EFFECT OF TEMPERATURE, NATURE AND CONCENTRATION OF SALINE AQUEOUS SOLUTIONS ON PERMEABILITY OF SANDSTONES
Two different samples called Ireland sandstone and Vogesian sandstone were submitted to several percolations by saline aqueous solutions of different concentrations and at different temperatures. The initial pressure was adjusted in such a way that the initial water flux passing through the samples was for all the same (10 cm**3/hour for a section of 4 cm diameter). It seems clear that the permeability coefficient decreases when the ionic strength of the solution diminishes and when the temperature increases. At this stage of the investigations, the nature of the cation seems to play an important role on the cation exchange reaction and on the state of floculation or dispersion of the clay minerals. At low temperature, sodium favorizes dispersion and calcium floculation. At high temperature, the contrary is observed. Finally, the major factor which seems to regulate the permeability of sandstone is the physicochemical aggregation or dispersion of clay minerals but also, and maybe mainly, the way that clay plasma is organized and attached to the quartz skeleton of the sandstone.
Bibliographic Reference: EUR 8766 FR (1983) MF, 95P., BFR 120, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989122031800 / Last updated on: 1987-01-01
Available languages: fr