volume | PIER Journals

Abstract

The results of experimental measurements of the complex dielectric permittivity (CDP) of powders of quartz granules with different sizes saturated with water and salt solution of weak concentration are given in the frequency band from 20 kHz to 1 GHz. It is shown that at values of saturation level from 0.6 to 0.9 the relaxation phenomena caused by interfacial polarization on the water-air bound can be observed. The result shows considerable reduction of attenuation in gradually saturated rocks, which allows for deeper sensing during georadar mapping. It is determined that in the dielectric relaxation band and at frequencies below it the hysteresis of the real part of the CDP and equivalent specific conductivity can be observed. Its character significantly depends on the sizes of granules. It is shown that the behavior of CDP and attenuation of an electromagnetic wave at frequencies from 0.1 to 10 MHz complicatedly depends on the sizes of granules, saturation level, salinity of the saturating solution and saturation history.

1. Bobrov, P. P., V. L. Mironov, and A. V. Repin, "Dielectric permittivity spectra of oil-water-saturated sandy-clayey rocks of different mineralogical compositions and relaxation properties of water in these rocks," Russian Geology and Geophysics, Vol. 56, No. 7, 1065-1073, 2015.
doi:10.1016/j.rgg.2015.06.007 Google Scholar

2. Wagner, N., T. Bore, J.-C. Robinet, D. Coelho, F. Taillade, and S. Delepine-Lesoille, "Dielectric relaxation behavior of Callovo-Oxfordian clay rock: A hydraulic-mechanical-electromagnetic coupling approach," J. Geophys. Res. Solid Earth, Vol. 118, 4729-4744, 2013.
doi:10.1002/jgrb.50343 Google Scholar

3. Anderson, W. G., "Wettability literature survey - Part 2: Wettability measurement," Journal of Petroleum Technology, 1246-1262, 1986. Google Scholar

4. Longeron, D. G., M. J. Argaud, and J. P. Feraud, "Effect of overburden pressure and the nature and microscopic distribution of fluids on electrical properties of rock samples," SPE Format, Eval. 4, 194-202, 1989. Google Scholar

5. Knight, R. J. and A. Nur, "Geometrical effects in the dielectric response of partially saturated sandstones," Log Anal., Vol. 28, 513-519, 1987. Google Scholar

6. Knight, R., "Hysteresis in the electrical resistivity of partially saturated sandstones," Geophysics, Vol. 56, No. 12, 2139-2147, 1991.
doi:10.1190/1.1443028 Google Scholar

7. Plug, W. J., E. C. Slob, J. Bruining, and L. M. M. Tirado, "Simultaneous measurement of hysteresis in capillary pressure and electric permittivity for multiphase flow through porous media," Geophysics, Vol. 72, A41-A45, 2007.
doi:10.1190/1.2714684 Google Scholar

8. Belyaeva, T. A., P. P. Bobrov, O. V. Kondratyeva, and A. V. Repin, "Dielectric properties of capillary-meniscus soil water," Earth Research from Space, No. 3, 55-64, 2011 (in Russian). Google Scholar

9. Kavian, M., E. C. Slob, and W. A. Mulder, "Measured electric responses of unconsolidated layered and brine-saturated sand and sand-clay packs under continuous fluid flow conditions," Journal of Applied Geophysics, Vol. 80, 83-90, 2012.
doi:10.1016/j.jappgeo.2012.01.012 Google Scholar

10. Bobrov, P. P., A. V. Repin, and O. V. Rodionova, "Wideband frequency domain method of soil dielectric properties measurements," IEEE Trans. on Geoscience and Remote Sensing, Vol. 53, No. 5, 2366-2372, 2015.
doi:10.1109/TGRS.2014.2359092 Google Scholar

11. Bobrov, P. P., A. S. Lapina, and A. V. Repin, "Effect of the rock/water/air interaction on the complex dielectric permittivity and electromagnetic waves attenuation in water-saturated sandstones," PIERS Proceedings, 1877-1880, Prague, July 6-9, 2015. Google Scholar

12. Mavko, G., T. Mukerji, and J. Dvorkin, "Tools for seismic analysis of porous media," The Rock Physics Handbook, 2nd Edition, Cambridge University Press, Cambridge CB2 8RU, UK, 2009. Google Scholar

Ms. Anastasiya Sergeevna Lapina

Dr. Pavel Petrovich Bobrov