The term pore pressure can be confusing. Pore pressure is predicted in relatively impermeable beds (shale and clay) and measured in reservoir quality rocks (sand). However, in many occasions, there is not a direct link between the pressure in the sand and in the sandwiching shale. Assuming such an immediacy can lead to serious drilling problems. The relationship between predicted (PPP) and measured (MPP) pore pressure is often complicated and establishing the relationship involves analysis of the geologic setting and expected hydrocarbons. This article will discuss the various causes for differing PPP and MPP and construction of an accurate pore...

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