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不同体系下天然气水合物P-T稳定条件及其影响因素的实验研究

, PP. 406-413

Keywords: 孔隙水,石英砂,甲烷水合物,南海沉积物,P-T稳定条件

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Abstract:

?在自制的实验装置上,采用多步升温分解法对不同体系(水溶液、石英砂、海洋沉积物)中甲烷水合物P-T稳定条件进行了研究,探讨了不同离子、浓度及沉积物粒径对水合物P-T稳定条件的影响.结果表明,不同离子对水合物相平衡影响是不同的,而离子浓度的影响趋势是一致的,即浓度越大,相平衡曲线向左偏离越大,甲烷水合物变得越不稳定.粗颗粒(粒径>460μm)石英砂孔隙毛细管作用的影响可以忽略,在粗颗粒石英砂中甲烷的相平衡曲线与纯水中的基本一致;细颗粒(粒径<35μm)石英砂孔隙毛细管作用的影响明显,甲烷水合物稳定温度最大降低1.5K.在实验范围内,甲烷水合物稳定温度在南海神狐海域沉积物中比纯水中平均降低1.9K左右,这主要是由孔隙水的盐度及沉积物的粒度共同作用的结果.由于水合物分解过程中产生的淡水对孔隙水具有稀释作用,孔隙水盐度不断降低,使得每个平衡点测定的甲烷水合物P-T值逐步落在不断降低的盐度曲线上.

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