Permeability variation in the presence of hydrates plays an important role in hydrate dissociation and may lead to extraction issues. Therefore, a wide range of pore-scale studies considering the hydrate growth habit have been conducted by various researchers. Here, we use microscopic training images of hydrate-bearing sediment to replicate the micromorphology of hydrates and coexisting hydrate growth habits (pore filling and coating) into 2D reconstruction models by multiple point statistics (MPS). Accounting for the geometric differences between each realisation and the different ratios between coating hydrate and pore-filling hydrate, permeability simulation is performed by the lattice Boltzmann Method (LBM). Results show that subtle geometric differences of hydrates may result in great changes in permeability for a given hydrate saturation for the same hydrate growth habit. The Kozeny–Carman model for single hydrate growth habit can also be used for the hydrate-bearing sediment with coexisting hydrate growth habits if the ratio of these two hydrate saturations is about 4, where the effect of coating or pore-filling hydrate can be neglected. This reconstruction model agrees well with experimental results and can be easily implemented in reservoir simulators for complex hydrate distributions.

中文翻译：

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并存水合物生长习惯的含水合物沉积物中水渗透性的二维研究

水合物存在下的渗透率变化在水合物分解中起重要作用，并可能导致萃取问题。因此，各种研究人员已经进行了考虑水合物生长习性的各种孔隙规模研究。在这里，我们使用含水沉积物的微观训练图像，通过多点统计（MPS）将水合物的微观形态和共存的水合物生长习惯（孔填充和涂层）复制到二维重建模型中。考虑到每个实现之间的几何差异以及涂层水合物和孔隙填充水合物之间的比率不同，使用晶格玻尔兹曼方法（LBM）进行渗透性模拟。结果表明，对于相同的水合物生长习惯，对于给定的水合物饱和度，水合物的细微几何差异可能会导致渗透率发生很大变化。如果这两种水合物饱和度的比率约为4，则可以忽略单一水合物生长习性的Kozeny-Carman模型，用于同时存在水合物生长习性的含水合物沉积物，此时可以忽略涂层或孔隙填充水合物的影响。该重建模型与实验结果非常吻合，可以轻松地在储层模拟器中实现复杂的水合物分布。可以忽略涂层或孔隙填充水合物的影响。该重建模型与实验结果非常吻合，可以轻松地在储层模拟器中实现复杂的水合物分布。可以忽略涂层或孔隙填充水合物的影响。该重建模型与实验结果非常吻合，可以轻松地在储层模拟器中实现复杂的水合物分布。