Chemo-thermo-mechanically coupled seismic analysis of methane hydrate-bearing sediments during a predicted Nankai Trough Earthquake

2016 ◽  
Vol 40 (16) ◽  
pp. 2207-2237 ◽  
Author(s):  
T. Akaki ◽  
S. Kimoto ◽  
F. Oka
Keyword(s):  
Methane Hydrate ◽  
Nankai Trough ◽  
Seismic Analysis ◽  
Hydrate Bearing Sediments

scholarly journals Thermal properties of methane hydrate-bearing sediments and surrounding mud recovered from Nankai Trough wells

2014 ◽  
Vol 119 (11) ◽  
pp. 8021-8033 ◽  
Author(s):  
M. Muraoka ◽  
M. Ohtake ◽  
N. Susuki ◽  
Y. Yamamoto ◽  
K. Suzuki ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Methane Hydrate ◽  
Nankai Trough ◽  
Hydrate Bearing Sediments

Geomechanical Responses During Gas Hydrate Production Induced by Depressurization

2016 ◽  
Author(s):  
Ah-Ram Kim ◽  
Gye-Chun Cho ◽  
Joo-Yong Lee ◽  
Se-Joon Kim
Keyword(s):  
Methane Hydrate ◽  
Fossil Fuel ◽  
Gas Production ◽  
Field Scale ◽  
Production Well ◽  
Physical Processes ◽  
Hydrate Dissociation ◽  
Thermal Changes ◽  
New Energy ◽  
Hydrate Bearing Sediments

Methane hydrate has been received large attention as a new energy source instead of oil and fossil fuel. However, there is high potential for geomechanical stability problems such as marine landslides, seafloor subsidence, and large volume contraction in the hydrate-bearing sediment during gas production induced by depressurization. In this study, a thermal-hydraulic-mechanical coupled numerical analysis is conducted to simulate methane gas production from the hydrate deposits in the Ulleung basin, East Sea, Korea. The field-scale axisymmetric model incorporates the physical processes of hydrate dissociation, pore fluid flow, thermal changes (i.e., latent heat, conduction and advection), and geomechanical behaviors of the hydrate-bearing sediment. During depressurization, deformation of sediments around the production well is generated by the effective stress transformed from the pore pressure difference in the depressurized region. This tendency becomes more pronounced due to the stiffness decrease of hydrate-bearing sediments which is caused by hydrate dissociation.

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