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<p>The long-term depressurization-induced gas production in hydrate reservoirs requires an in-depth geomechanical understanding of hydrate-bearing sediments during hydrate dissociation. In this study, a customized triaxial apparatus was employed to investigate the stress and volumetric behaviors of hydrate-bearing sediments with sandy and clayey–silty skeletons subjected to various hydrate dissociation ratios and effective confining pressures. The results show that the peak strength, secant modulus and dilation angle of hydrate-bearing sediments generally decrease with increasing hydrate dissociation ratio and decreasing effective confining pressure, but the variations in Poisson’s ratio slightly decrease with hydrate dissociation. Hydrate dissociation decreases the peak strength of sandy hydrate-bearing sediments by decreasing the cohesion and friction angle, while that of clayey–silty hydrate-bearing sediments is mainly related to decreasing hydrate dissociation-induced cohesion. A slight hydrate dissociation can lead to a significant strength reduction, and even under final identical hydrate saturations, the strength parameters of hydrate-bearing sediments that experienced hydrate dissociation are lower than those without hydrate dissociation. Thus, a semiempirical peak strength prediction model for hydrate-bearing sediments during hydrate dissociation is proposed and validated in this work, which allows for the estimation of the peak strength of hydrate-bearing sediments through hydrate saturation, skeleton type and stress state.</p>

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The geomechanical responses of hydrate-bearing sandy and clayey–silty sediments during hydrate dissociation by depressurization: mechanical parameters evolution and prediction

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Zhichao Liu,
  • Wei Hu,
  • Yingjie Zhao,
  • Changfu Wei,
  • Jiazuo Zhou,
  • Tao Zuo,
  • Liqing Sun,
  • Xiaofeng Dou,
  • Qi Wu,
  • Fulong Ning

摘要

The long-term depressurization-induced gas production in hydrate reservoirs requires an in-depth geomechanical understanding of hydrate-bearing sediments during hydrate dissociation. In this study, a customized triaxial apparatus was employed to investigate the stress and volumetric behaviors of hydrate-bearing sediments with sandy and clayey–silty skeletons subjected to various hydrate dissociation ratios and effective confining pressures. The results show that the peak strength, secant modulus and dilation angle of hydrate-bearing sediments generally decrease with increasing hydrate dissociation ratio and decreasing effective confining pressure, but the variations in Poisson’s ratio slightly decrease with hydrate dissociation. Hydrate dissociation decreases the peak strength of sandy hydrate-bearing sediments by decreasing the cohesion and friction angle, while that of clayey–silty hydrate-bearing sediments is mainly related to decreasing hydrate dissociation-induced cohesion. A slight hydrate dissociation can lead to a significant strength reduction, and even under final identical hydrate saturations, the strength parameters of hydrate-bearing sediments that experienced hydrate dissociation are lower than those without hydrate dissociation. Thus, a semiempirical peak strength prediction model for hydrate-bearing sediments during hydrate dissociation is proposed and validated in this work, which allows for the estimation of the peak strength of hydrate-bearing sediments through hydrate saturation, skeleton type and stress state.