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<p>This study investigates the time-dependent mechanical behavior of laminated fractured rock from tight gas formations in northeast British Columbia, Canada. Sixteen samples with natural laminations and visual fractures were obtained from the Muskwa, Evie, and Montney formations at depths of around 2&#xa0;km. Laboratory creep compressional tests with a multi-stage loading approach were employed to investigate their time-dependent deformation behaviors and failure patterns. The apparent strength and elastic modulus of laminated rock samples with pre-existing fractures were significantly reduced due to larger strain from laminations, fractures, and creep behavior. The pre-existing fractures orientation and distribution were critical to influence the strength, with inclined and Y-shaped fractures significantly reducing strength. The Burgers and fractional calculus models were used to describe creep behaviors, with the latter incorporating a viscoplastic component to capture tertiary creep. The Burgers model demonstrated higher accuracy under low stress, while the fractional calculus model effectively captured all creep stages. Results revealed that laminated and fractured samples exhibit larger creep strains under the same stress levels compared to other rock types, with model parameters significantly smaller than those reported in previous studies on intact rock samples. </p>

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Time-Dependent Behavior of Fractured Rocks from Canadian Shale Gas Plays: Laboratory Testing and Constitutive Modeling

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Huan Yu,
  • Wenbo Zheng,
  • Ranjith Pathegama Gamage,
  • Houquan Zhang

摘要

This study investigates the time-dependent mechanical behavior of laminated fractured rock from tight gas formations in northeast British Columbia, Canada. Sixteen samples with natural laminations and visual fractures were obtained from the Muskwa, Evie, and Montney formations at depths of around 2 km. Laboratory creep compressional tests with a multi-stage loading approach were employed to investigate their time-dependent deformation behaviors and failure patterns. The apparent strength and elastic modulus of laminated rock samples with pre-existing fractures were significantly reduced due to larger strain from laminations, fractures, and creep behavior. The pre-existing fractures orientation and distribution were critical to influence the strength, with inclined and Y-shaped fractures significantly reducing strength. The Burgers and fractional calculus models were used to describe creep behaviors, with the latter incorporating a viscoplastic component to capture tertiary creep. The Burgers model demonstrated higher accuracy under low stress, while the fractional calculus model effectively captured all creep stages. Results revealed that laminated and fractured samples exhibit larger creep strains under the same stress levels compared to other rock types, with model parameters significantly smaller than those reported in previous studies on intact rock samples.