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Permeability impairment of a limestone reservoir triggered by heterogeneous dissolution and particles migration during CO 2 ‐rich injection
Author(s) -
Mangane Papa O.,
Gouze Philippe,
Luquot Linda
Publication year - 2013
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/grl.50595
Subject(s) - dissolution , calcite , permeability (electromagnetism) , porosity , microporous material , clogging , mineralogy , geology , porous medium , materials science , chemical engineering , chemistry , composite material , geotechnical engineering , biochemistry , archaeology , membrane , engineering , history
A CO 2 ‐rich brine core‐flood experiment in calcite limestone for conditions representative of underground storage ( P = 12 MPa and T = 100°C) was performed in order to explore the dissolution mechanisms arising at moderate CO 2 partial pressure (0.3 MPa). An increase of the total porosity ( φ T ) accompanied by a persistent permeability ( k ) decrease was measured. The mechanisms controlling this atypical anticorrelated k − φ T relationship were investigated from the analysis of high‐resolution X‐ray microtomography images of the sample acquired before and after the experiment. All the evidences converge to the conclusion that the ubiquitous decrease of permeability measured during the 44 h of dissolution is due to the clogging of a fraction of the macroporosity by microporous material triggered by the rearrangement of the detached undissolved particles. This mechanism results in the development of low permeability zones bridging the macroporosity.