.20200314

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Architecture characterization of single distributary channel sand bodies restricted by architecture interface of Yan 8 member in Y116 well area，Yanwu Oilfield

TONG Qiang1, YU Jianguo2, TIAN Yunji2, HU Kelai2, YANG Hongmei3, CHENG Xuming4, ZHU Yushuang1   

  1. 1. State Key Laboratory of Continental Dynamics/Department of Geology, Northwest University, Xi'an 710069, China;
    2. No. 11 Oil Production Plant, PetroChina Changqing Oilfield Company, Xifeng 745000, Gansu, China;
    3. No.2 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingyang 745100, Gansu, China;
    4. No.1 Operation Area, Suligen South Operation Branch, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2019-06-12 Revised:2019-09-10 Online:2020-05-21 Published:2020-04-30

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Abstract: The fine description of architecture of the sand bodies in a single channel is restricted by the third and fourth order architecture interface,which makes the classification and recognition of the interlayers to be the premise of this study. Guided by the analytic hierarchy process,starting from the core calibration,combined with the comprehensive analysis of logging data,the partition standard of the interlayer in Y116 well area of Yanwu Oilfield was identified by using intersection chart,and the horizontal and vertical distribution characteristics of the interlayer were studied by tracking multiple wells from a single well. Under its constraints,three types of architecture characterization units were depicted,forming the spatial distribution model of the architecture characterization interlayer. The results show that in Yan 8 member of Yanwu Oilfield,three types of architecture interfaces were identified,namely,the architecture characterization interlayer between sand bodies of single channel in vertical direction,the architecture characterization interlayer between sand bodies of single channel in horizontal direction and the interlayer within sand bodies of single channel. Under the genesis of argillaceous,calcareous and physical properties,the sand bodies of compound distributary channel were divided into four stages of single channel sand bodies. Among them,the architecture characterization interlayers are mainly distributed in the middle of the river,the muddy interlayers are common in the edge of the river,and the calcareous interlayers are mostly distributed in the upper part of the river. The research on the vertical superposition pattern and the plane contact pattern of the architecture characterization elements shows that the vertical separation type and cutting superposition type are the main types,and the horizontal side cutting type and flood plain contact type are the main types,forming the independent distributary channel unit,separate fine-grained sedimentary unit and contact accretion unit. All the architecture elements form an "extensive contact,superimposed and intricate" architecture distribution model of braided river delta plain with wide connectivity. This study realized the identification and characterization of interfaces in the study area,which can provide a basis for the fine characterization of single channel sand body architecture characterization unit,and has theoretical and practical significance for the further production and development of oilfield.

Key words: architecture characterization in single channel sand body, fine characterization, architecture interface, distribution pattern, Yan 8 member, Yanwu Oilfield

CLC Number: 

  • TE121.3
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