CO2 storage

Since 2000, the Geosciences Department is involved in studies on CO2 geological storage. One of the strongest points of the department is the coupled modelling of hydrodynamics and geochemistry of the evolution and the impacts of a CO2 storage. These models enable to simulate the interactions between formation water, gases and minerals that constitute the rock, also by taking into account the evolution of hydrodynamic properties of rocks under the effect of the chemical degradation. Thus, simulations of CO2 massive injection into different types of deep saline aquifers have been made to highlight the processes that govern CO2 retention or transport. The integrity of storage locations is also preponderant in works achieved : tightness of covering clayey rocks, possible degradation of their properties due to chemical reactions with CO2, corrosion of access wells and sealing cement. Finally, the recent development of analysis methods for taking into account the spatial variability (porosity, permeability, concentrations, ...) and its influence on the response of systems has opened new perspectives for a more realistic modelling of these complex geological systems.

On the other hand, an experimental programme on the reactivity of supercritical CO2 on pure minerals (supported by EdF and the Ile-de-France region) has been developed. Pure minerals are placed in contact with supercritical CO2 and with controlled amounts of initial water in reaction cells kept as they are in pressure and temperature. Several additional analysis techniques enable to identify and quantify the reactions : pressure and temperature control, micro-sampler coupled with a chromatograph, post-mortem analysis with X-ray diffraction and scanning electron microscope. The information collected are used in models of fundamental, thermodynamic, kinetic and phenomenological data.  

CO2-1CO2-2
Modelling of calcite dissolution by CO2-charged water : influence of the spatial variability (porosity, permeability, concentrations)Experimental study of portlandite reactivity in the presence of supercritical CO2


References

●  ACI changement climatique et risques naturels, 2002-2004

●  R2DS, IdF: expériences intégrité de couvertures (CG, CEP)

●  Géocarbone intégrité, ANR 2005-2008

●   Gaz annexes, ANR 2006-2010

●   Total, Projet Maîtrise des gaz résiduels

●   EdF R&D

●  Collaborations: IPGP, Universités de Nancy, Pau, Lille

 Theses

 ●  Aurélien PIPART, DESS/IPGP (September 2003) : "reservoir" modelling.

●   Catherine NOIRIEL, ENSMP/U Montp (November 2005) : carbonate dissolution on CO2 injection

●   Marco DE LUCIA, ENSMP/U Bologne (September 2007) : impact of heterogeneities in Chemistry-Transport coupled modelling

●   Olivier REGNAULT, ENSMP (January 2008) : carbonatation of pure minerals by CO2 (sc)

●   Nadine NEUVILLE, IFP/GEM (2008) : carbonatation of well bottom cement