Modeling dynamic marine gas hydrate systems
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Wenyue Xu
Abstract
Dynamically changing marine gas hydrate systems are the subject of this study. The changes may result from varying pressure or temperature at the seafloor, exploration and exploitation operations, rapid sedimentation or wasting at the seafloor, etc. Pressure and temperature may not be used as independent state variables at the same time to specify the overall state of such dynamic systems. Consequently, a pressure-enthalpy-gas concentration-salinity phase balance model is constructed for calculating phase distribution and transition of the system of marine gas hydrate, which is assumed to contain a liquid phase consisting of water, gas, and salt, a vapor phase consisting of gas only, solid halite, and solid gas hydrate consisting of gas and water. Calculations of phase transition processes demonstrate various dynamic feedback mechanisms involved in dynamically evolving marine gas-hydrate systems. A comprehensive model of fluid flow and transport of heat, water, salt, and gas in marine sediment is developed. Simulations show that gas hydrate dissociation resulting from increasing temperature or decreasing pressure at the seafloor may lead to the development of a three-phase zone with coexistent gas hydrate, free gas, and liquid solution and excess pore pressure in marine gas hydrate systems. The changes considered in this study are rapid (<105 years) with respect to the geological time scale but are sufficiently slow (> 10-2 years) to allow thermodynamic equilibrium throughout. The applicable pressure, temperature, and salinity ranges for the calculations used in this study are sufficiently wide to cover those likely occurring in gas hydrate-bearing marine sediments.
© 2015 by Walter de Gruyter Berlin/Boston
Artikel in diesem Heft
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Artikel in diesem Heft
- Introductory overview: Hydrate knowledge development
- Scanning Electron Microscopy investigations of laboratory-grown gas clathrate hydrates formed from melting ice, and comparison to natural hydrates
- Dynamics of trimethylene oxide in a structure II clathrate hydrate
- The stability of methane hydrates in highly concentrated electrolyte solutions by differential scanning calorimetry and theoretical computation
- The effect of elevated methane pressure on methane hydrate dissociation
- Methane hydrate formation in partially water-saturated Ottawa sand
- Methanol—inhibitor or promoter of the formation of gas hydrates from deuterated ice?
- Investigating the performance of clathrate hydrate inhibitors using in situ Raman spectroscopy and differential scanning calorimetry
- Physical properties and rock physics models of sediment containing natural and laboratory-formed methane gas hydrate
- Experimental studies on the formation of porous gas hydrates
- Investigation of jet breakup and droplet size distribution of liquid CO2and water systems—implications for CO2hydrate formation for ocean carbon sequestration
- Measurement of clathrate hydrate precipitation from CO2solution by a nondestructive method
- Influence of water thermal history and overpressure on CO2-hydrate nucleation and morphology
- Growth-controlling processes of CO2gas hydrates
- Thermodynamic prediction of clathrate hydrate dissociation conditions in mesoporous media
- Modeling dynamic marine gas hydrate systems
- Late-stage, high-temperature processesing in the Allende meteorite: Record from Ca,Fe-rich silicate rims around dark inclusions
- Partitioning of Sr, Ba, Rb, Y, and LREE between alkali feldspar and peraluminous silicic magma
- Nondestructive three-dimensional element-concentration mapping of a Cs-doped partially molten granite by X-ray computed tomography using synchrotron radiation
- A theoretical study of structural factors correlated with 23Na NMR parameters
- Metamorphic formation of Sr-apatite and Sr-bearing monazite in a high-pressure rock from the Bohemian Massif
- Ultra-deep origin of garnet peridotite from the North Qaidam ultrahigh-pressure belt, Northern Tibetan Plateau, NW China
- Letter. Novel high-pressure behavior in chlorite: A synchrotron XRD study of clinochlore to 27 GPa
- Letter. Periodic precipitation pattern formation in hydrothermally treated metamict zircon
- A high pressure X-ray diffraction study of aragonite and the post-aragonite phase transition in CaCO3
