Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (1): 1-13.doi: 10.12108/yxyqc.20220101

• PETROLEUM GEOLOGY •     Next Articles

Sedimentary characteristics and models of shallow water delta front subfacies reservoirs: A case study of Sapugao oil layer in north-Ⅱ block of Sabei oilfield, Daqing placanticline

LIU Zongbao1, LI Xue1, ZHENG Ronghua2, LIU Huaqing3, YANG Zhanlong3, CAO Song4   

  1. 1. College of Geoscience, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    2. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
    3. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China;
    4. No.5 Oil Production Plant, PetroChina Huabei Oilfield Company, Xinji 052360, Hebei, China
  • Received:2021-07-25 Revised:2021-10-18 Online:2022-01-01 Published:2022-01-21

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Abstract: Shallow water delta front subfacies reservoir is an important research field for reservoir increase and production stabilization in China's main oil fields. In order to further explore the distribution characteristics of reservoir sand bodies,the sedimentary microfacies of 65 units of Sapugao oil layer in north-Ⅱ block of Sabei oilfield,Daqing placanticline were studied by using dense well pattern data,the sedimentary models of shallow water delta front subfacies reservoirs were established under the conditions of sufficient and insufficient provenance supply respectively. The results show that:(1) The Sapugao oil layer develope large shallow water delta front subfacies,which are characterized by fine lithologies,interbedded sand and mud,discontinuous positive rhythm,incomplete vertical facies sequence,subaqueous distributary channel as framework and undeveloped mouth bar. (2) The subaqueous distributary channels can be divided into nearshore broad-band type,middle shore narrowband type and far shore broken branch type. The distributary angle gradually increases,the bifurcation angle first increases and then decreases,and the width to thickness ratio gradually decreases along the provenance direction. (3) The outer front subfacies are controlled by source supply and wave transformation. The sheet sands were divided into thick and stable type,thick and unstable type,thin and stable type,thin and unstable type. The distal sand bars were divided into thick and wide band type,thin and narrow band type.(4) The Sapugao oil layer experienced a sedimentary evolution sequence of high-frequency oscillation in the early stage,slow decline in the middle stage and rapid rise in the late stage.(5) When the source supply is sufficient,the subaqueous distributary channel extends far and has high density,and the sheet sand scale is large and the distal sand bar is developed. When the source supply is insufficient,the subaqueous distributary channel extends near and has low density,and the sheet sand scale is small and the distal sand bar is undeveloped. The research results have reference significance for guiding the exploration and development of similar lithologic reservoirs.

Key words: shallow water delta front, sedimentary characteristics, sedimentary model, Sapugao oil layer, Sabei oilfield, Songliao Basin

CLC Number: 

  • TE122.2
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