The basic physical properties of marine natural gas hydrate deposits are important to the understanding of seabed growth conditions, occurrence regularity, and occurrence environment of natural gas hydrates. A comprehensive analysis of the core samples of drilling pressure-holding hydrate deposits at a depth of 1310 m in the Shenhu area of the South China Sea was conducted. The experimental results indicate that the particle size in the hydrate sediment samples are mainly distributed in the range from 7.81 µm to 21.72 µm, and the average particle size decreases as the depth of the burial increases. The X-ray CT analytical images and surface characteristics SEM scan images suggest that the sediment is mostly silty clay. There are a large number of bioplastics in the sediment, and the crack inside the core may be areas of hydrate formation.

海洋天然气水合物沉积物的基本物理性质对于理解海床的生长条件，天然气水合物的发生规律和发生环境具有重要意义。对南海神湖地区1310 m深度的保压水合物矿床岩心样品进行了综合分析。实验结果表明，水合物沉积物样品的粒径主要分布在7.81 µm至21.72 µm范围内，平均粒径随埋藏深度的增加而减小。X射线CT分析图像和表面特征SEM扫描图像表明，沉积物主要是粉质粘土。沉积物中有大量生物塑料，岩心内部的裂缝可能是水合物形成的区域。