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• W2891834391 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2018Predicted and observed shear on preexisting faults during hydraulic fracture stimulationAuthors: Mark D. ZobackJens-Erik Lund SneeMark D. ZobackStanford University Department of GeophysicsSearch for more papers by this author and Jens-Erik Lund SneeStanford University Department of GeophysicsSearch for more papers by this authorhttps://doi.org/10.1190/segam2018-2991018.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Multi-stage hydraulic fracturing increases production from extremely low-permeability unconventional reservoirs by simultaneously inducing slip on pre-existing fracture planes. Here we illustrate how the high pore pressure generated during hydraulic fracturing operations induces slip on pre-existing fractures and faults with a wide range of orientations, thus creating an interconnected permeable fracture network. We demonstrate the basic principles of stimulating slip on poorly oriented faults using the stress state for a horizontal well in the Barnett Shale where fracture orientation data are also available from an image log. We compare this analysis with independent fracture orientation data obtained from earthquake focal plane mechanisms. Using the stress data, we are able to determine which nodal plane slipped in each microseismic event. As the two analyses yield essentially identical results, they show the basic processes by which slip on planes of varied orientations occurs during hydraulic stimulation. We extend this analysis to address some misconceptions about the likelihood of slip on horizontal bedding planes and planes parallel and perpendicular to horizontal principal stress directions. Notably, we show that inducing slip on horizontal or sub-horizontal bedding planes is nearly impossible except in compressive (reverse to strike-slip/reverse) stress states (SHmax ≥ Shmin ≈ SV) or when ambient pore pressure is extremely high. The latter case results in very small differences in the magnitudes of the three principal stresses, regardless of the regional stress state. Presentation Date: Wednesday, October 17, 2018 Start Time: 8:30:00 AM Location: 202A (Anaheim Convention Center) Presentation Type: Oral Keywords: geomechanics, fracture stimulation, microseismic, pore pressure, hydraulic fracturingPermalink: https://doi.org/10.1190/segam2018-2991018.1FiguresReferencesRelatedDetailsCited byThe Influence of a Transitional Stress Regime on the Source Characteristics of Induced Seismicity and Fault Activation: Evidence from the 30 November 2018 Fort St. John ML 4.5 Induced Earthquake Sequence4 April 2022 | Bulletin of the Seismological Society of America, Vol. 112, No. 3Numerical simulation of microseismicity induced by hydro-fracturing and its interpretation in terms of dissipative structures28 July 2021 | Arabian Journal of Geosciences, Vol. 14, No. 15Geomechanical stress conditions to induce half-moon events during hydraulic fracturingNepomuk Boitz and Serge A. Shapiro13 July 2021 | GEOPHYSICS, Vol. 86, No. 4Quick Evaluation for Optimal Recovery in Unconventional ReservoirsReinaldo J. Michelena*, Huabing Wang, and James R. Gilman21 January 2021Hydraulic Fracturing‐Induced Seismicity24 July 2020 | Reviews of Geophysics, Vol. 58, No. 3A methodology for unstructured damped stress inversion of microseismic focal mechanisms: Application to the Vaca Muerta Formation, ArgentinaBing Q. Li and Jing Du9 January 2020 | GEOPHYSICS, Vol. 85, No. 2Impact of the stress state and the natural network of fractures/faults on the efficiency of hydraulic fracturing operations in the Goldwyer Shale FormationThe APPEA Journal, Vol. 60, No. 1The relation between stimulated shear fractures and production in the Barnett Shale: Implications for unconventional oil and gas reservoirsAlex Hakso and Mark Zoback30 October 2019 | GEOPHYSICS, Vol. 84, No. 6Geomechanical conditions to create half-moon events during hydraulic fracturingNepomuk Boitz and Serge Shapiro10 August 2019Is bedding-plane slip a common microseismic source during hydraulic fracturing?James Rutledge10 August 2019 SEG Technical Program Expanded Abstracts 2018ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2018 Pages: 5520 publication data© 2018 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 27 Aug 2018 CITATION INFORMATION Mark D. Zoback and Jens-Erik Lund Snee, (2018), Predicted and observed shear on preexisting faults during hydraulic fracture stimulation, SEG Technical Program Expanded Abstracts : 3588-3592. https://doi.org/10.1190/segam2018-2991018.1 Plain-Language Summary Keywordsgeomechanicsfracture stimulationmicroseismicpore pressurehydraulic fracturingPDF DownloadLoading ..." @default.
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