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Chemo-mechanical coupling in kerogen gas adsorption/desorption.

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Gas adsorption causes significant volume expansion in kerogen, impacting shale gas production and carbon sequestration. This chemo-mechanical coupling highlights the dynamic nature of kerogen, challenging rigid structure assumptions.

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Area of Science:

  • Geochemistry
  • Materials Science
  • Petroleum Engineering

Background:

  • Kerogen is crucial for hydrocarbon generation in oil/gas reservoirs.
  • Subsurface kerogen experiences stress confinement and relaxation.
  • The interaction between mechanical deformation and gas adsorption in kerogen is poorly understood, yet vital for shale gas production.

Purpose of the Study:

  • To investigate the chemo-mechanical coupling between gas adsorption and mechanical strain in kerogen.
  • To quantify the volume changes of kerogen upon methane (CH4) and carbon dioxide (CO2) adsorption.
  • To assess the impact of kerogen swelling on gas uptake and reservoir properties.

Main Methods:

  • Utilized a hybrid Monte Carlo/molecular dynamics simulation approach.
  • Simulated CH4 and CO2 adsorption on a kerogen matrix at high pressure (192 atm).
  • Analyzed kerogen volume expansion, gas uptake, surface area, porosity, and pore size changes.

Main Results:

  • Demonstrated a strong chemo-mechanical coupling between gas adsorption and kerogen matrix strain.
  • Observed kerogen volume expansion of up to 5.4% for CH4 and 11% for CO2 adsorption.
  • Found that gas uptake is significantly enhanced by kerogen swelling, which also increases surface area and porosity.
  • Volume expansion increases quadratically with adsorbed gas amount, indicating surface layer dominance.

Conclusions:

  • Kerogen exhibits a dynamic nature, with significant volume changes upon gas adsorption.
  • Current assumptions of rigid kerogen structure may be invalid for estimating gas-in-place and carbon sequestration capacity.
  • The chemo-mechanical coupling between gas adsorption and kerogen deformation must be considered in reservoir engineering and subsurface storage applications.