南海海泥中甲烷水合物生成特性的实验研究

在定容条件下，实验研究了甲烷水合物在含水量不同的多孔海泥中的生成特性。所使用的海泥平均孔径为12178 nm，总孔容为4997×10-2 ml/g，比表面积为16412 m2/g。所用海泥样品含水量为40%，实验的温度范围为27415~28115 K，初始生成压力范围为102~144 MPa。实验结果表明，甲烷水合物在海泥中的生成速率以及气体消耗量随着初始压力的增加而增大，随着温度的降低而增大。海泥的复杂孔隙结构能够促进水合物的成核，但会降低水的最终转化率，其作用随着温度的升高与压力的降低而增大。

Experimental Study on Formation Behavior of Methane Hydrate in Sea Mud from South China Sea

The formation behaviors of methane hydrate in the sea mud from South China Sea were studied. The sea mud with mean pore diameter of 12178 nm and total pore volume of 4997×10-2 ml/g, surface area of 16412 m2/g was used for the experiments. The mass fraction of water in the sea mud is 40%. The experiments were carried out at the temperature range of 27415-28115 K and the initial formation pressure range of 102-144 MPa. The experiment results show that the formation rate of methane hydrate in the sea mud and the gas consumption increase with the increase of initial formation pressure and increase with the decrease of temperature. The complex pore structure of the sea mud can promote the nucleation of the hydrate, but reduce the final conversion of the water,and this effect will be strengthened with the increase of the temperature and the decrease of the initial formation pressure.