AIP EFFECTS IN AIRBORNE EM FIXED WING SYSTEMS: A SPECTREM THEORETICAL STUDY
| Autor: | Viezzoli, Andrea, Dauti, Francesco, Nirocca Devkurran, Pitts, Brad |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: | |
| DOI: | 10.5281/zenodo.7687622 |
| Popis: | IP effects can distort airborne EM data, usually producing, faster decays and, under certain conditions, changes in, signal polarity. These effects, if not recognized and, treated with a dispersive resistivity model, often lead to, artefacts in the resistivities recovered. Historically, the IP, effects in fixed-wing AEM systems have been put in the, 'too hard basket'. This was mainly due to their geometric, configuration (and its monitoring) that prevented an, unambiguous relation between negative voltages and IP, effects. Another deterrent was the high ground clearance,, expected to make possible IP effects insignificant. The, rapidly accumulating experience on IP effects in, helicopter EM systems, however, warrants further, research on fixed wing EM and IP. With this work we, therefore investigated the fixed wing EM systems, sensitivity to Induced Polarization effects, presenting, numerical experiments on the SPECTREMPLUS system., We carried out a great number of forward responses,, associated with different combinations of Cole & Cole, parameters in both homogeneous halfspaces and two and, three - layered models. The analysis showed the, SPECTREMPLUS system to be sensitive to the, presence of chargeable material, in several Cole &, Cole parameters domains. These effects vary non, monotonically with resistivity, and become more marked, with variations in the layering, i.e., adding a purely, resistive basement under a shallower chargeable layer., Deep conductors' responses can also be widely affected, by shallow chargeable strata. The result demonstrate that, IP effects are, at times, detectable by the fixed wing EM, systems. As is the case for the helicopter EM systems,, taking IP into consideration during processing and, modelling may increase the accuracy of both data and, derived resistivities. Open-Access Online Publication: March 01, 2023 |
| Databáze: | OpenAIRE |
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