Premium
LABORATORY INSTRUMENTATION TO STUDY CHANGES OF ELECTRICAL CONDUCTIVITY OF ROCKS WITH CHANGES OF FREQUENCY, TEMPERATURE AND PRESSURE *
Author(s) -
LOSITO G.,
FINZICONTINI G.
Publication year - 1981
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1981.tb01035.x
Subject(s) - instrumentation (computer programming) , geothermal gradient , calibration , electrical resistivity and conductivity , measuring instrument , geology , igneous petrology , mineralogy , economic geology , regional geology , pressure measurement , temperature measurement , remote sensing , hydrogeology , geophysics , geotechnical engineering , electrical engineering , engineering geology , mechanical engineering , metamorphic petrology , engineering , thermodynamics , physics , computer science , volcanism , seismology , tectonics , quantum mechanics , operating system
A bstract A laboratory instrument was developed to investigate the electrical properties of rock samples with respect to changes of frequency, temperature and pressure. The instrument can be used to obtain general trends and typical values for geological media. It should be of particular interest in geothermal studies and research in the geophysical properties of rocks. The design intervals for quantities under investigation were 20–300°C, 10 5 ‐4 × 10 7 Pa and 5 × 10 −4 ‐10 3 Hz. Certain limitations exist on the simultaneous use of the highest values of temperature and pressure. The main features of the instrument are: analog electrical outputs recorded by an x‐y recorder or observed on a scope with an attached camera (according to the frequency range); pressures produced by an oil hydraulic system in order to ensure electrical insulation of the sample; temperatures obtained by placing the pressure vessel into a thermostatically controlled room. Thus the monitoring instrumentation is directly accessible during the experiment. Information is also given about calibration procedures and examples of rock sample data are given.