Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (3): 73-83.doi: 10.12108/yxyqc.20250307

• PETROLEUM EXPLORATION • Previous Articles    

Characteristics and quantitative prediction of structural fractures in the second member of Triassic Xujiahe Formation in Xinchang area， western Sichuan Basin

YANG Xu1,2, BAI Mingsheng1,2, GONG Hanbo3, LI Gao1,2, TAO Zuwen1   

  1. 1. College of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China;
    2. Underbalanced/Gas Drilling Laboratory, National Engineering Research Center of Oil & Gas Drilling and Completion Technology, Chengdu 610500, China;
    3. Southwest Oil & Gas Branch, Sinopec, Chengdu 610041, China
  • Received:2024-08-29 Revised:2024-11-06 Published:2025-05-10

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Abstract: The second member of Triassic Xujiahe Formation in Xinchang area of western Sichuan Basin has dense reservoirs，the development and distribution of structural fractures are crucial for the efficient development of gas reservoirs. Based on imaging logging data，the development characteristics of reservoir structural fractures in the study area were analyzed. Based on the heterogeneous rock mechanics model，the numerical simulation and quantitative prediction of the tectonic stress field and structural fractures in the target layer during Himalayan period were carried out by using the finite element simulation method，rock fracture criterion and elastic strain energy. The results show that：（1）The fractures in the second member of Triassic Xujiahe Formation in Xinchang area of western Sichuan are mainly structural shear fractures，with fractures trending in NWW direction，NEE direction，near EW direction，and SN direction according to their development degree. The formation stages of the fractures mainly include the late Indosinian，Yanshanian，early Himalayan，and late Himalayan. The fractures formed in the late Indosinian and Yanshanian filled with calcite or quartz，and only the fractures formed in Himalayan were effective.（2）During the Himalayan movement，the maximum horizontal principal stress of the second member of Xujiahe Formation was mainly 65-100MPa，and the minimum horizontal principal stress was mainly 50-85MPa. The tectonic position and lithofacies of the strata controlled the stress distribution.（3）The average density of structural fractures in the research area is relatively small，at 0.28 fractures per meter，and the density of fractures near the faults is greater than 1.20 fractures per meter. The density of fractures in different lithofacies varies significantly. The distribution of fractures is jointly controlled by factors such as faults，tectonic position，and lithofacies.（4）The average absolute percentage error between the fracture prediction results and the measured results is 11.40%，and the prediction results are reliable.

Key words: structural fractures, structural stress field, numerical simulation, fracture quantitative prediction, tectonic position, lithofacies, the second member of Xujiahe Formation, Triassic, Xinchang area, western Sichuan Depression

CLC Number: 

  • TE122.2
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