Magnetic gradients in sedimentary basins: Examples from the Western Canada Sedimentary Basin

摘要

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-preci-sion, 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.