GAS HYDRATE SATURATION AND ITS RELATION WITH GRAIN SIZE OF THE HYDRATE-BEARING SEDIMENTS IN THE SHENHU AREA OF NORTHERN SOUTH CHINA SEA
GAS HYDRATE SATURATION AND ITS RELATION WITH GRAIN SIZE OF THE HYDRATE-BEARING SEDIMENTS IN THE SHENHU AREA OF NORTHERN SOUTH CHINA SEA
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DOI：
10.3724/sp.j.1140.2011.05095
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Wang Jinlian
中科院分区：
文献类型：
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作者：
Wang Jinlian
为探讨南海北方神狐海域天然气水合物沉积物的粒度特征与水合物饱和度的关系，对该海域两个钻孔的沉积物进行了粒度分析。结果表明，该海域含天然气水合物沉积物的主要组分为粉砂，约占沉积物粒度的72%~82%，其次为粘土，其含量为100%~ 200%。通常小于30%;含天然气水合物沉积物的粒度分布模式与不含天然气水合物沉积物的粒度分布模式基本一致，而含砂量小于10%。（0.063~0.032 mm）和砂（0.063~0.5 mm）的沉积物中天然气水合物的饱和度通常较高，这进一步表明粗粒沉积物更有利于天然气水合物的形成。
Grain sizes are analyzed for the sediments taken from two drill holes in the Shenhu area of northern South China Sea in order to understand the relationship between the saturations of gas hydrates and the grain-size of the sediments.Results suggest that the silt fraction is the dominant component of gas-hydrate-bearing sediments in the studied area,making up about 72%~82% of the sedimentary grains.The second component is clay,which is usually less than 30%;whereas the sand fraction is less than 10%.The Grain size distribution pattern of the gas-hydrate-bearing sediments is similar to the non-gas-hydrate-bearing sediments above and below.Coarse silt(0.063~0.032 mm) and sand(0.063~0.5 mm) are usually high in gas hydrates saturations,further suggesting that coarse sediments are more favorable for the formation of gas hydrates.