CGG’S New Helitem-C AEM Systems

Abstract

Recent development and re-design of the Helitem helicopter time domain system have resulted in the release of the Helitem30C and Helitem35C systems, both of which employ MultiPulse™. We describe the Helitem30C system, which was designed for efficient operation and is applicable to the majority of TEM surveys. The Helitem35C was designed to increase sensitivity to both resistive and conductive targets (increased geologic bandwidth) while achieving maximum power (and depth). A redesigned receiver suspension system significantly reduces coil motion at low frequencies, allowing for 12.5/15 Hz operation with no increase in coil motion noise, important for exploring under cover. We show case histories using both systems to illustrate their performance.