Induced polarization in humid limestone in the radio frequency range and lower

ABSTRACT

Experimental investigations in the laboratory led to a better understanding of the fundamental relationship between rock properties and electrical characteristics. Some fundamental relationships and mechanisms are represented for a quantitative interpretation of the induced polarization data of limestone rock samples, when subjected to humid atmosphere. An equivalent circuit is assumed to identify the diffusion ZD, reaction and adsorption impedances. Limestone rock samples are studied at a frequency range of 102 - 107 Hz and at atmospheric relative humidities between 18%-50%. Abnormal high dielectric Constant and abnormal behavior of the conductivities for the studied samples are observed which are ascribed to electrochemical kinetics