Physics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esrv...29..249p&link_type=abstract
Earth Science Reviews, Volume 29, Issue 1-4, p. 249-265.
Physics
1
Scientific paper
Methane genesis from kerogen maturation can induce kilometer-scale flow in a porous medium due to the fluid mass density dependence on methane concentration. The decrease in density with increasing methane content in solution may destabilize a water column, and initiate convective overturns. Conditions favoring these buoyancy-driven flows include a narrow thermal-depth window for methanogenesis and a large initial organic matter content. The self-organizing aspects of methanogenesis-induced flow are explored via the numerical simulation of reaction-transport equations. Cellular convection is demonstrated, and under certain conditions, the flow velocities are found to oscillate in time. For systems with initially random kerogen distribution the convection cells organize into one of a discrete set of well ordered convection cell patterns despite the initial disorder. Simulations initialized with heterogeneous porosity and permeability show that varying sizes and patterns of convection flows may develop which reflect the interplay between the inherent tendency toward self-organization and the nonuniformities in hydraulic properties.
Dewers Thomas
Ortoleva Peter
Park A.
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