Geoscientists are inclined to use pore pressure (PP) plots expressed in PSI versus depth (P-D) because it is beneficial for prospect and play-concept compartmentalization and seal integrity appraisals. On the other hand, drillers and engineers use mud weight equivalents (MWE) in pounds per gallon versus depth (PPG-D) to prepare their well prognosis and carry out their drilling program.

The conversion method for calculating PPG from the actual measurements in PSI is usually computationally distorted, especially in a geopressured system. PP in permeable beds shows a positive gradient slope on the P-D plot but it generally has a negative slope on...

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