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Modeling oceanic sedimentary methane hydrate growth through molecular dynamics simulation.

Ángel M Fernández-Fernández1, Álvaro Bárcena1, María M Conde2

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|April 9, 2024
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Summary

Methane hydrate crystallization in silica pores was simulated. Confinement and salinity significantly alter hydrate stability and structure compared to unconfined conditions.

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Area of Science:

  • Geochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Methane hydrates are crucial in geological carbon cycles and energy resources.
  • Understanding hydrate formation in porous media is vital for predicting seabed stability and gas recovery.
  • Confinement effects in geological settings like silica pores are not fully understood.

Purpose of the Study:

  • To investigate methane hydrate crystallization within a confined silica pore.
  • To analyze the impact of salinity on confined methane hydrate stability and structure.
  • To compare confined hydrate behavior with unconfined conditions.

Main Methods:

  • Molecular dynamics simulations were employed.
  • An atomistic quartz silica slit pore model was designed.
  • Methane hydrate seeds were simulated with water, methane, and NaCl at various concentrations.

Main Results:

  • Methane hydrate crystallized within the silica pore, exhibiting ionic doping.
  • Increasing salinity and confinement induced structural distortions in the hydrate.
  • Confinement and pore hydrophilicity caused greater deviations in hydrate phase equilibria than salinity alone.

Conclusions:

  • Confinement geometry and pore hydrophilicity are key factors influencing methane hydrate phase equilibria.
  • Salinity impacts confined methane hydrate stability, but confinement effects are more pronounced.
  • This study provides insights into hydrate behavior under simulated seabed conditions.