ABNORMAL HIGH WELL PRESSURE

Abnormal high pressure subsurface fluid pressure that is higher than would be expected for that depth with normal hydrostatic pressure alone. The normal hydrostatic high pressure increase depends on the density of the ground water.
The pressure increase is 45 psi/100 ft for water with a solinity of 55.4 ppt and 46.5 psi/100ft for water salinity of 100 ppt.

Abnormal high pressure usually occurs in reservoirs that are sealed by surrounding rocks shuch as chales or by faults that do’nt allow fluids to escape the reservoir. During burial, the sedimentary rocks compact by expelling fluids from the pore spaces. In an abnormally high pressure reservoir, the fluids have been prevented from being expelled by the surrounding rocks, an the rock or lithostatic pressure, which increases about 100 psi/100 ft depth, is transferred to the fluid pressure.

Abnormal high-pressure reservoirs have pressure between hydrostatic and lithostatic pressures. Reservoirs witth abnormal high pressures have relatively low seismic velocities and low densities and are in contrast t abnormal high pressure reservoirs.

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