Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (5): 155-165.doi: 10.12108/yxyqc.20250514

• PETROLEUM EXPLORATION • Previous Articles    

Fracture effectiveness evaluation of tight reservoir of Cretaceous Yageliemu Formation in Kelasu structural belt，Kuqa piedmont

XU Sihui1,2,3, ZHAO Jun4, ZHAO Xinjian1,2,3, WANG Junyu4, LI Zhaoping1,2,3, LIN Zongpeng4   

  1. 1. Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla 841000, Xinjiang, China;
    2. R & D Center for Ultra-Deep Complex Reservoir Exploration and Development, CNPC, Korla 841000, Xinjiang, China;
    3. Engineering Research Center for Ultra-Deep Complex Reservoir Exploration and Development, Xinjiang Uygur Autonomous Region, Korla 841000, Xinjiang, China;
    4. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China
  • Received:2025-03-18 Revised:2025-04-25 Published:2025-09-06

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Abstract: The geological structures and pressure systems of Cretaceous Yageliemu Formation in Kelasu structural belt of Kuqa piedmont are complex. The development of natural fractures has significant impacts on the reservoir flow capacity. Focused on evaluation effectiveness of fracture reservoirs from Cretaceous Yageliemu Formation， permeability sensitive parameters such as fracture width，stress-fracture angle difference，and friction coefficient were optimized to establish a fracture effectiveness index（FEI）classification standard based on in-situ stress through multi-parameter coupling. The results show that：（1）The permeability boundary between effective fractures（unfilled or semi-filled）and ineffective fractures（fully filled）of reservoirs from Cretaceous Yageliemu Formation is around 0.2 mD. Increasing fracture width can improve the reservoir permeability.（2）High stressfracture angle differences and high normal stress reduce fracture effectiveness by influencing fracture closure. While high friction coefficients improve fracture effectiveness by increasing shear slip between fracture surfaces. （3）Based on the weights of various in-situ stress parameters that affect the fracture effectiveness，the FEI evaluation standard was established. Applying this FEI evaluation standard to classify and evaluate the reservoirs in the study area，the proportion of Class Ⅰ and Class Ⅱ effective fractures in the central part of the study area is higher， indicating better reservoir effectiveness. Towards the east and west，the proportion of such fractures decreases， resulting in poorer reservoir effectiveness.

Key words: in-situ stress, stress-fracture angle difference, friction coefficient, normal stress, shear stress ratio, fracture effectiveness index, Yageliemu Formation, Cretaceous, Kelasu structural belt, Kuqa Depression

CLC Number: 

  • TE122.2+1
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