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  1. Results of Downhole Microseismic Monitoring at a Pilot Hydraulic Fracturing Site in Poland — Part 2: S-Wave Splitting Analysis.Wojciech Gajek, Michał Malinowski & James P. Verdon - 2018 - Interpretation: SEG 6 (3):SH49-SH58.
    Observations of azimuthal seismic anisotropy provide useful information, notably on stress orientation and the presence of preexisting natural fracture systems, during hydraulic fracturing operations. Seismic anisotropy can be observed through the measurement of S-wave splitting on waveforms generated by microseismic events and recorded on downhole geophone arrays. We have developed measurements of azimuthal anisotropy from a Lower Paleozoic shale play in northern Poland. The observed orthorhombic anisotropic symmetry system is dominated by a vertically transverse isotropy fabric, produced by the alignment (...)
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  • Estimating Microseismic Detectability of the Surface-Monitoring Network Using Downhole-Monitoring Array.Paweł Wandycz, Eryk Święch, Leo Eisner, Andrzej Pasternacki, Denis Anikiev & Tomasz Maćkowski - 2018 - Interpretation 6 (3):SH107-SH115.
    We have analyzed microseismic monitoring data sets obtained from the surface and downhole-monitoring arrays recorded during the first experiment of hydraulic fracturing in Poland. Using the downhole-monitoring network, we were able to record and locate 844 microseismic events, including 10 perforation shots from six stages of the stimulation. We detected 2 perforation shots and no microseismic events using the surface array, which was operational only during the first two stages of the stimulation. To explain the poor detectability of the surface (...)
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  • Estimating Microseismic Detectability of the Surface-Monitoring Network Using Downhole-Monitoring Array.Paweł Wandycz, Eryk Święch, Leo Eisner, Andrzej Pasternacki, Denis Anikiev & Tomasz Maćkowski - 2018 - Interpretation: SEG 6 (3):SH107-SH115.
    We have analyzed microseismic monitoring data sets obtained from the surface and downhole-monitoring arrays recorded during the first experiment of hydraulic fracturing in Poland. Using the downhole-monitoring network, we were able to record and locate 844 microseismic events, including 10 perforation shots from six stages of the stimulation. We detected 2 perforation shots and no microseismic events using the surface array, which was operational only during the first two stages of the stimulation. To explain the poor detectability of the surface (...)
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