![]() ![]() This behavior is characteristic of percolation and illustrates the importance ofĬomponent microgeometry. At higher clay contents, clay is the load-bearing material and conductivity shows little sensitivity to clay content. For instance, in suites of sand-clay mixtures at low confining pressure,Ĭonductivity increases dramatically as clay volume fraction increases from 0.00 to about 0.20 this is due to clay packets forming critical conductive paths through the sand framework. Results show that electrical properties depend upon volumetric, geometric and electrochemical factors, and that the relative importance of these factors changes with frequency. Crossplots and petrophysical modeling are used to investigate the relationships between the various electrical and hydrogeologic parameters. Conductivity values range fromġ.8x10⁻⁷ S/m (dry quartz sand, 100 kHz) to 1.0x10⁻² S/m (water-saturated kaolinite, 10 MHz), and dielectric constant values range from 1.9 (dry kaolinite, 10 MHz) to 200 (dry ![]() For each mixture, measurements were made of effective electrical conductivity δ and dielectricĬonstant K over the frequency range 100 kHz to 10 MHz. Water saturation was varied by imbibition and evaporative drying. Compaction was simulated by packing different amounts of the same material into the sample holder. Different lithologies were simulated by varying the relative proportion of sand and clay in the Sand, clay, air and water were used to systematically vary porosity (0.24 to 0.80), clay content (0.00 to 1.00), permeability (5.4x10⁻¹² to 4.4x10⁻⁶ cm²) and water saturation (0.00 to 1.00). DETERMINING E0 FROM RELATIVE PERMEABILITY PHYSICS 101 SERIESA series of laboratory experiments was conducted to investigate relationships between electrical properties and hydrogeologic properties of unlithified geologic materials. ![]()
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