Details of the Abstract
| Title of paper |
Multi-source 3D imaging of a graphite deposit combining drone-based semi-airborne and ground-based electromagnetics |
| List of authors | Mörbe, W., Rochlitz, R., Kotowski, P., Tezkan, B., Yogeshwar, P. |
| Affiliation(s) |
University of Cologne, Institute of Geophysics and Meteorology, Cologne, Germany, moerbe@geo.uni-koeln.de, Leibniz-Institute of Applied Geophysics (LIAG), Hannover, Germany, University of Münster, Institute of Geophysics, Germany, University of Cologne, Institute of Geophysics and Meteorology, Cologne, Germany University of Cologne, Institute of Geophysics and Meteorology, Cologne, Germany |
| Summary |
The transition towards renewable energies demands secure supply with critical raw material and requires efficient non-invasive methods for deep earth resources exploration. The novel DESMEX (Deep electromagnetic sounding for mineral exploration) semi-airborne electromagnetic (semi-AEM) concept aims at efficient exploration of resources down to roughly 1 km depth. Here we present an exploration study combining ground-based controlled source electromagnetics (CSEM) with drone-based semi-AEM in a graphite mining district in eastern Bavaria, Germany. On the ground, several horizontal electrical dipole transmitters were deployed, utilizing a rectangular current function with a base frequency between 1 Hz and 12 Hz. Drone-based magnetic field sensors measure the EM field on flight-lines with dense spacing and within several overlapping flight areas, providing a fast data acquisition and a high spatial coverage. As sensors, a three-component induction coil triple and a total-field magnetometer was utilized. In addition, multi-component magnetic as well as electric field measurements on a 3D grid were conducted on the ground, adding complementary information to the drone-based data set. Here, we present the concept and obtained results from the conducted survey, including an overview over the obtained transfer functions and preliminary 3D inversion results. We compare the overall performance and resolution of ground-based and drone-based semi-AEM data. Imaged shallow high conductivity structures can be correlated with graphite-rich zones and match well with existing helicopter-borne EM results. |
| Session Keyword | 3.0 EM methods for exploration (geothermal, mineral resources, etc.) |
| File upload |
3.0_multi-source_3d_imaging_o_morbe_01.pdf
|