Page 42: of Offshore Engineer Magazine (Nov/Dec 2014)

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of Black Sea due to fewer data. to discharge areas. In these ? ow systems

Pressure-elevation (p(z)) pro? les show the main ? ow direction is horizontal in signi? cantly overpressured zones and the midrange areas. It can be observed on super-hydrostatic gradients from both Fig. 1 where near vertical potential lines study areas. Overpressure is usually indicate horizontal ? ow in the upper part

Drilling

Predicting formed by rapid sedimentation when of the section. If there is an underlying pore water cannot leave the sediments overpressured zone then it will be super- and it has to carry the burden of imper- imposed and limit the downward exten- meable overlying layers, which act as a sion of the gravitational system resulting pressures pressure seal. Since this seal is thought in upward directed ? ow.

to be responsible for maintaining the In an offshore environment the pres-

With a slightly di