Home – Home – Jornals – Russian Geology and Geophysics 2018 number Неопубликованное

Unique relationships between the parameters of induced polarization (IP) and the structure of interphase and pore space of rocks provide high interest to applied science — ensures continuous expansion of the scope of the method. The physico-chemical theory of the phenomenon of IP rocks has gaps. This is due to the complex nature of the processes that occur in rocks and produced secondary electric fields. Laboratory studies continue to be the main source of new knowledge about the mechanisms and processes occurring in rocks when an electric field is applied. In recent decades, several new hypotheses, models, and mechanisms of IP for rocks with electron-conducting mineral (EM) inclusions have been proposed. The paper describes the key features of IP mechanisms. These mechanisms are actively discussed and used to interpret IP data collected in the laboratory and field. This paper presents the results of an experimental laboratory study on the IP of interface "shungite-porous moisture", conducted on a synthetic model of rock with EM inclusions. Based on voltametric measurements, we have identified the main characteristics of shungite's polarization in an aqueous NaCl solution. An estimate is given of the magnitude of exchange currents, the dynamics of polarization at the interphase boundary at different current densities, and the relaxation of the surface electric potential. For the first time, we present measurements of electric currents flowing in the model and within the shungite inclusion - the IP currents. It has been proven that the relaxation of the electric field in the model and the IP currents have identical dependencies. The proportionality between the polarization magnitude of shungite inclusions and the normal current component on the interface between shungite and moisture has been experimentally verified. The data obtained and published suggest that the mechanism of electrode polarization of EM inclusions in rocks plays a significant role. A probable mechanism for polarization of the interphase "EM-pore moisture" in rocks has been presented.