Estimating uncertainty for surface nuclear magnetic resonance water content and relaxation time soundings

Abstract

PreviousNext No AccessNear-Surface Asia Pacific Conference, Waikoloa, Hawaii, 7-10 July 2015Estimating uncertainty for surface nuclear magnetic resonance water content and relaxation time soundingsAuthors: Andrew D. Parsekian*Denys GrombacherAndrew D. Parsekian*University of WyomingSearch for more papers by this author and Denys GrombacherStanford UniversitySearch for more papers by this authorhttps://doi.org/10.1190/nsapc2015-086 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Ambient electromagnetic noise presents a major challenge for surface nuclear magnetic resonance (NMR) measurements. In this study, we investigate an approach to estimate uncertainty in surface NMR water content and relaxation times utilizing resampling statistics. We use forward modeled synthetic data under various noise levels to demonstrate that a bootstrap resampling of the synthetic data reproduces an uncertainty estimate that closely reconstructs the “known uncertainty.” We also show example field data measured under different magnitude noise levels illustrating the result of our analysis under noise conditions that may be typically encountered in the field. The bootstrapping approach for estimating uncertainty is a computationally expensive brute-force strategy, but it is straightforward to implement and produces valuable uncertainty estimates for both water content and T2* relaxation time results for smooth surface NMR sounding models. Keywords: nuclear magnetic resonance, waterPermalink: https://doi.org/10.1190/nsapc2015-086FiguresReferencesRelatedDetails Near-Surface Asia Pacific Conference, Waikoloa, Hawaii, 7-10 July 2015ISSN (online):2159-6832Copyright: 2015 Pages: 501 publication data© 2015 Published in electronic format with permission by the Society of Exploration Geophysicists, Australian Society of Exploration Geophysicists, Chinese Geophysical Society, Korean Society of Earth and Exploration Geophysicists, and Society of Exploration Geophysicists of JapanPublisher:Society of Exploration Geophysicists HistoryPublished Online: 10 Jul 2015 CITATION INFORMATION Andrew D. Parsekian* and Denys Grombacher, (2015), "Estimating uncertainty for surface nuclear magnetic resonance water content and relaxation time soundings," SEG Global Meeting Abstracts : 328-330. https://doi.org/10.1190/nsapc2015-086 Plain-Language Summary Keywordsnuclear magnetic resonancewaterPDF DownloadLoading ...