Assessment of the permeability and pore size of quartz-based consolidated sedimentary rocks by dielectric spectroscopy in the frequency range of 1 kHz - 500 MHz

Бобров, П. П.; Golikov, N. A.; Kroshka, E. S.; Repin, A. V.

doi:10.1016/j.jappgeo.2022.104750

Cited by 3 publications

(1 citation statement)

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“…The physical origin of the marked relaxation, observed for all unsaturated materials at lower water contents (Figure 4), between the regular logarithmic decrease and the highfrequency-independent limit, is not yet explained. It has been observed by other authors (Bobrov et al, 2022;Niu et al, 2020) for sandstones and suggests a possible semi-permeable membrane effect. This remains an important issue which will be the objective of future works in the (100 Hz-10 MHz) frequencies.…”

Section: Discussionsupporting

confidence: 71%

Experimental and numerical analysis of dielectric polarization effects in near‐surface earth materials in the 100 Hz–10 MHz frequency range: First interpretation paths

Tabbagh,

Souffaché,

Jougnot

et al. 2024

Near Surface Geophysics

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SummaryThe recent developments of electromagnetic induction and electrostatic prospection devices dedicated to critical zone surveys in both rural and urban contexts necessitate improving the interpretation of electrical properties through complementary laboratory studies. In a first interpretation step, the various experimental results obtained in the 100 Hz–10 MHz frequency range can be empirically fitted by a simple six‐term formula. It allows the reproduction of the logarithmic decrease of the real component of the effective relative permittivity and its corresponding imaginary component, the part associated with the direct current conductivity, one Cole–Cole relaxation and the real and imaginary components of the high‐frequency relative permittivity. For elucidating physical phenomena contributing to both the logarithmic decrease and the observed Cole–Cole relaxation, we first consider the Maxwell–Wagner–Sillars polarization. Using the method of moments, we establish that this continuous medium approach can reproduce a large range of relaxation characteristics. At the microscopic scale, the possible role of the rotation of the water molecules bound to solid grains is then investigated. In this case, contrary to the Maxwell–Wagner–Sillars approach, the relaxation parameters do not depend on the external medium properties.

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Section: Discussionsupporting

confidence: 71%