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Polish Academy of Sciences

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Ph. Gouze

Université Montpellier 2 (FR)

Recent publications
1.  Wojtacki K., Lewandowska J., Gouze Ph., Lipkowski A., Numerical computations of rock dissolution and geomechanical effects for CO2 geological storage, INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, ISSN: 0363-9061, DOI: 10.1002/nag.2316, Vol.39, pp.482-506, 2015

Abstract:
The paper is motivated by the long-term safety analysis of the CO2 geological storage. We present a methodology for the assessment of the geomechanical impact of progressive rock dissolution. The method is based on the use of X-ray tomography and the numerical dissolution technique. The influence of evolution of the microstructure on the macroscopic properties of the rock is analysed by using periodic homogenization method. The numerical computations show progressive degradation of all components of the stiffness (orthotropic) tensor. Moreover, the evolution of associated mass transfer properties (as tortuosity and conductivity tensors), by using the periodic homogenization method, is also calculated. The correlation between the mechanical parameters and the transfer properties during the dissolution process is presented. The results show that the highest increase of the hydraulic conductivity (in direction Y) is not associated with the highest decrease of Young modulus in this direction. Moreover, the highest decrease of Young modulus (in the direction X) is not associated with percolation in this direction. Finally, an incremental law to calculate settlement, in case of a rock with evolving microstructure, is proposed. The solution of the macroscopic settlement problem under constant stress and drained conditions showed that the geomechanical effects of the rock dissolution are rather limited.

Keywords:
CO2 storage, homogenization, chemo-mechanical coupling, microstructure, X-ray tomography, numerical computations

Affiliations:
Wojtacki K. - other affiliation
Lewandowska J. - Université Montpellier 2 (FR)
Gouze Ph. - Université Montpellier 2 (FR)
Lipkowski A. - Gdańsk University of Technology (PL)

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