DOWN HOLE ELECTROMAGNETICS

DHEM is a state‐of‐the‐art method for exploring conductive mineralization in depth. Its most significant advantages are increasing the investigation radius of mechanical holes, identifying new targets, better characterizing the intersected conductors and clarifying drillholes missed targets. It is carried out by placing an energizing transmitting loop, in which a square wave is transmitted for an impulse response system. A sensitive receiver probe is then lowered into the borehole, where it records time-series measurements of the three orthogonal components of the electromagnetic field. These logs allow a directional study of the EM response on each station. Given the fact that the receiver is close to deep target conductors, DHEM has greater detection capabilities and provides greater spatial resolution in comparison with airborne and ground EM.