Distribution of Pore Pressure Gradient for Some Deep Formations in Iraqi Oil Fields

Abstract

Pore pressures are the fluid pressures in the pore spaces in the porous formations.
Interactive Petrophysic (IP) software is used to determine the pore pressure gradient from log
data. These data are (GR log, Bulk Density and Sonic log).
Surfer software is used to create the formation pressure distribution maps. These maps
show the pore pressure gradient (PPG) for sex formations in contour forms. The formations are
chosen depending upon the availability of formation in 11wells/11 fields. These maps are
provided the pore pressure distribution in middle and south of Iraq and eventually, give a clear
imagination for high and low pressure regions for each formation separately.
Six formation are considered in this research, these formations which existed in early
Cretaceous and late Jurassic (deep formations) are Shuaiba, Zubair, Ratawi, Yammama, Sulaiy
and Gotnia.
Finally, the outputs of these software helps to explain the abnormal pressure location and
their distribution for the formation under study, this assists to expected the drilling mud program
for these formation.