Changes

| Check to see if anomalous pressures make geological sense.  

| Check to see if anomalous pressures make geological sense.  

* ''' Example: ''' Measured fluid pressure is [[pressure::250 psi]] over the static water pressure. The formation is believed to contain 30°API [[oil gravity|gravity]] oil, and the total vertical trap closure is [[length::500 ft]].

* ''' Example: ''' Measured fluid pressure is [[pressure::250 psi]] over the static water pressure. The formation is believed to contain 30°API [[oil gravity|gravity]] oil, and the total vertical trap closure is [[length::500 ft]].

* ''' Solution: ''' If the 250-psi pressure is due to the presence of a hydrocarbon column, then a column of [[depth::2500 ft]] of 30°API gravity oil would have to be present in the trap (assuming a [[Constructing a hydrostatic pressure-depth plot#Rules of thumb|freshwater gradient]]). Vertical trap closure is only [[length::500 ft]]; therefore, the measured formation pressure does not match the geology and is probably wrong.

* ''' Solution: ''' If the 250-psi pressure is due to the presence of a hydrocarbon column, then a column of [[depth::2500 ft]] of 30°API gravity oil would have to be present in the trap (assuming a [[Constructing a hydrostatic pressure-depth plot#Rules of thumb|freshwater gradient]]). Vertical trap [[closure]] is only [[length::500 ft]]; therefore, the measured formation pressure does not match the geology and is probably wrong.

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