DIELECTRIC-PERMITTIVITY SPECTRA OF OIL-WATER-SATURATED SAND-CLAYEY ROCKS OF DIFFERENT MINERALOGICAL COMPOSITIONS AND RELAXATION PROPERTIES OF WATER IN THESE ROCKS
P.P. Bobrov1, V.L. Mironov2,3, A.V. Repin1
1Omsk State Pedagogical University, Naberezhnaya im. Tukhachevskogo 14, Omsk, 644099, Russia
2L.V. Kirenskii Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Akademgorodok 50, str. 38, 660036, Russia
3M.F. Reshetnev Siberian State Aerospace University, pr. im. Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk, 660014, Russia
Keywords: Oil-bearing deposits, sand-clayey rocks, dielectric permittivity, conductivity, multifrequency dielectric relaxation
Abstract
Experimental measurements of dielectric permittivity and equivalent conductivity of sand-clayey samples (a mixture of river sand with bentonite or kaolin) saturated with salt-solution-diesel-fuel emulsions were performed in the frequency range from 10 kHz to 1 GHz at temperatures of 25-65° C. It is shown that when the content of the salt solution in the saturating fluid does not exceed 10 %, the dielectric permittivity in the frequency range from 1 MHz to 1 GHz depends little on the mineral composition of the sample and on the concentration of the saturating solution. When the portion of water is 33.3 % or higher, an increase in the concentration of the salt solution leads to an increase in the equivalent conductivity and the real part of the complex dielectric permittivity. Using the refractive model of the complex dielectric permitivity, we have estimated the dielectric properties of bound water, which depend on temperature and the type of clay (bentonite or kaolin) in the sand-clay mixture but are independent of the water saturation and the amount of clay in the sample.
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