The natural barrier to retention of the high concentration of gases: methane and carbon dioxide, methane and hydrogen under hydrothermal vents
The assumed seismic model of the area around fields having high concentrations of CH<sub>4</sub> and CO<sub>2</sub>, CH<sub>4</sub> and H<sub>2</sub> dissolved in hydrothermal vents is first introduced. The model of so-called natural barrier to retention of gases accumulation has been revealed using outcomes of 3D seismic tomography method, which has been developed by the author and utilizing geochemical data that were earlier obtained by other researchers in scientific cruises and university laboratories. The built model is in agreement with a distribution of seismicity (M 2.5-4.5) that occurred during last 5 years. A comparison of diffusion parameters of methane for thermal reservoirs and rocks, and corresponding comparison of geological structures permits to suppose that the presented model can be used to find appropriated area for underground storage of gases mentioned above.