Hydraulic Injection‐Induced Velocity Changes Revealed by Surface Wave Coda and Polarization Data at a Shale Play Site in Southwest China

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dc.citation.articleNumbere2019JB019169en_US
dc.citation.issueNumber10en_US
dc.citation.journalTitleJournal of Geophysical Research: Solid Earthen_US
dc.citation.volumeNumber125en_US
dc.contributor.authorZhang, Yanen_US
dc.contributor.authorNiu, Fenglinen_US
dc.contributor.authorTao, Kaien_US
dc.contributor.authorNing, Jieyuanen_US
dc.contributor.authorChen, Haichaoen_US
dc.contributor.authorTang, Youcaien_US
dc.date.accessioned2020-11-16T19:16:56Zen_US
dc.date.available2020-11-16T19:16:56Zen_US
dc.date.issued2020en_US
dc.description.abstractWe investigated temporal variations of seismic wave velocity associated with hydraulic fracturing using Green's functions computed from ambient noise data. In October and November of 2014, we set up a broadband array at a shale play site inside the Sichuan basin where a pilot horizontal drilling and hydraulic injections were conducted. We first computed cross‐correlation functions using continuous data recorded by 21 three‐component broadband sensors deployed around the treatment well. We then employed a running window correlation‐based coda wave interferometry technique to measure apparent velocity changes from the daily Green's functions of all the station pairs in the frequency range of 1 to 3 Hz. We found significant velocity changes right after the hydraulic fracturing, which exhibited a clear direction‐dependent pattern. S wave velocity along raypaths parallel to the well trajectory showed a clear increase while those perpendicular exhibited a small decrease. The anisotropic changes in seismic velocity observed here were also confirmed from surface wave horizontal particle motion data. By comparing our observations with normal stress changes calculated with a half‐space elastic model, we speculate that stress changes induced by the hydraulic fracturing were likely to be responsible for the observed anisotropic changes in seismic velocity. Our results suggest that time‐lapse seismic imaging with ambient noise data provides a promising probe for monitoring geomechanical changes related to exploitation of unconventional oil and gas resources.en_US
dc.identifier.citationZhang, Yan, Niu, Fenglin, Tao, Kai, et al.. "Hydraulic Injection‐Induced Velocity Changes Revealed by Surface Wave Coda and Polarization Data at a Shale Play Site in Southwest China." <i>Journal of Geophysical Research: Solid Earth,</i> 125, no. 10 (2020) Wiley: https://doi.org/10.1029/2019JB019169.en_US
dc.identifier.doihttps://doi.org/10.1029/2019JB019169en_US
dc.identifier.urihttps://hdl.handle.net/1911/109556en_US
dc.language.isoengen_US
dc.publisherWileyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleHydraulic Injection‐Induced Velocity Changes Revealed by Surface Wave Coda and Polarization Data at a Shale Play Site in Southwest Chinaen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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