含水合物沉积物孔隙结构特征与微观渗流模拟研究

含水合物沉积物孔隙结构特征分析和微观渗流模拟是水合物研究的基础性、关键性工作，对深入理解沉积物中水合物的分解机理、储层渗流机理和开采机理有十分重要的意义。总结了国内外含水合物沉积物的微观孔隙探测方法，对比分析了多种微观探测技术应用在水合物研究中的技术特点；重点分析了计算机断层扫描（CT）、扫描电子显微镜（SEM）和核磁共振成像（MRI）技术在含水合物沉积物孔隙结构研究中的应用现状；简述了利用微观数值模拟方法进行含水合物沉积物渗流分析的研究进展；在此基础上，展望了含水合物沉积物孔隙特征分析和微观渗流模拟研究的未来方向和挑战。

ADVANCES IN THE PORE-STRUCTURE CHARACTERISTICS AND MICROSCOPIC SEEPAGE NUMERICAL SIMULATION OF THE HYDRATE-BEARING SEDIMENTS

Study of pore-structure characteristics and numerical simulation of microscopic seepage play fundamental and critical roles in gas hydrate research, which are of great significance for understanding the mechanisms of hydrate dissociation, seepage in sediments, and performance in reservoir exploitation. In this paper, several kinds of microscopic detecting technology are used for identification of hydrate-bearing sediments and their technical characteristics. Three widely-used morphological observation methods, including X-ray Computed Tomography (CT), Scanning Electron Microscope (SEM), and Nuclear Magnetic Resonance Imaging (MRI) are introduced with respect to their functions in the study of the pore structure and characteristics of the gas hydrate-bearing sediments. In addition to it, the advances in numerical simulation for the microscopic seepage in the hydrate-bearing sediments by the PNM and LBM methods are discussed and summarized. Based on the above research, we proposed the future directions and challenges for pore-structure research and microscopic seepage numerical simulation for hydrate-bearing sediments.