UNIVERSITY OF MADRAS
B.Sc. DEGREE COURSE IN GEOPHYSICS
SEMESTER SYSTEM WITH CREDITS
(Effective from the Academic Year 2003-2004)

SYLLABUS

Semester VI - Paper X - Electrical and Electromagnetic Methods

Duration: 3 hrs
Maximum Marks: 100
Credits: 4

Unit I

Electrical properties of earth material Conductivity of metals, conductivity of electronic semiconductors solid electrolytes, solid conduction in rocks, conduction in water bearing rocks, description of geoelectric section, resistivity, dielectric constant and electric polarization, magnetic permeability - Classification of electrical methods.

Unit II

Resistivity methods - True and Apparent resistivity, units of measurements, homogeneous and anisotropic earth, factors affecting resistivity, single overburden problem, profiling and sounding in resistivity method, DC and AC resistivity meters, collection of field data and interpretation of the profiling and sounding data, Presentation of results, geoelectric section, applications of electrical methods.

Unit III

Spontaneous Polarization methods: Geochemical potentials, electro - kinetic potential, diffusion potential, shale potential, mineralization potential, variations in Spontaneous Ploarization (SP), collection of SP field data, interpretation of SP data, presentation of results.

Unit IV

Electromagnetic methods : induction of electric field, alternating current, theory, eddy currents, advantages of AC methods, real and imaginary field, various coil arrangements, profiling and sounding in induction methods, field procedure for obtaining the data using the Turam and Slingram methods, modelipg in electro magnetic techniques and their use in interpretation of the data - Application of electromagnetic methods.

Unit V

Brief description of the principle, field procedure and application for the charged body method, induced polarization method, equi - potential method.

Books Recommended

Outlines of Geophysical Prospecting - A manual for geologists by Ramachandra Rao, M.B., Prasaranga, University of Mysore, Mysore, 1975.

Exploration Geophysics - An outline by Bhimasankaram V.L.S., Association of Exploration Geophysicists, Osmania University, Hyderabad, 1990.

An introduction to Geophysical Prospecting by Dobrin, MB., MCGraw Hill, New Delhi, 1984.

Applied Geophysics by Telford W.M. Geldart L.P. Sheriff, R.E. and Keys D.A. Oxford and IBH Publishing Co. Pvt. New Delhi. 1976.

Electrical Methods in Geophysicai Prospecting by Keller, G.V.and Frischknecht, F.C. Pergamon Press, New York, 1982.