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• W2016017353 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2004Processing of monopole compressional in slow formationAuthors: H. P. ValeroL. PengM. YamamotoT. PlonaD. MurrayH. YamamotoH. P. ValeroSchlumberger Oilfield ServicesSearch for more papers by this author, L. PengSchlumberger Oilfield ServicesSearch for more papers by this author, M. YamamotoSchlumberger Oilfield ServicesSearch for more papers by this author, T. PlonaSchlumberger Oilfield ServicesSearch for more papers by this author, D. MurraySchlumberger Oilfield ServicesSearch for more papers by this author, and H. YamamotoSchlumberger Oilfield ServicesSearch for more papers by this authorhttps://doi.org/10.1190/1.1851269 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Slowness time coherence (STC) processing (Kimball and Marzetta, 1984), is a robust and reliable technique to obtain the slowness of the formation from an array of sonic waveforms. The processing is robust automatic and provides easy evaluation of arrivals across an array of sonic waveforms. Nevertheless, in some instances, if the wave propagation is complex, the usual evaluation procedures used in the processing may lead to erroneous results. An example is very slow formations, in which the compressional wave can be as slow as, or even slower than, the mud in the borehole. In this case, the main component of the monopole waveforms is a borehole mode, dispersive, which propagates at the mud slowness. The compressional head wave vanishes because the energy is refracted away. Under these circumstances, when using conventional procedures, the compressional slowness log reads the mud slowness in slow intervals. Therefore, improved processing to extract the compressional slowness of the formation is required. In this paper a methodology is presented to obtain the compressional slowness of a slow formation. The first part of this processing consists of correcting the dispersion of the borehole mode to obtain the low‐frequency asymptote corresponding to the compressional slowness of the formation. Simultaneously, the waveforms are filtered using an optimal bandpass filter, which is based on a sensitivity analysis. Examples involving actual datasets demonstrate the efficiency of the new processing.Permalink: https://doi.org/10.1190/1.1851269FiguresReferencesRelatedDetailsCited ByEstimation of borehole fluid slowness using sonic array waveformsHenri‐Pierre Valero, Hugues Djikpesse, and Bikash Sinha14 October 2009Probabilistic mud slowness estimation from sonic array dataA data‐driven approach to extract shear and compressional slowness from dispersive waveform dataXiaojun Huang and Hezhu Yin7 December 2005 SEG Technical Program Expanded Abstracts 2004ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2004 Pages: 2586 publication data© 2004 Copyright © 2004 Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 03 Jan 2005 CITATION INFORMATION H. P. Valero, L. Peng, M. Yamamoto, T. Plona, D. Murray, and H. Yamamoto, (2004), Processing of monopole compressional in slow formation, SEG Technical Program Expanded Abstracts : 318-321. https://doi.org/10.1190/1.1851269 Plain-Language Summary PDF DownloadLoading ..." @default.
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