Geophysics: Electromagnetic Methods (GPh3202)

Active (controlled source) methods and Passive (natural field) methods

Electrical conductivity (resistivity) of the Earth's materials

The distance between the transmitter and receiver coils is directly proportional to the depth range under investigation

<p>Mapping, profiling, and sounding</p> Signup and view all the answers

<p>The ground conductivity and operating frequency have an inverse relationship</p> Signup and view all the answers

<p>The level of inquiry is closely correlated with the loop size, recording time interval, and shut-off time.</p> Signup and view all the answers

<p>The process of induction does not require direct contact with the ground.</p> Signup and view all the answers

<p>EM surveys counter survey difficulties with land models that have very conductive uppermost layers, whereas resistivity surveys counter difficulties with models that have very resistive uppermost layers.</p> Signup and view all the answers

<p>EM methods have a greater penetrating depth than electric methods.</p> Signup and view all the answers

<p>Applications include mineral resource assessment and exploration, investigating and monitoring hydrocarbon reserves, surveys of groundwater, and more.</p> Signup and view all the answers