Experimental research of complex permittivity of granite and limestone in dry and water-saturated state

The research investigated dispersion of complex permittivity in samples of granite and limestone at the frequencies to 200 kHz in dry and water-saturated state. The results prove that the highest dispersion of the real and complex parts of complex permittivity takes place in a frequency range from 120 Hz to 10 kHz in the dry samples of both rock types. This is connected with relaxation of polarization in heterogeneous media. The difference in porosity of the granite samples just by 0.07% resulted in the increase in the real part of complex permittivity by 15%. The water-saturated samples demonstrate an increase in the complex part of complex permittivity in a frequency range from 120 Hz to 1 kHz by several orders of magnitude depending on the porosity. Dispersion of both parts of complex permittivity is minimal in a frequency range from 10 to 200 kHz both in dry and water-saturated samples. However, when pores are filled with a fluid, the value of each part of complex permittivity increases by several times. Specific electric conductivity of the dry samples of granite and limestone reaches its maximum at the frequency of 200 kHz, and is less than 10 µS/m in the samples of granite and is about 25 µS/m in the samples of limestone irrespective of porosity. After saturation of the samples with water, specific electric conductivity increases to 200 µS/m at the porosity of 1% in the granite samples and to 2200 µS/m at the porosity of 25% in the limestone samples.

Gapeev A. A. Experimental research of complex permittivity of granite and limestone in dry and water-saturated state. MIAB. Mining Inf. Anal. Bull. 2025;(1):114-127. [In Russ]. DOI: 10.25018/0236_1493_2025_1_0_114.

A.A. Gapeev, Graduate Student, NUST MISIS, 119049, Moscow, Russia, e-mail: artgapeev@yandex.ru, ORCID ID: 0009-0001-7744-9426.

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