[01] G. Z. Ugwu, Department of Industrial Physics, Enugu State University of Science and Technology, Enugu, Nigeria.

Pore pressure predictions for an onshore Niger Delta area were made using offset well logs. Mild – to – moderate overpressure regime was estimated in the area. Onset of mild overpressure (<0.6 psi/ft) in the area is at about 6600 – 11500ftss. The pressure increases with depth to become moderately overpressured (< 0.8 psi/ft) throughout the depth extent of about 12200 – 15700ftss.

Pore Pressure Predictions, Well Logs, Overpressure, Niger Delta

[01] Bowers GL (1995). Pore pressure estimation from velocity data; accounting for overpressure mechanisms besides undercompaction, SPE Drilling and completions. [02] Doust H, Omatsola E (1990). Niger Delta, in: Divergent/Passive Margin basin, Edwards JD, Santogrossi PA (eds.), AAPG Memoir 45, 239-248. [03] Eaton BA (1975). The equation for geopressure prediction from well logs, Soc. Petr. Engineers, Paper SPE 5544. [04] Hottman CE, Johnson RK (1965). Estimation of formation pressures from log derived shale properties, Journ. Pet. Techn., 6, 717-722. [05] Lopez JI, Rappold PM, Ugueto GA, Wieseneck JB, Vu K (2004). Integrated shared earth model: 3D pore pressure and uncertainty analysis. The Leading Edge, 52-59. [06] Murat RC (1972). Stratigraphy and paleography of the Cretaceous and Lower Tertiary in Southern Nigeria in: Dessauvagie TFJ, Whiteman AJ (eds.), African Geology, Ibadan University Press, 251 – 265. [07] Nwozor KR, Omudu MI, Ozumba BM, Egbuachor CJ, Onwuemesi AG, Anike OL (2013). Quantitative evidence of secondary mechanisms of overpressure generation: Insights from parts of Onshore Niger Delta, Nigeria, petr. Techn. Dev. Jour., 3(1), 64-83. [08] Opara AI, Onuoha KM, Anowai C, Onu NN, Mbah RO (2013). Geopressure and trap integrity predictions from 3-D seismic data: Case Study of the Greater Ughelli Depobelt, Niger Delta. Oil and Gas Science and Technology – Rev. IFP Energies nouvelles, 68(2), 383-396. [09] Reyment RA (1965). Aspects of Geology of Nigeria, Ibadan University Press. Bull. Geol. Surv. Nigeria, 1, 95p. [10] RokDoc 5.1 www.ikonscience.com. [11] Short KC, Stauble AJ (1967). Outline of the Geology of the Niger Delta Ass. Petr. Geol. Bull. 54, 170-171. [12] Terzaghi K (1943). Theoretical soil mechanics, John Wiley and Sons, Inc. [13] Ugwu GZ (In Press). Pore pressure prediction using seismic data: insight from onshore Niger Delta. Jour. Geol. Min. Res. [14] Yoshida C, Ikeda S, Eaton BA (1996). An investigative study of recent technologies for prediction, detection and evaluation of abnormal formation pressure and fracture pressure in North and South America. IADC/SPE 36381. [15] Zhang J, Wieseneck J (2011). Challenges and surprises of abnormal pore pressure in the shale gas formations. Paper SPE 145964 presented at SPE Annual Technical Conference and Exhibition, Denver, Colorado, USA