Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (3): 140-152.doi: 10.12108/yxyqc.20250313

• PETROLEUM EXPLORATION • Previous Articles    

Types and genetic models of sand bodies in shallow water delta front of extremely gentle slope lake basin：A case study of Chang 81 submember of Triassic in Haotan area，Ordos Basin

LIU Yingbao1,2, LI Yuanhao1,2, ZHAI Wenbin1,2, ZHAO Wenxuan1,2, LI Zhe3, YANG Longhua4, GUO Yaqian1,2   

  1. 1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an 710065, China;
    3. Daqing Geophysical Exploration Institute, Research Institute of Eastern Geophysical Company, Daqing 163000, Heilongjiang, China;
    4. Shaanxi Silver Mining Co., Ltd., Shangluo 711405, Shaanxi, China
  • Received:2024-11-25 Revised:2024-12-25 Published:2025-05-10

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Abstract: Based on core，well logging and seismic data，the sand body types and genetic models of extremely gentle slope shallow water delta front of Chang 81 submember of Triassic in Ordos Basin were studied. The results show that：（1）Sedimentary period of Chang 8 in Haotan area is characterized by stable structure，very slow slope（only 0.03°），shallow water and large shoreline migration and swing. Chang 81 submember mainly develops three types of sand bodies：underwater distributary channel，mouth bar，sheet sand，and composite superimposed sand bodies types such as overlapped underwater distributary channel，overlapped underwater distributary channel-mouth bar，and overlapped mouth bar.（2）The proximal delta inner front mainly develops underwater distributary channel sand bodies，and the type of superposition of sand bodies is dominated by multistage superposition of underwater distributary channels，dominated by fluvial action. The logging curves are mainly box or bell shapes，and the thickness of single stage sand bodies（sand thickness > 10 m）is large，with plane distribution in strip. The distal delta inner front mainly develops underwater distributary channels and mouth bar sand bodies，forming three main types of composite superimposed sand bodies types such as overlapped underwater distributary channels，overlapped underwater distributary channel-mouth bars and overlapped mouth bars. The river and lake waves act together. The logging curve shapes are mainly box，bell and funnel， and the single-stage sand body（with a thickness of 5-10 m）is relatively thick，with plane distribution of lobate delta.The outer front of the delta dominated by the action of lake waves mainly develops sheet sand bodies. Vertically，they exhibit multi-stage isolated finger shaped sand bodies，the single-stage sand bodies（thickness < 2 m） are relatively thin，and plane distribution appear as well connected sheet sand bodies.

Key words: shallow water delta front, extremely gentle slope, underwater distributary channel, mouth bar, sheet sand, fluvial action, lake wave action, Chang 81 submember, Triassic, Haotan area, Ordos Basin

CLC Number: 

  • TE121.3
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