The discussion opened by R. E. Chapman deals with many subjects that, if properly understood, can greatly help to trace the migration of fluids in sedimentary basins.

The two equations

Φ=gz+pρ,
(1)

P=ρΦ=ρgh+p,
(2)

are identical if we assume P = ρΦ and z = h. In the writer’s opinion equation (2) can be more easily understood by a geologist because the hydraulic potential is directly related to the pressure measured in the well plus an addendum depending upon the elevation, z or h, of the...

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