Time-dependent velocity behavior of clay-bearing sandstone in laboratory measurements: Frio sandstone, onshore oilfield, Texas, USA

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2018Time-dependent velocity behavior of clay-bearing sandstone in laboratory measurements: Frio sandstone, onshore oilfield, Texas, USAAuthors: Aijiro ShigematsuAyato KatoNaoyuki ShimodaLevi KnappFumio KonoTakafumi SakashitaTsukuru HashimotoAijiro ShigematsuJapan Oil, Gas and Metals National CorporationSearch for more papers by this author, Ayato KatoJapan Oil, Gas and Metals National CorporationSearch for more papers by this author, Naoyuki ShimodaJapan Oil, Gas and Metals National CorporationSearch for more papers by this author, Levi KnappJapan Oil, Gas and Metals National CorporationSearch for more papers by this author, Fumio KonoJapan Oil, Gas and Metals National CorporationSearch for more papers by this author, Takafumi SakashitaJapan Oil, Gas and Metals National CorporationSearch for more papers by this author, and Tsukuru HashimotoJX Nippon Oil & Gas Exploration CorporationSearch for more papers by this authorhttps://doi.org/10.1190/segam2018-2995186.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Measuring pressure-dependency of velocity is one of the most essential parts of rock physics modelling and subsequent time-lapse seismic modelling which attempt to predict seismic response in different pressure conditions. This analysis is important because it is believed to be the only accurate way to obtain site-specific velocity pressure-dependency information. In our rock physics study, as a part of the seismic monitoring feasibility study for an onshore oilfield in Texas, it was observed that the measured velocity under confining pressure slowly increased over a period of 2 or more hours. The increase in velocity was not negligible considering precise estimation of pressure-dependency need to predict time-lapse seismic response over a narrow range of EOR-induced reservoir pressure changes. Therefore, it was necessary to treat and understand this time-dependent behavior properly. At 3 of the pressure steps, pressure was held constantly for 2 hours to record multiple measurements. This data was used to perform a stable-velocity correction for the velocity measurements at other pressure steps. Our interpretation is that the velocity increase over time is related to clays at the contacts of framework grains. This analysis will allow for a more accurate and reliable rock physics model and subsequent time-lapse seismic models. Presentation Date: Wednesday, October 17, 2018 Start Time: 9:20:00 AM Location: Poster Station 16 Presentation Type: Poster Keywords: rock core laboratory measurements, rock physics, sandstone, viscoelastic, monitoringPermalink: https://doi.org/10.1190/segam2018-2995186.1FiguresReferencesRelatedDetails SEG Technical Program Expanded Abstracts 2018ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2018 Pages: 5520 publication data© 2018 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 27 Aug 2018 CITATION INFORMATION Aijiro Shigematsu, Ayato Kato, Naoyuki Shimoda, Levi Knapp, Fumio Kono, Takafumi Sakashita, and Tsukuru Hashimoto, (2018), "Time-dependent velocity behavior of clay-bearing sandstone in laboratory measurements: Frio sandstone, onshore oilfield, Texas, USA," SEG Technical Program Expanded Abstracts : 3729-3733. https://doi.org/10.1190/segam2018-2995186.1 Plain-Language Summary Keywordsrock core laboratory measurementsrock physicssandstoneviscoelasticmonitoringPDF DownloadLoading ...