Locating microseismic events using multiplicative time-reversal imaging based on decoupled wavefields in VTI media

PreviousNext No AccessSEG 2020 Workshop: 2nd SEG Borehole Geophysics Workshop, Virtual, 26–27 November 2020Locating microseismic events using multiplicative time-reversal imaging based on decoupled wavefields in VTI mediaAuthors: Meng LiHuifeng LiYuhua GuoXiao MengxiongMeng LiXi'an Shiyou UniversitySearch for more papers by this author, Huifeng LiXi'an Shiyou UniversitySearch for more papers by this author, Yuhua GuoXi′an Changqing Technology Engineering Co., LtdSearch for more papers by this author, and Xiao MengxiongBGP Inc., CNPCSearch for more papers by this authorhttps://doi.org/10.1190/bhgp2020-16.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Estimation of microseismic event location is of great significance in unconventional resources development and exploitation with its advantage of imaging the fractures induced by hydraulic fracturing stimulation. Time reversal imaging technique (TRI), which reversely propagates the recorded microseismic energy to refocus to its real location, has been verified as a satisfying method in noisy environment. However, the location images obtained from TRI techniques are frequently smeared with strong imaging noises and artifacts resulting from the cross talk of coupled wave modes coinciding in space and time with sparse measurements especially in heterogeneous anisotropic media, resulting in erroneous location estimations. To mitigate these disturbances, a multiplicative time reversal imaging method based on decoupled wavefields is proposed (DC-MTRI). Wave-mode separators constructed based on Christoffel equation are first utilized to fully separate qP and qSV wavefields at each receiver in VTI media. Multiplicative time reversal imaging condition is then applied to the auto and cross-correlations of decoupled wavefields of each receiver to construct the final location image. The synthetic examples show that the wave-mode separators applied in this paper can fully separate qP and qSV potentials in 2D VTI media compared to Helmholtz decomposition. As a consequence, the proposed method substantially improves the quality of the location image with a much sharper focus and less noisy imaging energy at shallow depth of the sophisticated Sigesbee 2A model. Keywords: microseismic, imaging, polarization, P-wave, modelingPermalink: https://doi.org/10.1190/bhgp2020-16.1FiguresReferencesRelatedDetails SEG 2020 Workshop: 2nd SEG Borehole Geophysics Workshop, Virtual, 26–27 November 2020ISSN (online):2159-6832Copyright: 2020 Pages: 167 publication data© 2020 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 30 Dec 2020 CITATION INFORMATION Meng Li, Huifeng Li, Yuhua Guo, and Xiao Mengxiong, (2020), "Locating microseismic events using multiplicative time-reversal imaging based on decoupled wavefields in VTI media," SEG Global Meeting Abstracts : 57-61. https://doi.org/10.1190/bhgp2020-16.1 Plain-Language Summary KeywordsmicroseismicimagingpolarizationP-wavemodelingPDF DownloadLoading ...