DLP Webinar: Magnetic Inversion into Induced and Remanent Magnetisation to Identify Geothermal and Lithium Resources: Energy Transition Strategies

Webinar details
Instructor:   Dr Michael Jorgensen 
Duration:   40 min include Q&A
Main topics:  

Simultaneous 3D inversion of susceptibility (corrected

for remanence) and remanent magnetisation
Language:  English

Next Delivery: 26 May 2026, 9AM CEST

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Description

Conventional magnetic inversion workflows typically assume that subsurface magnetization is dominated by induced effects aligned with the present-day geomagnetic field. However, in many geological environments—particularly those involving igneous, metamorphic, or hydrothermally altered rocks—remanent magnetisation can be significant and may dominate the magnetic response. Neglecting this component can lead to misinterpretation of source geometry, depth, and physical properties. This lecture introduces Magnetic Inversion into Induced and Remanent Magnetisation (MINREM), a simultaneous 3D inversion framework designed to recover both scalar susceptibility (corrected for remanent effects) and the full vector remanent magnetisation. The approach addresses the non-uniqueness inherent in magnetic inversion by jointly estimating induced and remanent contributions, enabling more physically consistent subsurface models. This technology was jointly developed by TechnoImaging and the Consortium for EM Modeling and Inversion (CEMI) at the University of Utah. Key aspects of the methodology include formulation of the inverse problem, treatment of vector magnetisation, and strategies for stabilizing the solution in large-scale problems. The talk will also highlight implementation considerations relevant to high-resolution airborne magnetic datasets, including computational scalability and model parameterization. Applications of MINREM to mineral exploration and geothermal systems will be presented, demonstrating how resolving remanent magnetization improves structural interpretation, enhances targeting of alteration zones, and reduces ambiguity in complex geological settings.

Participant profile

 Exploration geophysicists (magnetics specialists)  Geophysical inversion researchers  Airborne geophysics practitioners

About Instructor

Dr. Michael Jorgensen is a geophysicist at TechnoImaging and an Adjunct Assistant Professor with the Consortium for EM Modeling and Inversion at the University of Utah. His research centers on advanced inversion of magnetic and multiphysics data, with emphasis on recovering remanent magnetisation and susceptibility models corrected for remanence effects. He develops large- scale 3D inversion methods for potential-field data sets with millions of data points and model parameters, leveraging GPU acceleration, moving-footprint approaches, and massively parallel computation. A key focus is deterministic joint inversion of magnetic, gravity, and electromagnetic data using Gramian- based coupling and joint focusing constraints to reduce non-uniqueness. Applications target mineral exploration problems—particularly gold, lithium, and uranium—where magnetite destruction, alteration, and basement structure are expressed through complex induced and remanent magnetisation signatures, as well as geothermal systems including Yellowstone and Dixie Valley.