Understanding the pore pressures and stress distribution within the subsurface is of paramount importance in the design of a well in order to accurately determine the allowable drilling window. Many of the conventional methods that exist to predict the pore pressures and stresses within shale sequences assume isotropic properties. This paper presents a pragmatic, data-driven approach in order to deal with anisotropy by utilising all the data types from the interpretation of well, drilling and pore pressure data.

Many studies have shown the important role that pore pressure and stresses play in the full life cycle of a field, not least in the determining of a safe drilling margin (see, for example, Green et al., 2016 and references therein). Conventionally, in shale dominated sequences the pressures and stresses are estimated by either using deterministic, empirical equations (Zhang, 2011) or by building holistic, geologically-driven pressure and stress models (Edwards et al., 2017)...

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