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Experimental verification of advanced SNMR modeling
IRD Institut de Recherche pour le Developpement, Paris.
BRGM, Orleans.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
IRD/UJF-Grenoble-1/CNRS/G-INP-UMR LTHE, Grenoble.
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2014 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Whatever would be the practical implementation of Surface Nuclear Magnetic Resonance (SNMR) survey, inversion is based on forward modeling of the magnetic resonance response. Consequently, the mathematical model is a crucial point for inversion. We have developed advanced mathematical model that allows computing magnetic resonance signal from 3D targets both in FID (free induction decay) and SE (spin echo) modes. This model takes into account both time and lateral variations of the earth's magnetic field, water temperature and electrical resistivity of the subsurface but also the effect of magnetic rocks on MRS signal. For experimental verification of the modeling routine we used two bulk water reservoirs. One-dimensional (1-D) measurements were performed in winter from the ice surface in the Baltic Sea (Sweden) and 3-D verification was made using an artificial water pool located in the southern part of the New Caledonia Island. Modeling was carried out taking into account reservoir geometry and local conditions obtained from independent measurements. We have found a good correspondence between observed and theoretical signals for both FID and SE measurements. At our knowledge, SNMR modeling was never compared with field data obtained under all mentioned above conditions

Place, publisher, year, edition, pages
2014.
National Category
Geophysics
Research subject
Applied Geophysics
Identifiers
URN: urn:nbn:se:ltu:diva-27454Local ID: 0e87ec22-03fa-4b19-ba37-a5eed9a309d7OAI: oai:DiVA.org:ltu-27454DiVA, id: diva2:1000638
Conference
Near surface geoscience : 19th European Meeting of Environmental and Engineering Geophysics of the Near Surface Geoscience Division of EAGE 09/09/2013 - 11/09/2013
Note
Godkänd; 2014; 20140416 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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  • apa
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