TY  - JOUR
AU  - Tang, Longhao
AU  - Wang, Tingyi
AU  - Liu, Yunlei
AU  - Zhou, Haigang
PY  - 2026
DA  - 2026/05/06
TI  - Methane Interface Desorption Mechanism in Geological Reservoirs After Natural Gas Hydrate Decomposition
JO  - Reservoir Science
T2  - Reservoir Science
JF  - Reservoir Science
VL  - 2
IS  - 3
SP  - 172
EP  - 188
DO  - 10.62762/RS.2025.633924
UR  - https://www.icck.org/article/abs/RS.2025.633924
KW  - hydrate decomposition
KW  - reservoir energy
KW  - reservoir transformation
KW  - methane desorption
KW  - energy resource exploitation
AB  - The morphological transformation of methane hydrates during re-exploitation, caused by depressurization and changes in reservoir environment, significantly impacts hydrate extraction. The present study explores the adsorption and desorption behaviour of methane under different environmental factors by constructing a rock adsorption and desorption device, which can contribute to the efficient extraction of methane during the decomposition of methane hydrates. The findings demonstrate that reservoir temperature strongly promotes methane desorption. Desorption capacity increased markedly above $100^{\circ}\mathrm{C}$, reaching $9.4~\mu\mathrm{g/g}$ at $120^{\circ}\mathrm{C}$, consistent with reduced adsorption enthalpy ($\Delta H_{\text{ads}}$ from $-4.2$ to $-5.2\times10^{-3}$ kJ/mol) and increased Gibbs free energy favoring desorption. In contrast, higher reservoir pressure enhanced the drag force of the driving fluid, with methane desorption showing a sharp increase at pressures around $25$ MPa, although low pressures yielded only marginal improvements. In addition, methane desorption rose from $5.3~\mu\mathrm{g/g}$ in low-CO$_2$ formulations to $8.2~\mu\mathrm{g/g}$ at $90%$ CO$_2$ content, driven by increased drag force (from $2.5\times10^{-3}$ N to $4.3\times10^{-3}$ N) and reduced adsorption energy (from $6.2\times10^{-4}$ N to $4.8\times10^{-4}$ N). Among reservoir minerals, montmorillonite showed the highest methane desorption capacity due to its lowest adsorption enthalpy and strong electrostatic repulsion, followed by illite, while kaolinite exhibited the weakest desorption performance. In conclusion, the present study provides fundamental data for the desorption and efficient extraction of methane leaked into geological reservoirs after the decomposition of methane hydrates.
SN  - 3070-2356
PB  - Institute of Central Computation and Knowledge
LA  - English
ER  - 

@article{Tang2026Methane,
  author = {Longhao Tang and Tingyi Wang and Yunlei Liu and Haigang Zhou},
  title = {Methane Interface Desorption Mechanism in Geological Reservoirs After Natural Gas Hydrate Decomposition},
  journal = {Reservoir Science},
  year = {2026},
  volume = {2},
  number = {3},
  pages = {172-188},
  doi = {10.62762/RS.2025.633924},
  url = {https://www.icck.org/article/abs/RS.2025.633924},
  abstract = {The morphological transformation of methane hydrates during re-exploitation, caused by depressurization and changes in reservoir environment, significantly impacts hydrate extraction. The present study explores the adsorption and desorption behaviour of methane under different environmental factors by constructing a rock adsorption and desorption device, which can contribute to the efficient extraction of methane during the decomposition of methane hydrates. The findings demonstrate that reservoir temperature strongly promotes methane desorption. Desorption capacity increased markedly above \$100^{\circ}\mathrm{C}\$, reaching \$9.4~\mu\mathrm{g/g}\$ at \$120^{\circ}\mathrm{C}\$, consistent with reduced adsorption enthalpy (\$\Delta H\_{\text{ads}}\$ from \$-4.2\$ to \$-5.2\times10^{-3}\$ kJ/mol) and increased Gibbs free energy favoring desorption. In contrast, higher reservoir pressure enhanced the drag force of the driving fluid, with methane desorption showing a sharp increase at pressures around \$25\$ MPa, although low pressures yielded only marginal improvements. In addition, methane desorption rose from \$5.3~\mu\mathrm{g/g}\$ in low-CO\$\_2\$ formulations to \$8.2~\mu\mathrm{g/g}\$ at \$90\%\$ CO\$\_2\$ content, driven by increased drag force (from \$2.5\times10^{-3}\$ N to \$4.3\times10^{-3}\$ N) and reduced adsorption energy (from \$6.2\times10^{-4}\$ N to \$4.8\times10^{-4}\$ N). Among reservoir minerals, montmorillonite showed the highest methane desorption capacity due to its lowest adsorption enthalpy and strong electrostatic repulsion, followed by illite, while kaolinite exhibited the weakest desorption performance. In conclusion, the present study provides fundamental data for the desorption and efficient extraction of methane leaked into geological reservoirs after the decomposition of methane hydrates.},
  keywords = {hydrate decomposition, reservoir energy, reservoir transformation, methane desorption, energy resource exploitation},
  issn = {3070-2356},
  publisher = {Institute of Central Computation and Knowledge}
}