Abstract:

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.

Key words: marine gas hydrates, geochemical anomaly, ionic concentration, experimental apparatus