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Collaborating Authors
Results
ABSTRACT I describe the preliminary results of ongoing research on the implementation of a magnetic inversion exploiting a novel positivity constraint and a nonlinear algorithm for the optimization. Inversion is performed into the magnetization domain and not into the susceptibility domain directly. Furthermore, I propose an effective way to integrate magnetic data with refraction tomography data through simultaneous joint inversion (SJI) with the cross-gradients constraint. Application of this method to synthetic data sets demonstrates the benefits of using SJI with respect to separate, single-domain inversions. As for seismic-gravity SJI, a seismic-magnetic SJI is effective for complex imaging problems, such as regions with intrusions or faults.
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling > Seismic Inversion (1.00)
- Geophysics > Magnetic Surveying (1.00)
Using ERA Low Frequency E-field Profiling And UBC 3D Frequency-domain Inversion to Delineate And Discover a Mineralized Zone In Porcupine District, Ontario, Canada.
Kaminski, Vlad (University of British Columbia) | Prikhodko, Alexander (Geotech, Ltd) | Oldenburg, Douglas (University of British Columbia)
ABSTRACT A low-frequency resistivity survey using ERA electrical profiling (middle gradient array) has been completed over a nickel prospect in Porcupine District, Ontario, Canada. The results of this EM-Resistivity were used to calculate the apparent resistivity and were further inverted using UBC-GIF 3D Frequency Domain Inversion Software, EH3DInv. The results of the inversion have shown the anomalous distribution of electrical properties, consistent with a known geological contact between metavolcanic rocks and an ultramafic pluton. The conductive zone has been interpreted to be located in the interval between 70 and 120 meters. The interpreted conductive zone was further subjected for a drilling program. The drilling program was carried out in March–April 2011 and revealed a 21m thick zone with disseminated to massive mineralized intervals starting at 82 meters, which is consistent with the results of 3D inversion of ERA data.
- North America > Canada > Ontario (0.89)
- North America > Canada > British Columbia > Metro Vancouver Regional District > Vancouver (0.15)
- Materials > Metals & Mining (1.00)
- Energy > Oil & Gas > Upstream (1.00)