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细砂沉积物中水合物生成过程研究

, PP. 360-367

Keywords: 气体水合物,生成动力学,水合物转化率,多孔介质,热力学

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Abstract:

?本实验采用甲烷和混合气体(CH4:91.85%,C2H6:5.09%,C3H8:3.06%)作为气源,利用自制实验系统研究在不同的温度和压力条件下,水合物在不同粒径分布的沉积物体系(150~250和250~380μm)中的生成过程.结果表明,水合物在沉积物中的生成速率与沉积物粒径、气源组分、孔隙水盐度以及温度压力条件都有关系.在沉积物+盐水体系里,混合气生成水合物的诱导时间非常短,反应体系达到水合物生成条件时,沉积物内便开始有水合物生成,而且初始阶段的水合物生成速率比较大.温度压力对水合物生成过程规律影响不明显,在不同的沉积物体系中,混合气水合物的生成过程可以分为3个阶段,即快速反应阶段、反应平稳阶段和尾声阶段.在相同的沉积物体系中,相同的初始压力下,甲烷水合物的转化率随着温度的上升而降低.粒径介于250~380μm的沉积物体系内甲烷水合物的转化率要大于粒径介于150~250μm的沉积物体系中甲烷水合物的转化率.但是两种粒径的沉积物体系中,混合气水合物的转化率结果相差不大.

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