Numerical Modeling of Gas Hydrate Recycling in Complex Media: Implications for Gas Migration Through Strongly Anisotropic Layers

Autor: A. Peiraviminaei, S. Gupta, B. Wohlmuth
Rok vydání: 2022
Předmět:
Geophysics
GENERAL
Climate and interannual variability
Numerical modeling
NATURAL HAZARDS
Atmospheric
Geological
Oceanic
Physical modeling
Climate impact
Risk
Disaster risk analysis and assessment
OCEANOGRAPHY: PHYSICAL
Air/sea interactions
Decadal ocean variability
Ocean influence of Earth rotation
Sea level: variations and mean
Surface waves and tides
Tsunamis and storm surges
PALEOCEANOGRAPHY
POLICY SCIENCES
Benefit-cost analysis
RADIO SCIENCE
Radio oceanography
SEISMOLOGY
Earthquake ground motions and engineering seismology
Volcano seismology
VOLCANOLOGY
Volcano/climate interactions
Atmospheric effects
Volcano monitoring
Effusive volcanism
Mud volcanism
Explosive volcanism
Volcanic hazards and risks
Research Article [Geomagnetism and Paleomagnetism/Marine Geology and Geophysics
ATMOSPHERIC COMPOSITION AND STRUCTURE
Air/sea constituent fluxes
Volcanic effects
BIOGEOSCIENCES
Climate dynamics
Modeling
COMPUTATIONAL GEOPHYSICS
Numerical solutions
CRYOSPHERE
Avalanches
Mass balance
GEODESY AND GRAVITY
Ocean monitoring with geodetic techniques
Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions
Global change from geodesy
GLOBAL CHANGE
Abrupt/rapid climate change
Climate variability
Earth system modeling
Impacts of global change
Land/atmosphere interactions
Oceans
Regional climate change
Sea level change
Solid Earth
Water cycles
HYDROLOGY
Climate impacts
Hydrological cycles and budgets
INFORMATICS
MARINE GEOLOGY AND GEOPHYSICS
Gas and hydrate systems
Gravity and isostasy
ATMOSPHERIC PROCESSES
Climate change and variability
Climatology
General circulation
Ocean/atmosphere interactions
Regional modeling
Theoretical modeling
OCEANOGRAPHY]
Space and Planetary Science
Geochemistry and Petrology
Earth and Planetary Sciences (miscellaneous)
ddc
Zdroj: S. Gupta
Earth and Space Science Open Archive
ISSN: 2169-9356
2169-9313
Popis: Burial driven recycling is an important process in the natural gas hydrate (GH) systems worldwide, characterized by complex multiphysics interactions like gas migration through an evolving gas hydrate stability zone (GHSZ), competing gas-water-hydrate (i.e., fluid-fluid-solid) phase transitions, locally appearing and disappearing phases, and evolving sediment properties (e.g., permeability, reaction surface area, and capillary entry pressure). Such a recycling process is typically studied in homogeneous or layered sediments. However, there is mounting evidence that structural heterogeneity and anisotropy linked to normal and inclined fault systems or anomalous sediment layers have a strong impact on the GH dynamics. Here, we consider the impacts of such a structurally complex media on the recycling process. To capture the properties of the anomalous layers accurately, we introduce a fully mass conservative, high-order, discontinuous Galerkin (DG) finite element based numerical scheme. Moreover, to handle the rapidly switching thermodynamic phase states robustly, we cast the problem of phase transitions as a set of variational inequalities, and combine our DG discretization scheme with a semi-smooth Newton solver. Here, we present our new simulator, and demonstrate using synthetic geological scenarios, (a) how the presence of an anomalous high-permeability layer, like a fracture or brecciated sediment, can alter the recycling process through flow-localization, and more importantly, (b) how an incorrect or incomplete approximation of the properties of such a layer can lead to large errors in the overall prediction of the recycling process. Key Points Structural heterogeneity linked to inclined fault systems or anomalous sediment layers have a strong impact on the gas hydrate dynamics The presence of anomalous high-permeability layers within gas hydrate stability zone alters the recycling process through flow-localization The presented discontinuous Galerkin scheme is able to accurately capture the gas hydrate recycling processes through strongly anisotropic materials
Databáze: OpenAIRE
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