10.4122/1.1000000326
Comerlati, Andrea
Andrea
Comerlati
andreac@dmsa.unipd.it
Bellin, Alberto
Alberto
Bellin
alberto.bellin@ing.unitn.it
Ferronato, Massimiliano
Massimiliano
Ferronato
ferronat@dmsa.unipd.it
Gambolati, Giuseppe
Giuseppe
Gambolati
gambo@dmsa.unipd.it
Putti, Mario
Mario
Putti
putti@dmsa.unipd.it
Teatini, Pietro
Pietro
Teatini
teatini@dmsa.unipd.it
Comerlati, Andrea
Andrea
Comerlati
andreac@dmsa.unipd.it
Stochastic layering effect on the upward migration of anthropogenic CO2 sequestered in saline aquifers.
XVI International Conference on Computational Methods in Water Resources
2006
2006
A widespread concern among the scientific community is the
increase of the greenhouse gas emissions, especially CO2, which may yield an
increase of earth's temperature. To reduce the CO2 released in the
atmosphere an option which is attracting a growing attention is its
sequestration in deep geologic formations. Deep
saline aquifers may offer a great potential for the storage of
large volumes of carbon dioxide.
However, because of the relatively small practical experience with
CO2 disposal in brine formations, more research is needed
to assess the feasibility of the operation.
In particular more studies are needed to identify aquifers
sealed by continuous clay caprock over a regional scale.
For this reason it is important to study the heterogeneous
character of the sealing layers, i.e., the probability of
having small fractures or zones of high permeability in the aquitards.
In this paper we try to evaluate the effects of these potential
heterogeneities on a CO2 sequestration problem.
Aquitard properties are generated using a stochastic approach based
on the binary field generation so that higher permeability inclusions are
produced in the caprock with a given distribution. Montecarlo simulations
are then needed to calculate the probability distribution
of the escape of CO2 through a sequence of aquifer/aquitards
that are representative of the Upper Adriatic system.
Stochastic modeling appears to be a very powerful tool to take into
account in a CO2 sequestration project the degree of continuity
of the sealing aquitards. This issue is of importance
to understand how potential discontinuities in the caprock
can affect the upward migration of the injected carbon dioxide and
to quantitatively assess the risk related to possible CO2
escape to the ground surface.