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FIGURE E.3 Example of a reactivated fault during hydraulic fracturing. The figure is a map view of a microseismicity (colored spheres which are colored by magnitude; cool colors are small events) during a hydraulic fracture treatment. The fracturing well is shown by the pink line and is deviated away from a central wellhead location and extends vertically through the reservoir section; the injection location is labeled “Perforations.” The data were recorded and analyzed using borehole receivers (marked Geophones). The blue dots show the growth of the hydraulic fracture to the northwest, then intersecting and reactivating a small fault in the reservoir, shown by change in fracture orientation and larger magnitude events (yellow dots). SOURCE: From Maxwell et al. (2008).



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