Estimation Technique for Gas Hydrate Saturation of Pressure Core Samples

People generally use pressure core technology to collect marine gas hydrate samples to determine the saturation. But it's very difficult to control the temperature and pressure of the sampler. In this paper, we used a thermodynamic model to simulate the process of change in methane's saturation of each phase state in a closed system under the temperature and pressure changes. And we completed a technical analysis hydrate in situ saturation on the marine hydrate thermodynamic system. It only requires the sampler closed without the need for stringent temperature and pressure control. So, it reduces the requirements for the sampler. Examples of analysis showed that, we can estimate the in situ saturation of methane hydrate by measuring the enclosed sample's gas and liquid composition including salinity under the surface.