Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (4): 143-154.doi: 10.12108/yxyqc.20200415

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Influence of estuary bar structure on reservoir exploitation of upper Sha-1 submember in Dawangzhuang area,Raoyang Sag

LYU Wenrui1,2, ZHANG Feng3, JI Youliang1,2, ZHOU Yong1,2, LUO Nina1,2, ZHANG Yilou1,2, LIANG Xingru4, CHENG Yuzong5   

  1. 1. College of Geoscience, China University of Petroleum(Beijing), Beijing 102249, China;
    2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    3. Department of Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
    4. Research Institute of Exploration and Development, PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
    5. No.3 Oil Production Plant, PetroChina Huabei Oilfield Company, Hejian 062450, Heibei, China
  • Received:2019-07-10 Revised:2019-08-05 Online:2020-08-01 Published:2020-06-16

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Abstract: Underwater distributary channels and estuary bar sandbodies were developed in the third and fourth oil members of the upper Sha 1 member(Es1)in Dawangzhuang area of Raoyang Sag,and their internal structure influences the development of reservoirs. However, there is a lack of systematic research on the internal structure of estuary bar and the distribution of interbeds in this area. Based on the identification and analysis of sedimentary microfacies,the structural characteristics and reservoir characteristics of estuary bars and muddy interbeds were dissected by using core data,logging and production data. The influence of the internal structure of estuary bars on reservoir development was clarified and the reservoir model was established. The results show that in the third and fourth oil groups of upper Es1 in Dawangzhuang area,delta front subfacies was developed,including three microfacies:underwater distributary channel,estuary bar and underwater distributary bay. Muddy interbeds were developed between and within estuary bars. Along the source direction,estuary bar was S-shaped superimposed pre-accumulation,while in the vertical source direction,the multi-stage estuary bar was stacked vertically. The muddy barriers were developed between the estuary bars,and muddy interbeds were developed within the single estuary bar. There are three types of reservoirs developed in the study area:fault-controlled reservoir, lithology-controlled reservoir and fault-lithology composite reservoir. The muddy barriers between estuary bars in different stages are the reason for the inconsistency of oil-water interface, while the muddy interbeds within estuary bars are thin and the scale is small, which does not affect the connectivity.

Key words: estuary bar, muddy interbed, internal structure, reservoir exploitation, upper Es1, Raoyang Sag

CLC Number: 

  • TE122.2
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