Production of methane from hydrate-bearing sediments requires hydrate dissociation for releasing mobile methane gas in sediments prior to gas production operations. Fines may migrate through or clog the pore space of sandy sediments depending on the geometry and topology of the pore space. Multiphase flow experiments were conducted on brine saturated uniform silica sand mixed with different percentages of kaolinite. Fines concentrations were correlated to computed tomography (CT) numbers in their host brine phase. Representative element volume (REV) procedure was used to study local porosity and local fines concentration. A cubical REV with a side length of 850 $\mu \mathrm{m}$ was selected. For low fines content (less than 6%), gas percolated through the specimens with no major particle translation or porosity change. For 6% kaolinite specimen, fractures were initiated, and propagated by densifying surrounding sediments. Local fines concentration study showed that fines migrated through the pores for specimens with fines content less than 6%. For the 6% kaolinite specimen, fines concentrated near fractures due to clogging. Clogging induced an increase in the capillary pressure at the pore throats and caused the capillary pressure to overcome the effective stress between sand particle, and fractures to be initiated. Sand particles experienced up to 200 $\mu \mathrm{m}$ translation and 15° rotation due to gas driven fracture in the 6% kaolinite specimen.

要从含水合物沉积物中生产甲烷，需要进行水合物分解，以便在天然气生产之前在沉积物中释放出可移动的甲烷气体。细粒可能会通过砂质沉积物的孔隙空间迁移或阻塞，这取决于孔隙空间的几何形状和拓扑。在混合有不同百分比高岭石的盐水饱和均匀硅砂中进行了多相流实验。细粉浓度与它们的宿主盐水相中的计算机断层扫描（CT）数量相关。用代表性元素体积（REV）程序研究局部孔隙度和局部细粉浓度。边长为850的立方REV$\mu \mathrm{米}$被选中。对于较低的细粉含量（小于6％），气体渗透通过样品，而没有主要的颗粒平移或孔隙率变化。对于6％的高岭石标本，裂缝开始并通过致密化周围沉积物而扩展。局部细粉浓度研究表明，细粉含量小于6％的样品的细粉会通过孔迁移。对于6％的高岭石试样，由于堵塞，细屑集中在裂缝附近。堵塞导致孔喉处的毛细压力增加，并使毛细压力克服了砂粒之间的有效应力，从而引发了裂缝。沙粒经历了多达200次$\mu \mathrm{米}$ 在6％高岭石样品中，由于气体驱动的断裂而导致平移和15°旋转。