Abstract
Pore pressure and fracture pressure predictions were made using seismically derived velocities from Onshore Niger Delta. Mild to moderate overpressure regime in the study area was predicted using Bowers’ unloading model. The onset of mild overpressure (<0.6 psi/ft) in the area lies within the depth range of 6000-10000 ftss. The formation becomes moderately over pressured (<0.8 psi/ft) as the pressure increases with depth up to about 20000 ftss. Evidence of fluid volume expansion unloading mechanism in the area was depicted by the elastic rebounds, and hence the unloading effect, on the Vint – VES cross plots. Key words: Pore pressure predictions, fracture pressure, seismic velocities, overpressure, unloading mechanism.
Highlights
Pore pressure prediction ahead of the drill bit is required for safe and economic drilling, especially in tertiary basin like the Niger Delta
The results show that the study area is overpressured, ranging from mild to hard overpressures
The onset of mild overpressures (< 0.60 psi/ft) in the area lies within the depth ranges of about 10,000 ftss in Wells A and B and about 6000 ftss in Well C
Summary
Pore pressure prediction ahead of the drill bit is required for safe and economic drilling, especially in tertiary basin like the Niger Delta. Literature has been populated with works on the use of seismic data for predrill pore pressure prediction. Pore pressure prediction from seismic interval velocities is based on the assumption that there is a constant regional relationship between acoustic velocity and effective stress.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
