Influence of Hydrate-Forming Gas Pressure on Equilibrium Pore Water Content in Soils

Natural gas hydrates (primarily methane hydrates) are considered to be an important and promising unconventional source of hydrocarbons. Most natural hydrate accumulations exist in pore space associated with reservoir rocks. Therefore, studies porous media particular interest, as well as, the phase equilibria hydrates, including determination equilibrium water content (nonclathrated water). Nonclathrated is analogous unfrozen permafrost soils has a significant effect on properties hydrate-bearing reservoirs. hydrate-saturated will depend many factors: pressure, temperature, composition, mineralization water, etc. In this paper, study mostly focused hydrate-forming pressure nonclathrated soils. To solve problem, simple thermodynamic equations were proposed which require data activity (or content). Additionally, it possible recalculate from one another using equations. The comparison showed sufficiently good agreement between calculated its direct measurements for investigated discrepancy was ~0.15 wt% comparable accuracy measurements. It established that highly nonlinear. For example, most pronounced observed range 6.0 MPa. developed technique can used different gases such methane, ethane, propane, nitrogen, carbon dioxide, various mixtures, gases.