True 3D modeling of land controlled source EM

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2020True 3D modeling of land controlled source EMAuthors: Randall MackieWolfgang SoyerFederico MiorelliVerena SchifanoStephen HallinanRandall MackieCGG Geoscience Multi-Physics ImagingSearch for more papers by this author, Wolfgang SoyerCGG Geoscience Multi-Physics ImagingSearch for more papers by this author, Federico MiorelliCGG Geoscience Multi-Physics ImagingSearch for more papers by this author, Verena SchifanoCGG Geoscience Multi-Physics ImagingEOST, University of StrasbourgSearch for more papers by this author, and Stephen HallinanCGG Geoscience Multi-Physics ImagingSearch for more papers by this authorhttps://doi.org/10.1190/segam2020-3427957.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractControlled source audio magnetotellurics “CSAMT” is a grounded electromagnetic imaging technique used primarily in the mining industry, and is a closely related predecessor to the marine controlled source electromagnetic method “CSEM” more familiar to the oil and gas community. Both methods involve injecting alternating electric current into the Earth through long transmitter dipoles, and making measurements of the Earth’s response at an array of EM receivers. Historically, CSAMT data have been interpreted using readily available MT modeling algorithms, but this means using only the data considered far enough away from the dipole source to be interpretable using the MT-inherent assumption of a uniform, or “far-field”, source. In this work, we show the advantages of carrying out complete earth, three-dimensional modeling of all grounded dipole EM fields, including those near the source, and avoiding the commonly employed, ad-hoc methods that throw away otherwise valuable “near-field” data that are unusable in MT-only modeling workflows.Note: This paper was accepted into the Technical Program but was not presented at the 2020 SEG Annual Meeting.Keywords: 3D, CSEM, resistivityPermalink: https://doi.org/10.1190/segam2020-3427957.1FiguresReferencesRelatedDetailsCited byGeothermal Exploration in the Burwash Landing Region, Canada, Using Three-Dimensional Inversion of Passive Electromagnetic Data25 November 2022 | Remote Sensing, Vol. 14, No. 23 SEG Technical Program Expanded Abstracts 2020ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2020 Pages: 3887 publication data© 2020 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 30 Sep 2020 CITATION INFORMATION Randall Mackie, Wolfgang Soyer, Federico Miorelli, Verena Schifano, and Stephen Hallinan, (2020), "True 3D modeling of land controlled source EM," SEG Technical Program Expanded Abstracts : 1394-1398. https://doi.org/10.1190/segam2020-3427957.1 Plain-Language Summary Keywords3DCSEMresistivityPDF DownloadLoading ...