Illuminating Santos Basin’s pre-salt with OBN data: Potential and challenges of FWI

Abstract

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2019Illuminating Santos Basin's pre-salt with OBN data: Potential and challenges of FWIAuthors: Florian JounoAdriano MartinezDenis FerreiraDaniela DonnoAdel KhalilFlorian JounoCGG, Adriano MartinezCGG, Denis FerreiraCGG, Daniela DonnoCGG, and Adel KhalilCGGhttps://doi.org/10.1190/segam2019-3215027.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractOver the last ten years, Santos Basin has become one of the most prospective oil provinces in the world. Multiple giant pre-salt oil and gas fields have been discovered. Due to the geological complexity of this basin, ocean-bottom-node (OBN) acquisition has naturally emerged as an imaging solution. Besides imaging, the full-azimuth and long-offset from OBN data are ideal for full-waveform inversion (FWI), particularly the recently-developed time-lag FWI (TLFWI) formulation, which provides an approach suitable for the complex geologies of the Santos Basin. We show herein that given the right data, provided by OBN acquisition, a reliable FWI engine such as TLFWI, and a good starting model, we are able to derive a velocity model with enough resolution to impact the imaging of salt and pre-salt regions. This offers a significant improvement compared to models derived from narrow-azimuth (NAZ) streamer data. However, some challenges remain. FWI is highly dependent on the initial velocity model, due to the difficulty of recording reliable extra low frequencies. Multi-parameter FWI anisotropy update also continues to be a complicated task, as decoupling velocity from the anisotropy term remains arduous. Overcoming these challenges is not a trivial task. Better acquisitions together with multi-parameter FWI may help for solving these challenges.Presentation Date: Tuesday, September 17, 2019Session Start Time: 1:50 PMPresentation Time: 3:30 PMLocation: 302BPresentation Type: OralKeywords: full-waveform inversion, ocean-bottom node, salt, South America, subsaltPermalink: https://doi.org/10.1190/segam2019-3215027.1FiguresReferencesRelatedDetailsCited byFull-waveform inversion of a Brazilian presalt ocean-bottom node data set using a concentric circle source geometryEdwin Fagua Duarte, Danyelle da Silva, Pedro Tiago Carvalho, João Medeiros de Araújo, and Jorge L. Lopez4 January 2023 | GEOPHYSICS, Vol. 88, No. 1Tupi Nodes pilot: A successful 4D seismic case for Brazilian presalt reservoirsNathalia Martinho Cruz, José Marcelo Cruz, Leonardo Márcio Teixeira, Mônica Muzzette da Costa, Laryssa Beatriz de Oliveira, Eduardo Naomitsu Urasaki, Thais Pontes Bispo, Manoel de Sá Jardim, Marcos Hexsel Grochau, and Alexandre Maul1 December 2021 | The Leading Edge, Vol. 40, No. 12Assessment of Water Saturation Using Dielectric Permittivity Measurements in Formations with Complex Pore Structure: Application to the Core- and Log- Scale Domains15 September 2021Multiscale q-FWI applied to circular shot OBN acquisition for accurate presalt velocity estimatesSérgio Luiz E. F. da Silva, Jorge L. Lopez, João M. de Araújo, and Gilberto Corso1 September 2021The first high-end OBC imaging for fractured basement in Bohai Bay, ChinaJianfeng Zhang, Zhiliang Wang, Yitao Chen, Yonghe Guo, Zhi Kang Fong, Jiang Li, and Yao Wu1 September 2021The potential of sparse nodes for exploration in Santos BasinAdriano Martinez, Adel Khalil, Werter Oliveira, Eduardo Naomitsu, and Ana Moliterno30 September 2020 SEG Technical Program Expanded Abstracts 2019ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2019 Pages: 5407 publication data© 2019 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 10 Aug 2019 CITATION INFORMATION Florian Jouno, Adriano Martinez, Denis Ferreira, Daniela Donno, and Adel Khalil, (2019), "Illuminating Santos Basin's pre-salt with OBN data: Potential and challenges of FWI," SEG Technical Program Expanded Abstracts : 1345-1349. https://doi.org/10.1190/segam2019-3215027.1 Plain-Language Summary Keywordsfull-waveform inversionocean-bottom nodesaltSouth AmericasubsaltPDF DownloadLoading ...