Joint microseismic event location with surface geophones and downhole DAS at the FORGE geothermal site

PreviousNext No AccessFirst International Meeting for Applied Geoscience & Energy Expanded AbstractsJoint microseismic event location with surface geophones and downhole DAS at the FORGE geothermal siteAuthors: Gary BinderZagid AbatchevGary BinderAutomated Seismics LLCSearch for more papers by this author and Zagid AbatchevAutomated Seismics LLCSearch for more papers by this authorhttps://doi.org/10.1190/segam2021-3583892.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractAll methods for microseismic data acquisition, such as surface geophone arrays, downhole geophone arrays, and now distributed acoustic sensing (DAS), have trade-offs in the accuracy of event location. Surface geophone arrays can localize events well in 3D but suffer from high noise levels. Downhole geophones have lower noise but have a smaller aperture and may be challenging to deploy in harsh borehole conditions. DAS can densely cover the entire well, but only measures one component of strain, causing circular event location ambiguities. Here we demonstrate an approach to integrate data from a surface geophone array and downhole DAS via a GPU-accelerated source scanning algorithm for joint microseismic event location. Using data from the Frontier Observatory for Research in Geothermal Energy (FORGE) in Utah, we illustrate how the integrated data can resolve the circular location ambiguity of DAS and decrease the depth uncertainty of the surface array. In the future, joint analysis of surface and DAS data may enable an affordable alternative to downhole geophones for high-resolution microseismic monitoring.Keywords: microseismic, integration, DAS (distributed acoustic sensors), geothermal, passive acquisitionPermalink: https://doi.org/10.1190/segam2021-3583892.1FiguresReferencesRelatedDetails First International Meeting for Applied Geoscience & Energy Expanded AbstractsISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2021 Pages: 3561 publication data© 2021 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 01 Sep 2021 CITATION INFORMATION Gary Binder and Zagid Abatchev, (2021), "Joint microseismic event location with surface geophones and downhole DAS at the FORGE geothermal site," SEG Technical Program Expanded Abstracts : 2001-2005. https://doi.org/10.1190/segam2021-3583892.1 Plain-Language Summary KeywordsmicroseismicintegrationDAS (distributed acoustic sensors)geothermalpassive acquisitionPDF DownloadLoading ...