Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (6): 28-34.doi: 10.12108/yxyqc.20250603

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Formation mechanism of high-quality sand bodies caused by land floods: A case study of flood sediments of No. 2 dam in Tandonggou, Yaojie area, Lanzhou

LI Xiangbo, LIU Huaqing, HAO Bin, YANG Zhanlong, ZHANG Jing, LIU Zhenhua, LI Zhiyong, LI Zaiguang   

  1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China
  • Received:2025-03-12 Revised:2025-06-20 Online:2025-11-01 Published:2025-11-07

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Abstract: Through field geological investigation, and experimental analysis and testing, the characteristics of flood sediments in the debris flow prone areas of Tandonggou in Yaojie area, Lanzhou were clarified, and the formation mechanism of high-quality sand bodies was revealed. The results show that: (1) Flood sediments of Tandonggou in Yaojie area, Lanzhou are classified into four types: gravel(G), coarse sand containing gravel (C), medium fine sand(MS), and silty sediment with fine sand(clay)(FM). They distribute in an orderly manner from upstream to downstream. Medium fine sand(MS)continuously distributes in the downstream section of the catchment area, with good sorting, which is the high-quality sand body.(2) The ordered distribution of flood sediments in study area is related to the transformation of debris flow(non Newtonian fluid)into traction flow(Newtonian fluid)during fluid transport, which is jointly controlled by the"V"-shaped turning river channel and changes in terrain slope in the region.The mechanical differentiation effect of traction and the collision and fragmentation among high-energy flood particles are the main reasons for the formation of high-quality sand bodies in the study area.

Key words: debris flow, traction flow, flood event, high-quality sand body, C-M diagram, modern sedimentation, terrestrial environment

CLC Number: 

  • TE122
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