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

Virginia Ann Colten1
Department of Geology, University of Illinois, Urbana, Illinois 61801
1 Present address: Division of Natural Sciences and Mathematics, St. Mary's College of Maryland, St. Mary#x00027;s City, Maryland 20686.

Abstract: 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.

Key Words: Brine • Diagenesis • Hydration • Pressure • Smectite • Temperature

Clays and Clay Minerals; August 1986 v. 34; no. 4; p. 385-389; DOI: 10.1346/CCMN.1986.0340405
© 1986, The Clay Minerals Society
Clay Minerals Society (www.clays.org)