天然气水合物储层力学特性研究进展

自然界中的水合物一般产出于深水海底浅层未固结成岩的松散沉积物中和陆域冻土区岩石裂隙或孔隙中。水合物的分解会导致地层胶结强度、孔隙度、地质结构等发生变化，从而引发地质灾害，严重威胁水合物资源的安全开采。本文在大量调研文献的基础上，结合已有的天然气水合物制样、三轴力学测试研究现状和本构模型研究进展，系统分析影响含水合物沉积物的力学特性的主要因素和本构模型的发展趋势，梳理了获得的共识和存在的问题，提出了下一步研究方向，从而为下一步含水合物沉积物力学强度实验、本构模型开发以及储层稳定性研究等提供参考。

Research Progress in Mechanical Properties of Gas Hydrate Reservoirs

Hydrates in nature generally occur in unconsolidated sediments in shallow seabed of deep water and in rock fissures or pores in land permafrost. The decomposition of hydrate will lead to changes in formation cementation strength, porosity and geological structure, which will lead to geological hazards and seriously threaten the safe exploitation of hydrate resources. On the basis of a large number of current researches for the methods of the hydrate sample preparation and tri-axial mechanical testing and the constitutive models, this paper systematically analyzed the main factors that affect the mechanical properties of natural gas hydrate-bearing sediments and introduced the development trend of the constitutive models, and combed out the consensus and the existing problems, and puts forward some suggestions. This paper also suggested the future work of the mechanical strength test of hydrate sediments, the development of constitutive model and the study of reservoir stability and offered the reference for the research of natural gas hydrates in our country.