0.433 psi/ft for freshwater gradient, and 0.465 psi/ft for typical Guld of Mexico (100k ppm total dissolved solids). 0.449 psi/ft is mid-way between the two, so 0.45 psi/ft is not far off the mid-point.
I had to use an estimate as we dont know the water resistivity yet. The UK North Sea oil fields (sandstone) I worked on were around 0.465 psi/ft.
Ann: Hydrocarbon gas recovered & evaluation program forward plan, page-1177
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