推进天然气水合物资源开采是我国能源战略的重要任务。水合物沉积物的层状赋存形态在目标开采区域中普遍存在，会直接诱发剪切应变影响储层的稳定性，严重制约水合物资源的安全开采。现有水合物沉积物的本构表征主要基于空间均匀分布、各向同性的材料特征假设，缺少考虑水合物沉积物的强非线性力学特性受层状赋存形态影响的本构表征方法，无法准确预测目标开采储层的应力应变规律。本项目围绕储层中层状赋存形态对水合物沉积物的力学特性影响机理展开研究，拟采用高压低温三轴仪对层状赋存形态的水合物沉积物试样进行三轴压缩试验，揭示影响其力学特性的关键因素，阐明在外部荷载作用下其力学性质的演化规律，构建层状赋存含水合物沉积物的均匀化本构表征模型，提出基于测井数据的原位岩芯试样本构模型参数确定方法，以期更加准确描述我国南海原位储层中层状赋存含水合物沉积物的本构行为，为保障我国天然气水合物安全开采提供重要的理论依据。

Advancing the gas hydrate exploitation is one of the most important tasks for China's future energy strategy. The interbedded formation of hydrate-bearing sediments is a common feature in many target production regions, which directly induces shear strain to mobilize the reservoir stability and restrain the safe exploitation of hydrate resources severely. The existing constitutive characterization of hydrate-bearing sediments is mainly based on the assumption of homogeneous and isotropic material properties, and without a sound constitutive characterization method to consider the strong non-linear mechanical properties of hydrate-bearing sediments affected by the interbedded formation, that leads to inaccurate estimation of the stress and strain responses of the target production region. This study will focus on the influence mechanism of the interbedded formation on the mechanical properties of hydrate-bearing sediment in the hydrate reservoir. A high-pressure low-temperature triaxial apparatus shall be used to conduct triaxial compression tests on prepared interbedded hydrate soil samples, to investigate the key influence factors on the mechanical properties and to study the evolution of mechanical properties under external loads. The constitutive model of the interbedded hydrate-bearing sediments by adopting homogenization technique shall be established, and the model parameter calibration method for the in-situ pressure cores correlating to the site well-log data shall be proposed, so that we can more accurately describe the constitutive behavior of the south China sea interbedded hydrate-bearing sediments in the reservoir. This research provides an important theoretical basis for ensuring the safe production of the hydrates gas in China.