Which one of the following geophysical methods is most suitable for exploration of possible hydrocarbon bearing sediments underlying the Deccan Traps Gate geology and geophysics 2014

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Which one of the following geophysical methods is most suitable for exploration of possible hydrocarbon-bearing sediments underlying the Deccan Traps? (-Gate geology and geophysics 2014)

(A) Seismic 
(B) Magnetotellurics 
(C) DC resistivity 
(D) Airborne EM


By:Aparna-Dasgupta

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the following geophysical methods is most suitable for exploration of possible hydrocarbon-bearing sediments underlying the Deccan Traps
(B) Magnetotellurics 
Magnetotellurics (MT) refers to a technique in which electrical resistivity is determined by making measurements of electric and magnetic fields related to naturally occurring currents (“tellurics”, caused mostly by lightning strikes) flowing in the ground. Typical MT frequencies are from 0.0005 Hz to 1,000 Hz. The ratio of the amplitudes of the electric and magnetic fields is used to calculate the electrical resistivity of the ground at a depth determined by the ground resistivity and the frequency of the measured signal. Higher ground resistivity and lower frequencies allow greater depth of investigation. For traditional low-frequency MT, typical depth of investigation is up to 20 km or greater, but generally targets within the first 100 meters cannot be resolved.


Amogh

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