Electrical properties of sand-clay mixtures: the effect of microstructure

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We have performed a series of laboratory experiments on saturated sand-clay mixtures. Measurements include frequency-dependent electrical properties using the four-electrode technique (10 mHz to 1 MHz), permeability, porosity, and acoustic velocities. We mixed clean quartz sand with Na-montmorillonite in a number of different configurations containing 0 to 10% clay: as a dispersed mixture, as discrete clay clusters, and arranged in distinct layers. Solutions of CaCl{sub 2} ranging from 0.0005 N to 0.75 N (0.05 to 64 mS/cm) and deionized water were used as saturating fluids. We found the electrical properties to be dependent on clay content, fluid conductivity, and microstructure ... continued below

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139 Kilobytes pages

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Carlberg, E D; Roberts, J J & Wildenschild, D July 29, 1999.

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Description

We have performed a series of laboratory experiments on saturated sand-clay mixtures. Measurements include frequency-dependent electrical properties using the four-electrode technique (10 mHz to 1 MHz), permeability, porosity, and acoustic velocities. We mixed clean quartz sand with Na-montmorillonite in a number of different configurations containing 0 to 10% clay: as a dispersed mixture, as discrete clay clusters, and arranged in distinct layers. Solutions of CaCl{sub 2} ranging from 0.0005 N to 0.75 N (0.05 to 64 mS/cm) and deionized water were used as saturating fluids. We found the electrical properties to be dependent on clay content, fluid conductivity, and microstructure in a complex fashion. Increasing fluid conductivity and increasing clay content generally resulted in higher electrical conductivity. For an individual sample, two main regions of conduction exist: a region dominated by surface conduction and a region where the ionic strength of the saturating fluid controlled conduction. The sample geometry (dispersed, non-dispersed, or layered clay configuration) was found to greatly affect the magnitude of the surface conductance in the range of low fluid conductivity.

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139 Kilobytes pages

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  • Society of Exploration Geophysicists 1999, Houston, TX (US), 10/31/1999--11/05/1999

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  • Report No.: UCRL-JC-135208
  • Report No.: EW4090100
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 14693
  • Archival Resource Key: ark:/67531/metadc627704

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  • July 29, 1999

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  • June 16, 2015, 7:43 a.m.

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  • May 6, 2016, 1:15 p.m.

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Carlberg, E D; Roberts, J J & Wildenschild, D. Electrical properties of sand-clay mixtures: the effect of microstructure, article, July 29, 1999; California. (digital.library.unt.edu/ark:/67531/metadc627704/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.