Calibrating anisotropic-velocity models using VFSA: Application to Vaca Muerta Formation

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2018Calibrating anisotropic-velocity models using VFSA: Application to Vaca Muerta FormationAuthors: Daniel O. PérezSoledad R. LagosDanilo R. VelisJuan C. SoldoDaniel O. Pérezformerly CONICET and Y-TEC; presently FCAG-UNLPSearch for more papers by this author, Soledad R. LagosFacultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata (FCAG-UNLP) and CONICETSearch for more papers by this author, Danilo R. VelisFacultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata (FCAG-UNLP) and CONICETSearch for more papers by this author, and Juan C. Soldoformerly YPF Tecnología S.A. (Y-TEC); presently YPFSearch for more papers by this authorhttps://doi.org/10.1190/segam2018-2989258.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract We provide well-calibrated VTI velocity models useful to locate microseismic events in the Vaca Muerta shale formation, Neuquén, Argentina. Assuming layered models with weak anisotropy, we make use of the information provided by well logs and perforation shots of known position to estimate the layer velocities, depths and anisotropy. This leads to a constrained nonlinear inverse problem that consists in minimizing the discrepancies between the observed and calculated P and S-wave arrival time differences. To avoid local minima and other convergence issues, we minimize the resulting objective function using very fast simulated annealing (VFSA). We test the proposed strategy on field data and estimate a set of velocity models that honor the observed data, which we validate carrying out a simulated microseismic event location. The results show that the proposed strategy is capable of estimating layered VTI velocity models suitable to accurately locate microseismic events during a hydraulic stimulation in the Vaca Muerta shale formation. This paper was accepted into the Technical Program but was not presented at the 2018 SEG Annual Meeting in Anaheim, California. Keywords: microseismic, VTI, algorithm, South America, unconventionalPermalink: https://doi.org/10.1190/segam2018-2989258.1FiguresReferencesRelatedDetails 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 Daniel O. Pérez, Soledad R. Lagos, Danilo R. Velis, and Juan C. Soldo, (2018), "Calibrating anisotropic-velocity models using VFSA: Application to Vaca Muerta Formation," SEG Technical Program Expanded Abstracts : 3042-3046. https://doi.org/10.1190/segam2018-2989258.1 Plain-Language Summary KeywordsmicroseismicVTIalgorithmSouth AmericaunconventionalPDF DownloadLoading ...