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Hydration States of Smectite in NaCl Brines at Elevated Pressures and Temperatures

Published online by Cambridge University Press:  02 April 2024

Virginia Ann Colten
Virginia Ann Colten*
Affiliation:
Department of Geology, University of Illinois, Urbana, Illinois 61801
*
1Present address: Division of Natural Sciences and Mathematics, St. Mary's College of Maryland, St. Mary's City, Maryland 20686.
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Abstract

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A high-pressure, high-temperature cell was used to monitor the basal X-ray powder diffraction spacing of Na-saturated Cheto montmorillonite in contact with NaCl solutions at temperatures as high as 200°C and hydraulic pressures as high as 6700 psi (456 bar). The 003 and 005 reflections were used to determine d(001) of the smectite. The montmorillonite, in 1 molal NaCl, exhibited a d(001) of 15.4 Å at room temperature and pressure and a d(001) of 15.6–15.7 Å under 500–2200 psi hydraulic pressure. The basal spacing of the clay in 5 molal NaCl was 15.2 Å and 15.33–15.45 Å at 1 bar and 750–6700 psi (53–456 bar), respectively. Because no changes in the basal spacing with increasing temperature to 200°C were detected in any of the experiments, this Na-smectite probably exists as a two-water-layer complex under diagenetic conditions.

Keywords

BrineDiagenesisHydrationPressureSmectiteTemperature
Type
Research Article
Information
Clays and Clay Minerals , Volume 34 , Issue 4 , August 1986 , pp. 385 - 389
Copyright
Copyright © 1986, The Clay Minerals Society

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