Mixing-induced dissolution in fingering reactive flow

Mixing-induced dissolution in fingering reactive flow

Ponencia presentada en la European Geosciences Union General Assembly, celebrada en Viena del 27 de abril al 2 de mayo de 2014.

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Main Authors: Hidalgo, Juan J., Cabeza, Yoar, Dentz, Marco, Carrera, Jesús
Format: comunicación de congreso biblioteca
Language:English
Published: European Geosciences Union 2014
Online Access:http://hdl.handle.net/10261/97095
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spelling dig-idaea-es-10261-970952020-07-09T10:00:33Z Mixing-induced dissolution in fingering reactive flow Hidalgo, Juan J. Cabeza, Yoar Dentz, Marco Carrera, Jesús Ponencia presentada en la European Geosciences Union General Assembly, celebrada en Viena del 27 de abril al 2 de mayo de 2014. The evolution of porosity in carbonate reservoirs during CO2 injection, and the wormhole formation in karst aquifers can be attributed to fast equilibrium reactions, which are characterized by large Damköhler numbers. Under these conditions the reaction rate is mixing-controlled, and can be quantified in terms of the mixing rate of the conservative components of the chemical system [De Simoni et al. (2005), Water. Resour. Res.]. Here, we study the calcite dissolution during the convective-driven mixing of CO2 in a carbonate saline aquifer. The CO2-brine mixture is denser than the two initial fluids, leading to a Rayleigh-Bénard-type instability known as convective mixing, which greatly accelerates CO2 dissolution. The dissolution front can display a stable or fingering shape depending on the relation of the governing forces. We explore the feedback between fluid instabilites, porosity evolution, and permeability changes by means of numerical simulations of a CO2 stationary layer dissolving into brine using an analogue-fluid system with a nonmonotonic density-concentration curve [Neufeld et al. (2010), Geophys. Res. Lett.; Backhaus, et al. (2011), Phys. Rev. Lett.; Hidalgo et al. (2013), Adv. Water Resour.]. We derive an analytical expresion for the speciation contribution to the reaction rate which is valid under a wide range of reservoir conditions (pH< 8:3). This allows us to analyze systematically the impact of conservative mixing mechanisms on the dynamics of the complex reactive flow system. Our findings show how the developed porosity patterns depend on the fingering instabilities caused by the convective-driven dissolution of the CO2, the movement of the receding CO2-brine interface, and the properties of the chemical system. Peer reviewed 2014-05-22T10:49:51Z 2014-05-22T10:49:51Z 2014 comunicación de congreso http://purl.org/coar/resource_type/c_5794 EGU General Assembly (2013) http://hdl.handle.net/10261/97095 en #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/FP7/282900 Publisher's version open European Geosciences Union
institution IDAEA ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-idaea-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del IDAEA España
language English
description Ponencia presentada en la European Geosciences Union General Assembly, celebrada en Viena del 27 de abril al 2 de mayo de 2014.
format comunicación de congreso
author Hidalgo, Juan J.
Cabeza, Yoar
Dentz, Marco
Carrera, Jesús
spellingShingle Hidalgo, Juan J.
Cabeza, Yoar
Dentz, Marco
Carrera, Jesús
Mixing-induced dissolution in fingering reactive flow
author_facet Hidalgo, Juan J.
Cabeza, Yoar
Dentz, Marco
Carrera, Jesús
author_sort Hidalgo, Juan J.
title Mixing-induced dissolution in fingering reactive flow
title_short Mixing-induced dissolution in fingering reactive flow
title_full Mixing-induced dissolution in fingering reactive flow
title_fullStr Mixing-induced dissolution in fingering reactive flow
title_full_unstemmed Mixing-induced dissolution in fingering reactive flow
title_sort mixing-induced dissolution in fingering reactive flow
publisher European Geosciences Union
publishDate 2014
url http://hdl.handle.net/10261/97095
work_keys_str_mv AT hidalgojuanj mixinginduceddissolutioninfingeringreactiveflow
AT cabezayoar mixinginduceddissolutioninfingeringreactiveflow
AT dentzmarco mixinginduceddissolutioninfingeringreactiveflow
AT carrerajesus mixinginduceddissolutioninfingeringreactiveflow
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