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



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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