Magnetic Sweet Spot Depth Estimation

Aeromagnetic surveys flown across Australia to map a geology largely buried beneath cover and deep weathering have uniform data coverage across the survey areas. However. the information content in the mapped magnetic field is far from uniform due to the highly variable and localised distribution of magnetization. We can only estimate depth to magnetization at the location of suitable magnetization contrasts. We call these locations and the data that define them ‘sweet-spots’. Magnetic source depth estimation requires an assumption of shape for the magnetization and we have developed parametric inversion techniques using bodies of horizontal top and sharp edges to optimise recovery of depth estimates from sweet-spots.