Abstract

Mapping very weak and subtle magnetic anomalies associated with sedimentary formations, such as those within the Western Canada Sedimentary Basin (WCSB), called for the development of an ultrahigh-resolution three-component magnetic gradient system. Scintrex Survey and Exploration Technologies' 3D-GM was an attempt at developing a high-precision, helicopter-towed, three-component magnetic gradient bird, combining the benefits of measured gradients with low sensor ground clearance. Fugro Airborne Surveys' Heli-Triax system is a redesign of the 3D-GM platform addressing some hardware and other limitations of the older system. Both platforms were used to fly a combined total of eight test surveys and 15 proprietary surveys within the WCSB.

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