Mapping the salt structures from magnetic and gravity gradiometry data in Nordkapp Basin, Barents Sea

Abstract

PreviousNext No AccessFirst International Meeting for Applied Geoscience & Energy Expanded AbstractsMapping the salt structures from magnetic and gravity gradiometry data in Nordkapp Basin, Barents SeaAuthors: Mo TaoMichael JorgensenMichael S. ZhdanovMo TaoConsortium for Electromagnetic Modeling and Inversion, University of Utah, and TechnoImagingSearch for more papers by this author, Michael JorgensenConsortium for Electromagnetic Modeling and Inversion, University of Utah, and TechnoImagingSearch for more papers by this author, and Michael S. ZhdanovConsortium for Electromagnetic Modeling and Inversion, University of Utah, and TechnoImagingSearch for more papers by this authorhttps://doi.org/10.1190/segam2021-3583664.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractAccurate interpretation of salt structures plays an important role in hydrocarbon exploration. Over the years, several methods have been applied to mapping salt structures, including seismic, gravity and magnetic. The gravity and magnetic methods in particular have the advantages of low cost, efficiency, and ability to map the salt flanks and base of the salt, which are critical in oil and gas exploration. The salt diapirs are characterized by diamagnetic properties which makes a standard magnetic inversion for susceptibility difficult to apply. In this paper, we apply a recently developed method of total magnetic intensity (TMI) data inversion for magnetization vector instead of susceptibility. The magnetization vector can change its orientation within the inversion domain, thus indicating different types of magnetic properties of the rocks. The 3D inversion for magnetization vector, however, becomes very complicated due to the increased non-uniqueness of the inverse problem. To address this ambiguity, we use a joint inversion of gradiometry and TMI data based on a joint focusing stabilizer. This novel approach is illustrated by the case study of mapping the sea-bottom salt structures in the Nordkapp Basin of Barents Sea.Keywords: inversion, gradiometry, magnetization, imaging, 3DPermalink: https://doi.org/10.1190/segam2021-3583664.1FiguresReferencesRelatedDetails First International Meeting for Applied Geoscience & Energy Expanded AbstractsISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2021 Pages: 3561 publication data© 2021 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 01 Sep 2021 CITATION INFORMATION Mo Tao, Michael Jorgensen, and Michael S. Zhdanov, (2021), "Mapping the salt structures from magnetic and gravity gradiometry data in Nordkapp Basin, Barents Sea," SEG Technical Program Expanded Abstracts : 874-878. https://doi.org/10.1190/segam2021-3583664.1 Plain-Language Summary Keywordsinversiongradiometrymagnetizationimaging3DPDF DownloadLoading ...