Frequency dependence of permittivity and conductivity of reservoir rocks

The frequency dispersion analysis is important for the development and application of dielectric logging and ground-penetrating radar methods in remote sounding of soils and rocks in a micro wave range. This study focuses on frequency dispersion of permittivity and conductivity in sandstone and limestone in a frequency range from 120 Hz to 200 kHz. It is found that frequency dependence of permittivity and conductivity in sandstone shows up in the whole frequency range being tested. In sandstone, the permittivity decreased from the value of 165.5±72.3 at 120 Hz to 19.3±2.9 at 200 kHz, and conductivity changed from 0.45±0.39 µS/m at 120 Hz to 235.4±144.7 µS/m at 200 kHz. In limestone, these values changed in a narrower range. The permittivity in limestone was 5.85±0.48 at 120 Hz and 5.41±0.34 at 5 kHz. In the range of 5–200 kHz, these values remain practically unchanged. Since the main type of polarizing of heterogeneous media which have effect on the frequency dependence of electric properties is the Maxwell–Wagner–Sillars interfacial polarization, the dispersion of permittivity and conductivity shows up stronger in sandstone being a more nonuniform rock type than limestone.

Gapeev A. A., Cherepetskaya E. B., Kudinov I. A., Semenov Ya. G., Vasilevykh V. V. Frequency dependence of permittivity and conductivity of reservoir rocks. MIAB. Mining Inf. Anal. Bull. 2024;(9):117-128. [In Russ]. DOI: 10.25018/0236_1493_2024_9_ 0_117.

A.A. Gapeev¹, Graduate Student, e-mail: agapeev@misis.ru, ORCID ID: 0009-0001-7744-9426,
E.B. Cherepetskaya¹, Dr. Sci. (Eng.), Professor, e-mail: echerepetskaya@mail.ru, ORCID ID: 0000-0002-9642-21492,
I.A. Kudinov¹, Research Project Engineer, e-mail: igor@optoacoustic.ru,
Ya.G. Semenov¹, Laboratory Assistant, e-mail: y@48.org, ORCID ID: 0000-0003-0313-2714,
V.V. Vasilevykh¹, Laboratory Assistant, e-mail: vova398777@gmail.com, ORCID ID: 0000-0001-8128-0531,
¹ NUST MISIS, 119049, Moscow, Russia.

A.A. Gapeev, e-mail: agapeev@misis.ru.

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