Azimuthal response and shear wave splitting of 9-component shear waves for the fracture zones in a tight sand reservoir

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2019Azimuthal response and shear wave splitting of 9-component shear waves for the fracture zones in a tight sand reservoirAuthors: Jiwei ChengFeng ZhangPeng WangXiang Yang LiLin WangJiwei ChengState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing)Search for more papers by this author, Feng ZhangState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing)Search for more papers by this author, Peng WangState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing)Search for more papers by this author, Xiang Yang LiState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing) and British Geological Survey, The Lyell Centre, Research Avenue South, Edinburgh EH14 4AP, UKSearch for more papers by this author, and Lin WangState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing)Search for more papers by this authorhttps://doi.org/10.1190/segam2019-3206101.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract9-component (9-C) seismic data can provide more reservoir information than that of 1-C and 3-C, and processing 9-C S-wave data is no more difficult than processing conventional single-component P-wave data. In this paper, we design a realistic geologic model of the fracture zone for the tight-sandstone gas reservoir formation in Upper Triassic formation, and study the azimuthal seismic response and shear wave splitting of 9-C seismic data for the fracture zones. Elastic stiffness coefficients are calculated using real logs based on Hudson’s theory and Gassmann fluid substitution, and the reflectivity method is used for seismic forward modelling. The analysis results show that AVOA (amplitude versus offset and azimuth) is generally more sensitive than TVOA (time versus offset and azimuth) to fracture properties, and SV-SV and SH-SH wave can be more robust than P-P and P-SV wave in determining fracture orientation: AVOA of SV-SV and SH-SH wave could indicate fracture orientation at near offset (offset-depth ratio or ODR=0.4). Compared with P-SV and SH-SH wave, SV-SV wave is more sensitive to the change of anisotropy parameter caused by fluid substitution. Shear wave splitting analysis shows that SV-SV wave and SH-SH wave are more robust than P-SV wave in estimating fracture parameters for weak anisotropy and low signal-to-noise ratio. This investigation reveals the significance and feasibility of using 9-C shear wave data in fracture characterization.Presentation Date: Monday, September 16, 2019Session Start Time: 1:50 PMPresentation Time: 1:50 PMLocation: 225CPresentation Type: OralKeywords: multicomponent, anisotropy, shear wave (S-wave), fluid, fracturesPermalink: https://doi.org/10.1190/segam2019-3206101.1FiguresReferencesRelatedDetailsCited bySeismic Amplitude Inversion for Orthorhombic Media Based on a Modified Reflection Coefficient Approximation4 July 2022 | Surveys in Geophysics, Vol. 43, No. 5 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 Jiwei Cheng, Feng Zhang, Peng Wang, Xiang Yang Li, and Lin Wang, (2019), "Azimuthal response and shear wave splitting of 9-component shear waves for the fracture zones in a tight sand reservoir," SEG Technical Program Expanded Abstracts : 2684-2689. https://doi.org/10.1190/segam2019-3206101.1 Plain-Language Summary Keywordsmulticomponentanisotropyshear wave (S-wave)fluidfracturesPDF DownloadLoading ...