Temporal Variations of Near‐Surface Anisotropy Induced by Hydraulic Fracturing at a Shale Play Site in Southwest China

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dc.citation.firstpage8032en_US
dc.citation.issueNumber9en_US
dc.citation.journalTitleJournal of Geophysical Research: Solid Earthen_US
dc.citation.lastpage8044en_US
dc.citation.volumeNumber123en_US
dc.contributor.authorZuo, Qiankunen_US
dc.contributor.authorTang, Youcaien_US
dc.contributor.authorNiu, Fenglinen_US
dc.contributor.authorLi, Guoliangen_US
dc.contributor.authorChen, Haichaoen_US
dc.contributor.authorTao, Kaien_US
dc.contributor.authorChen, Benchien_US
dc.date.accessioned2018-11-01T19:40:04Zen_US
dc.date.available2018-11-01T19:40:04Zen_US
dc.date.issued2018en_US
dc.description.abstractKnowledge of the geometric properties of fractures and cracks in a petroleum reservoir is important to reservoir exploitation. When aligned and partially connected, fractures and cracks can act as conduits for fluid flow and thus can significantly increase the permeability of the reservoir. The aligned fractures and cracks, on the other hand, are an effective means to generate seismic anisotropy. In this study, we utilize the seismic data recorded by a vertical array installed in a shallow borehole at a shale play site in southwest China. By applying seismic interferometry to the ambient noise data recorded by 12 three‐component geophones, we extract P and S waves propagating vertically along the borehole. The S waves show up to 20% velocity variations with respect to their polarization directions. Such large S wave anisotropy can be explained by the horizontal transverse isotropic model and is likely caused by natural fractures that are widely present in the area and align approximately in the NE‐SW direction. During the 13‐day period of hydraulic fracking treatment, we also observe large and systematic temporal variations in S wave velocity, degree of S wave polarization anisotropy, and fast polarization direction. By comparing our observations with normal strain changes calculated with a half‐space elastic model, we speculate that strain changes induced by hydraulic injection and fracturing are likely to be responsible for the observed temporal variations in seismic anisotropy. As such, seismic interferometry with shallow borehole acquisition might provide an alternative means to monitor hydraulic fracturing and wastewater injection in the future.en_US
dc.identifier.citationZuo, Qiankun, Tang, Youcai, Niu, Fenglin, et al.. "Temporal Variations of Near‐Surface Anisotropy Induced by Hydraulic Fracturing at a Shale Play Site in Southwest China." <i>Journal of Geophysical Research: Solid Earth,</i> 123, no. 9 (2018) Wiley: 8032-8044. https://doi.org/10.1029/2018JB016037.en_US
dc.identifier.doihttps://doi.org/10.1029/2018JB016037en_US
dc.identifier.urihttps://hdl.handle.net/1911/103288en_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.titleTemporal Variations of Near‐Surface Anisotropy Induced by Hydraulic Fracturing 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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