Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (4): 37-49.doi: 10.12108/yxyqc.20230404

• PETROLEUM EXPLORATION • Previous Articles    

Configuration characterization of Triassic Chang 611reservoir in Sai 160 well area of Ansai oilfield，Ordos Basin

YIN Yanshu1, DING Wengang1, AN Xiaoping2, XU Zhenhua1   

  1. 1. School of Geosciences, Yangtze University, Wuhan 430100, China;
    2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2022-11-10 Revised:2022-12-15 Published:2023-07-01

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Abstract: Sai 160 well area in Ansai oilfield，Ordos Basin，is a shallow water delta deposit，the sand bodies are dominated by channel deposition，with the characteristics of contiguous distribution. However，the injection and production have poor correspondence in the development process，which indicates that the internal configuration and overlapping style of the contiguous sand bodies are complex. Based on modern sedimentation and numerical simulation，combined with core，well logging and dynamic data，the sedimentary facies and sand bodies of Chang 611 reservoir in Sai 160 well area of Ansai oilfield were analyzed，its internal sand body configuration characteristics were defined，and the sand body evolution stages were divided. The results show that：（1）Sai 160 well area is a typical shallow delta sedimentary facies of meandering river，which develops four sedimentary microfacies： underwater distributary channel，mouth bar，sheet sand and intertributary bay.（2）Typical bar finger sand bodies are developed in shallow water deltas on the plane in the study area，and most channels are distributed in the middle of mouth bars，forming a plane distribution pattern of river in the middle and mouth bars on both sides.（3）In the cross provenance direction， distributary channels are more deep but do not cut through the mouth bar， forming a riverbar combination style of “river walking on the bar”. Along the provenance direction，a single mouth bar sand body is deposited forward to form a complex mouth bar sand body.（4）Argillaceous or physical interlayers are developed between different mouth bars，resulting in incomplete connectivity of contiguous sand bodies. The length and width of a single mouth bar are 280-1 400 m and 200-420 m，respectively. The size（ratio of length to width）and forward deposit dip angle of the mouth bar are similar in the same stage，while the along source length and forward deposit dip angle of the mouth bar decrease in different periods， but the width has no obvious change.

Key words: shallow water delta, bar finger, reservoir configuration, Yanchang Formation, Triassic, Ansai oilfield, Ordos Basin

CLC Number: 

  • TE122.3
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