摘要
海洋天然气水合物在生成过程中会引起周围沉积物孔隙水中元素地球化学异常, 这些异常是指示天然气水合物存在的重要标志。在自制的实验装置上, 模拟了海洋天然气水合物的生成过程, 对海水中各离子浓度的变化进行了初步研究。结果表明: 在不同的反应条件下, 水合物的生成对各离子浓度变化的影响不同。压力越大, 耗气量越大, 生成水合物的量就大、纯度高, 其排盐效应也较强, 导致海水溶液中离子浓度的增高, 而水合物中离子含量却呈降低趋势。
The elemental geochemical anomaly of pore water in marine sediments during the formation of gas hydrate is a significant indication for marine gas hydrates in the deep sea floor. Based on the experimental apparatus made by ourselves,we simulate the formation process of marine gas hydrates in laboratory, and study the variations of ionic concentrations in seawater preliminarily. The results show that the effects of formation of gas hydrate on the variations of ionic concentrations are not alike in different experimental conditions. The higher the original pressure, the larger the gas consumption, and then higher purity and larger amount hydrates are formed, resulting in stronger salt-exclusion efficiency. Therefore, the ionic concentrations are higher in seawater solution, while lower in the hydrates responding to the original pressure.
出处
《现代地质》
CAS
CSCD
北大核心
2005年第1期96-100,共5页
Geoscience
基金
国家高技术研究发展计划("863"计划)天然气水合物探测技术课题(2001AA6110-20)。
关键词
海洋天然气水合物
地球化学异常
离子浓度
实验装置
marine gas hydrates
geochemical anomaly
ionic concentration
experimental apparatus
