青海木里三露天天然气水合物分布与储层特征
Distribution and Reservoir Characteristics of Gas Hydrates in Sanlutian of Muli, Qinghai

摘要： 根据在青海木里三露天施工完成的14 口天然气水合物钻孔揭露的地质信息，从天然气水合物产出、赋存、空间展布3个方面介绍工作区天然气水合物基本特征。此外，文章还以岩性特征、空间展布、裂隙、岩石物性多元控制因素 间相互制约和促进的内在联系为桥梁建立了天然气水合物储层这一研究对象。从储层方面分析，受岩相的控制作用三露天天然气水合物在空间上的分布有一定的选择性、延展性和可追索性， 即其储层具有相对稳定性；三露天天然气水合物在储层内部的分布除了受有利储层产状变化限制外，还受到裂隙产状的控制，致使其在空间上分布既不规则、又往往突然消失或突然出现。
Abstract: Based on the geological information derived from 14 gas hydrate drilling holes in Sanlutian of Muli，Qinghai, the basic features of gas hydrates’output, occurrence and spatial distribution are analyzed in this paper. According to the inner connection between inter-restriction and inter-stimulation of multivariate control factors, which is taken as a bridge, the gas hydrate reservoir is introduced as a study subject. From the aspects of reservoir analysis, it shows that the gas hydrate is controlled by lithofacies, which makes its spatial distribution appear to be selective, extensile and comparable to some extent, namely the relative stability of its reservoir appearance in Sanlutian. The gas hydrate distribution in the interior reservoir is also controlled by various occurrence of fracture besides the various occurrence of the reservoir in Sanlutian, leading to irregular distribution in space and frequently sudden disappearance or sudden appearance of gas hydrate