An analytic nonlinear model of thermo-poro-elastic pressure transients in porous rocks with application to deep CO2 storage.
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Abstract
Today a CO2 storage/sequestration is an important option for a significant enhancing of CO2
sinks, to reduce the net carbon emissions into our planet atmosphere. Such storage/sequestration
is a complex process, dealing with many facets of decision about the site selection, taking into
consideration the local geological, geothermal, hydrodynamic and hydrocarbon potentials. In such
multifaceted context, a thermo-poro-elastic nonlinear analytic model of fluid pressure P in deep
rocks, can play an important role. To analyse these dynamics we here focus on the role of the matrix
convection, on thermal dynamics and fluid/rock “frictions”. In addition we here show that pressure
dynamics, induced by an eventual external time or areal forcing can allow simple analytical
determinations of pressure transients in these deep porous media. Such processes indeed can
have practical impacts on the CO2 evolution for storage in deep rocks and thus influence the final
site choice for a deep CO2 injection. In synthesis, this model provides simple characterizations of
thermo-poro-elastic transients for CO2 storage.
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