Time- and Frequency-Domain Techniques for Measuring the Dielectric Properties of Rocks: A Review

Abstract

AbstractAutomated frequency- and time-domain techniques for measuring the dielectric properties of rocks are discussed. Although emphasis is placed on those methods used in our laboratories, discussion of other work available in the literature is also included. The relative merits and limitations of the frequency- and time-domain techniques are evaluated. Some representative results illustrating the variation of the complex permittivity of oil shale as a function of frequency, temperature, and grade are given. The paper is concluded with the description of an in-situ dielectric probe which utilizes an open-ended section of transmission line as a sample holder. Experimental results illustrating the accuracy of the on-line measurements are presented and suggestions for the future development of the in-situ probe are discussed.