GEOTEM

GEOTEM System Specifications

A proven time-domain EM system of successful survey operations worldwide.

The original GEOTEM system was introduced on a Casa 212 aircraft in 1985 as a digital enhancement of the successful INPUT system. Through operating experience worldwide and a continuing series of upgrades and new technology, GEOTEM has become a standard of excellence for fixed-wing electromagnetic (FWEM). It is the product of years of experience in time-domain electromagnetic acquisition, processing and interpretation and exemplifies the dedication of Fugro Airborne Surveys to continuing research in this field.

GEOTEM developments over this period that have led the industry and are now industry standards include:

• Measurement in the receiver bird of three orthogonal components of the secondary EM field (two horizontal directions and one vertical).
• Recording of both B-field and dB/dT response data.
• Lower transmitted waveform frequencies of 12.5, 15, 25, and 30 hertz.
• Measurements during the on-time as well as the off-time of the transmitter pulse.
• Interpretation aids such as energy envelope, conductivity-depth sections, realisable resistive limit maps and stationary current images (SCI).

Fugro Airborne Surveys operates three GEOTEM aircraft out of bases in Perth, Australia and Ottawa, Canada. However, these systems have operated on five continents, in just about every climate and geological/geographical environment. Survey targets have ranged from mineral deposits and petroleum reservoirs to groundwater resources.