Abstract Details

Details of the Abstract

Title of paper Modeling and inversion with semi-airborne electromagnetic method for imaging subsurface structures
List of authors Bayat, M., Ronczka, M., Nazari, S., Rochlitz, R., Guenther, T.
Affiliation(s) LIAG Institute for Applied Geophysics, Hannover, Germany, Maryam.Bayat@leibniz-liag.de
LIAG Institute for Applied Geophysics, Hannover, Germany, Mathias.Ronczka@leibniz-liag.de
LIAG Institute for Applied Geophysics, Hannover, Germany, Saeed.Nazari@leibniz-liag.de
LIAG Institute for Applied Geophysics, Hannover, Germany, Raphael.Rochlitz@leibniz-liag.de
LIAG Institute for Applied Geophysics, Hannover, Germany, Thomas.Guenther@leibniz-liag.de
Summary Electromagnetic surveys can be employed in different ways such as ground-based, airborne, or semi-airborne, each offering unique capabilities for imaging the subsurface. Semi-airborne electromagnetic (sAEM) methods provide a balance between resolution and depth penetration compared to the other two options. They have the advantage of avoiding difficult terrains or rough topographies, such as mountainous regions, forests, and rivers in comparison with ground-based surveys. Another advantage of sAEM is a larger investigation depth due to a stronger source signal and a larger Tx-Rx distance, however, it is limited in terms of covered survey area compared to airborne methods. For creating nuclear waste disposals, subsurface structures like clay layers act as impermeable barriers, affecting fluid flow dynamics and trapping subsurface fluid. Detecting these structures aids in predicting fluid migration and assessing environmental risks. We have studied the electromagnetic response of conductive clay layers and a fault zone by simulating both helicopter and drone surveys with the sAEM method. This study aims to enhance our understanding of the subsurface geology by characterizing a fault structure and delineating clay layers using sAEM. We used the modeling tool custEM to generate synthetic data. After validation of forward models through semi-analytical solutions, inverse models were calculated. The findings indicate that this technique is effective in capturing high-resolution details of near-surface features and investigating deeper subsurface layers.
Session Keyword 6.0 Marine and airbone EM
File upload 6.0_modeling_and_inversion_wi_bayat_06.pdf
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