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A Staggered Approach to Extract Remanent Magnetization from Magnetization Vector Inversions Using an Active SourceNormal access

Authors: M. Queitsch, M. Schiffler, R. Stolz and N. Kukowski
Event name: 80th EAGE Conference and Exhibition 2018
Session: Poster: Near Surface - Electrical and EM Methods, incl GPR A
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201800952
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 7.55Mb )
Price: € 20

Summary:
Measuring local perturbations of the Earth’s magnetic field is one of the most successful methods in geophysical exploration, even though it has an inherent ambiguity. In order to avoid misinterpretations, more and more interpreters gravitate towards techniques that allow including not only induced, but also remanent magnetization in the modelling process. One of today’s common approaches is magnetization vector inversion (MVI), which has been successfully applied on many data sets with very promising results. The application of vectorial-type magnetometers or gradiometers such as full tensor magnetic gradiometery (FTMG) systems based on Superconducting Quantum Interference Devices (SQUID), provides additional directional information, which are very useful, in particular in the MVIs. Independent information, e.g. magnetic susceptibility is still necessary in order to perform a reliable separation of the magnetization types. The application of electromagnetic methods, e.g. frequency domain electromagnetics (FDEM) allows to gain independend information on magnetic susceptibility. Here, we combine different approaches, i.e. dc-resistivity (electrical resistivity tomography, ERT), FDEM and FTMG measurements, in order to produce robust subsurface models. This staggered work flow is tested on a small study site in the West Eifel Volcanic field in Germany, where a basaltic lava flow is investigated


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