In a gulf coast well, the speed of sound is 10,000 ft/sec at a depth of 13,500 ft. the normal speed of sound at this depth, based on extrapolated trends, would be 12,000 ft/sec. what is the pore pressure at this depth?

0.69 psi/ft  

Explanation:

speed of sound at depth of 13500 ft = 10000 ft/sec

normal speed of sound at 13500 ft = 12000 ft/sec

time taken to travel at 10000 ft/s (t) =

time taken to travel at 12000 ft/s(t n) =

assume overburden stress gradient = S/D = 1 psi/ft

normal pore pressure gradient = = 0.465 psi/ft

using imperical formula

                =

                = 0.69 psi/ft  

Pore pressure =  0.69 psi/ft  

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