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166   PORE PRESSuRE PREdIcTIOn FOR ShAlE FORmATIOnS uSInG WEll lOG dATA


            σ ob         Overburden stress gradient (psi/ft)     dutta  nc.  deepwater geohazard prediction using prestack
            PEF          Photoelectric absorption factor log (unitless)  inversion of large offset P‐wave data and rock model.  lead
            ρ b          Bulk density (g/cm )                      Edge 2002;21 (2):193–198.
                                        3
            v            Sonic velocity (ft/s)                   Eaton BA. The equation for geopressure prediction from well logs.
            cAl and      caliper logs (inch)                       Fall meeting of the Society of Petroleum Engineers of AImE;
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             cAlX                                                  onepetro.org/mslib/app/Preview.do?papernumber=00005544&
            mwt          mud weight (psi/ft)                       societycode=SPE. Accessed January 13, 2014.
            Ecd          Equivalent circulation density (psi/ft)
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