Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 16-23.doi: 10.12108/yxyqc.20190203

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Sandbody structure and its genesis of shallow-water delta of Chang 81 reservoir in Jiyuan area,Ordos Basin

LIU Guizhen1, GAO Wei2, ZHANG Dandan3, CHEN Long4, LI Airong1   

  1. 1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Research Institute of Oil & Gas Technology, PetroChina Changqing Oilfield Company, Xi'an 710021, China;
    3. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China;
    4. No.3 Oil Production Plant, PetroChina Changqing Oilfield Company, Yinchuan 750006, China
  • Received:2018-09-25 Revised:2018-12-13 Online:2019-03-21 Published:2019-03-21

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Abstract: Chang 8 oil reservoir set of Yanchang Formation in Ordos Basin belongs to shallow-water delta deposit, of which the reservoir changes rapidly and has strong heterogeneity. To identify the characteristics of reservoir heterogeneity and predict reservoir sweet spot in Jiyuan area,studies were performed on the structure characteristics,genesis and distribution of sandbodies of Chang 8 1 reservoir by using data from coring and well logging and modern sedimentary cases. The results show that there are four types of sandbody structure in this area,including composite funnel (block composite funnel and layered composite funnel),zigzag bell-shaped,isolated box and isolated finger sandbody structure. The former two types of sandbody structure are vmultiple superimposed by distributary channel and were the main oil-bearing sandbodies. The origin,type and distribution of sandbody structure are related to palaeotectonics,paleogeomorphology,base-level cycles,sediment supply and palaeoclimate. Based on the characteristics of modern shallow delta sedimentation in Poyang Lake delta,the sandbodies in the study area are multistage distributary channel deposition,which have the characteristics of superimposed reservoir vertically and sheet distribution in horizontal. This understanding will be helpful to oil and gas exploration and development of Yanchang Formation in Ordos Basin.

Key words: sandbody structure, shallow-water delta, Chang 81 reservoir, Jiyuan area, Ordos Basin

CLC Number: 

  • TE121.3
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