Electromagnetism is applied in many geophysical methods. The principals of electromagnetic induction are applied in Airborne, surface and borehole logging systems.
Electromagnetic methods include a number of surface geophysical applications. Surface geophysical applications include Frequency Domain systems and Time Domain Systems.
Frequency Domain systems use continuous wave, usually sine wave transmitters. The receiver usually is designed to measure in-phase (I) and quadrature (Q) portions of the signal.
Time Domain systems usually transmit an electromagnetic pulse. The pulse enters the surrounding ground and creates eddy currents in conductors. The Eddy currents in the conductors generate a secondary magnetic field that is measured by receiver electronics.
WELLOG has webpages on this website that are directed toward specific applications related to electromagnetic methods.
An overview of electromagnetic theory follows:
Revised 11-07-2016 © WELLOG ALL RIGHTS RESERVED