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oa Integrated 3D Modelling of Variable Magnetic Remanence Fields
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Mineral Exploration Symposium, Sep 2020, Volume 2020, p.1 - 3
Abstract
Total Magnetic Intensity (TMI) is a combination of induced and remanent fields. Remanence represents a significant hurdle to TMI interpretation and needs to be addressed to avoid errors. In the cases of transforming TMI into vector components and gradients and 3D integrated forward modelling, allowing for variable vector angles is required. Examples are presented that illustrate the use of variable vector angles for large scale regional survey compilations. Significant improvements to the magnetic forward operator in 3D are presented, as a result of the integration of variable magnetic remanence. An extension to the Intrepid GeoModeller 3D fast Fourier Transform (FFT) methods enables the estimation the total magnetization field in calculating the 3D forward model. Intrepid Geophysics has implemented a range of 2D and 3D operators to more precisely account for the physics of variable vector angles when modelling and interpreting exploration targets from TMI data.