层间非均质含天然气水合物沉积物力学性质数值模拟研究  

Numerical simulation study on mechanical properties of interlayer heterogeneous natural gas hydrate sediments

作　　者：叶瑞杰 蒋宇静[1,2] 张瑞琪 公彬[1] 张博文[1] YE Ruijie;JIANG Yujing;ZHANG Ruiqi;GONG Bin;ZHANG Bowen(College of Energy and Ming Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Graduate School of Engineering,Nagasaki University,Nagasaki 852-8521,Japan)

机构地区：[1]山东科技大学能源与矿业工程学院,山东青岛266590 [2]长崎大学研究生院工学研究科,日本长崎852-8521

出　　处：《山东科技大学学报（自然科学版）》2024年第2期22-29,共8页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(520095077);山东省自然科学基金项目(2022HWYQ-078);山东省泰山学者青年专家计划项目(Tsqn202103074)。

摘　　要：为探究含天然气水合物夹层的砂岩储层的力学性质及剪切破坏机理,采用离散元法制备含天然气水合物夹层的砂岩储层试样,进行了一系列双轴剪切试验。研究结果表明:当天然气水合物夹层的饱和度低于15%,且夹层厚度小于1/5时,砂岩储层整体强度降低;当水合物夹层的饱和度超过35%,含水合物夹层厚度超过1/2时,水合物夹层才能增强整个试样的强度。含水合物夹层的失效形式与上覆层和下伏层的失效形式不同,含水合物夹层的破坏主要归因于水合物颗粒与周围颗粒的胶结作用的破坏。To investigate the mechanical properties and shear failure mechanisms of sandstone reservoirs with gas hydrate interlayers,we employed the discrete element method to prepare sandstone reservoir samples containing gas hydrate interlayers and conducted a series of biaxial shear tests.The results indicate that there is a reduction in the overall strength of the sandstone reservoir when the natural gas hydrate interlayer saturation is below 15%and the interlayer thickness is less than 1/5 and that the hydrate interlayer can strengthen the entire sample when the saturation of the hydrate interlayer surpasses 35%and the interlayer thickness exceeds 1/2.The failure mode of the hydrate-bearing interlayer differs from that of the overlying and underlying layers.The failure of the hydrate-bearing interlayer is primarily attributed to the breakdown of cementation between the hydrate particles and surrounding particles.

关 键 词：天然气水合物 含水合物夹层 层间非均质 数值模拟 力学性质 失效模式 

分 类 号：P744.4[天文地球—海洋科学]