Seismic source mechanism inversion from a linear array of receivers reveals non-double-couple seismic events induced by hydraulic fracturing in sedimentary formation |
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Authors: | Zuzana Jechumtlov Leo Eisner |
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Institution: | aGeophysical Institute, Ac. Sci. of Czech Rep., Boční II 1401, Prague 4, 141 31, Czech Republic;bFormerly Schlumberger Cambridge Research, High Cross, Madingley Road, Cambridge, CB3 0EL, United Kingdom;cMicroSeismicinc, Inc., 800 Tully Road, Houston, TX 77079, United States |
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Abstract: | We developed a new method to invert source mechanisms of seismic events observed from a single (vertical or near vertical) array of receivers. This method was tested on a synthetic dataset and applied to a seismic dataset acquired during hydraulic fracturing of a sedimentary formation. We show that a crack-opening seismic event recorded on a single vertical array can be inverted as a pure shear seismic event, indicating that the best fitting shear mechanisms inverted from seismic data acquired along a vertical borehole provide misleading information. We found that the majority of the analyzed source mechanisms of the induced events are not consistent with pure shear faulting as previously thought. The non-shear source mechanisms are required even when seismic noise, location uncertainty, and uncertainty in the attenuation structural model are considered. |
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Keywords: | Moment tensor inversion Non-double-couple mechanisms Hydraulic fracturing Induced seismicity |
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