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Victorian Branch Technical night: Integration of geological uncertainty into geophysical inversion by means of local gradient regularization

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Event Date

Thursday, February 21, 2019

Event Location

Event Address

The Kelvin Club, 14-30 Melbourne Place Melbourne, 3000, VIC

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Event Details

You are cordially invited to our first technical meeting of the year to be held on 21st of February 2019, at the Kelvin Club from 6 pm.  We will have the pleasure in welcoming Jeremie Giraud from the University of Western Australia who will present his research on " Integration of geological uncertainty into geophysical inversion by means of local gradient regularization"



We introduce a workflow integrating geological modelling uncertainty information to constrain gravity inversions. We test and apply this approach to the Yerrida Basin (Western Australia), where we focus on prospective greenstone belts beneath sedimentary cover. Geological uncertainty information is extracted from the results of a probabilistic geological modelling process using geological field data and their inferred accuracy as inputs. The uncertainty information is utilized to locally adjust the weights of a minimum-structure gradient-based regularization function constraining geophysical inversion. Our results demonstrate that this technique allows geophysical inversion to update the model preferentially in geologically less certain areas. It also indicates that inverted models are consistent with both the probabilistic geological model and geophysical data of the area, reducing interpretation uncertainty. The interpretation of inverted models reveals that the recovered greenstone belts may be shallower and thinner than previously thought.



Jérémie studied physics and geosciences at undergraduate level in Grenoble and obtained his MSc. Eng. (geophysics) in Strasbourg (France). Various internships have led him to Canada and Germany working on hydrogeophysics and magnetotellurics in research institutes and on reservoir mapping for industry. He then worked for Schlumberger for about three years where he focussed on reservoir appraisal and characterization using geophysical integration techniques. He was based in Milan, Italy and trained mostly in Houston before moving to Perth to start his PhD at the Centre for Exploration Targeting (Uni. of WA), focusing on multidisciplinary geophysical integration. Jérémie submitted his thesis in September 2018 and is now involved in the MinEx CRC and Loop consortia.


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