Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (3): 137-145.doi: 10.12108/yxyqc.20240313

• PETROLEUM EXPLORATION • Previous Articles    

Fracture modeling of shale reservoirs of Silurian Longmaxi Formation in Luobu syncline in Zhaotong National Shale Gas Demonstration Area， southern margin of Sichuan Basin

JI Yubing1, GUO Bingru2, MEI Jue1, YIN Zhijun2, ZOU Chen1   

  1. 1. Integration Center of Exploration & Development, PetroChina Zhejiang Oilfield Company, Hangzhou 310023, China;
    2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2022-11-17 Revised:2023-01-28 Published:2024-04-30

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Abstract: Based on core analysis, imaging logging analysis and 3D seismic data, a multi-scale discrete fracture network modeling method was studied for Long-1 submember of Longmaxi Formation and Wufeng Formation in Luobu syncline in Zhaotong National Shale Gas Demonstration Area, southern margin of Sichuan Basin. The results show that:（1）Extracting the strong response part of ant tracking attributes as a surface can obtain a large-scale discrete fracture network model. Small scale fracture modeling can be established using the random discrete fracture network modeling method, which uses the trend of the fracture band shown by ant tracking properties along the layer slice, which reduces the uncertainty of small-scale fracture simulation.（2）The fractures of Long-1 submember of Longmaxi Formation and Wufeng Formation in Luobu syncline are mainly high angle shear fractures, mostly filled with calcite. The main direction of the fractures is northeast southwest, and the fracture direction explained by imaging logging is consistent with the fault direction explained by nearby seismic interpretation（. 3）The large-scale discrete fracture network model is consistent with the fault location of the drilling, and the development of small-scale fractures is consistent with the leakage of drilling fluid, indicating that the multi-scale discrete fracture network model can better represent the fracture development characteristics of Long-1 submember of Longmaxi Formation and Wufeng Formation in Luobu syncline.（4）The multi-scale discrete fracture network model was applied to optimize the hydraulic fracturing scheme for well Y12H in Luobu syncline, resulting in a high complexity of hydraulic fracturing network and nearly 41% increase in gas production compared to adjacent wells. The multi-scale discrete fracture network model after optimizing the small-scale fracture orientation has a good practical application effect.

Key words: multi-scale fracture modeling, discrete fracture network model, ant-tracking attribute volume, shale reservoir, Longmaxi Formation, Silurian, Luobu Syncline, Zhaotong National Shale Gas Demonstration Area, Sichuan Basin

CLC Number: 

  • TE122.2
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