Page 284 - Reservoir Geomechanics

265 Wellbore failure and stress determination in deviated wells

within the shale despite the sub-parallel bedding planes being present within all the
sedimentary units.
In summary, in deviated wells (or vertical wells encountering bedding or aligned frac-
tures at a high angle to the wellbore), the theory developed by Boness and Zoback (2006)
allows one to separate stress-induced from structurally induced anisotropy (assuming
the orientation of the structures are known) thus providing another technique for deter-
mining stress orientation.