scholarly journals Pore Pressure Prediction of an Oil-Field in Part of the Niger Delta Basin, Nigeria

2020 ◽  
Vol 23 (12) ◽  
pp. 22673
Author(s):  
F.I. Chiazor ◽  
F.T. Beka
Keyword(s):  
Pore Pressure ◽  
Niger Delta ◽  
Oil Field ◽  
Pore Pressure Prediction ◽  
Niger Delta Basin

scholarly journals Estimation of overpressures from porosity based method : a theoretical approach applied to the central/coastal swamp depo-belts of the Niger delta basin

2017 ◽  
Vol 6 (1) ◽  
pp. 14
Author(s):  
Ubon Mkpese
Keyword(s):  
Bulk Density ◽  
Pore Pressure ◽  
Theoretical Approach ◽  
Niger Delta ◽  
Sonic Velocity ◽  
Pore Pressure Prediction ◽  
Formation Resistivity ◽  
Pressure Regime ◽  
Niger Delta Basin

The Depth-dependent compaction theory that variations in certain geophysical properties with depth; bulk density, formation resistivity together with sonic velocity being a reflection of the pressure regime is the basis for pore pressure prognosis study. Pore pressure prediction (PPP), when done accurately can be used to avert disaster and helps in safe drilling. A porosity-based model has been applied to predict overpressured zones in an onshore environment of the Niger delta basin. Zones with hard overpressures greater than a magnitude of 0.7 psi/ft are generally within 10000ft and below. Top of overpressures for studied wells ranges between 7000ft and 10000ft. Porosities in shale are of typical values ranging between 0.05 to 0.46. A robust concordance between PPP and MPP profiles for each of the wells validates the results here and confirms suitability of model to the studied area.

3-D pore pressure prediction using seismic data in an oil field in southwest Iran

2008 ◽  
Author(s):  
Ehsan Nosrat ◽  
Abdolrahim Javaherian ◽  
Mahmoud Reza Torabi and Homayoun Behzad Asiri
Keyword(s):  
Pore Pressure ◽  
Seismic Data ◽  
Oil Field ◽  
Pore Pressure Prediction ◽  
Southwest Iran

scholarly journals Pore pressure prediction in Niger Delta high pressure, high temperature (HP/HT) domains using well logs and 3D seismic data: a case study of X-field, onshore Niger Delta

2021 ◽  
Vol 11 (10) ◽  
pp. 3747-3758
Author(s):  
Abdulquadri O. Alabere ◽  
Olayemi K. Akangbe
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Pore Pressure ◽  
Niger Delta ◽  
Seismic Velocity ◽  
Sedimentary Basins ◽  
Geothermal Gradient ◽  
Pore Pressure Prediction ◽  
Fracture Gradient ◽  
High Temperature High Pressure

AbstractFew wells targeting high temperature, high pressure intervals in most tertiary sedimentary basins have achieved their objective in terms of technicalities and cost. Since most shallow targets have been drilled, exploration focus is drifting into deeper plays both onshore and in deep offshore areas. To ensure safe and economic drilling campaigns, pore pressure prediction methodologies used in the region needs to be improved. The research aims at generating and testing a modification of Eaton’s equation fit for high temperature, high pressure intervals on a field. The evolution of pore pressure in the field was established from offset well data by making several crossplots, and fracture gradient was computed using Mathew and Kelly’s equation. Eaton’s equation parameters were then calibrated using several wells until a desired field scale result was achieved when compared with information from already drilled intervals i.e., kicks and RFT data. Seismic velocity data resulting from high density, high resolution velocity analysis done to target deep overpressured intervals were then used to predict 1D pore pressure models at six selected prospect locations. Analyses reveal depths shallower than 3800 m TVD/MSL with geothermal gradient 3.0 °C/100 m and pressure gradient less than 1.50sg EMW are affected mainly by undercompaction; depths greater than 3800 m TVD/MSL with geothermal gradient of 4.1 °C/10 m and pressure gradients reaching 1.82–2.12sg EMW are affected by unloading with a narrow drilling margin for the deep highly pressured prospect intervals. Eaton’s n-exponent was modified to 6, and it proved accurate in predicting high overpressure in the first prospect wells drilled.

Abnormal High Pore Pressure Prediction and Cause Analysis of Salt and Anhydrite Formation of Fauqi Oilfield in Iraq

2014 ◽  
Vol 638-640 ◽  
pp. 350-354
Author(s):  
Sheng Xiang Wang ◽  
Feng Lin ◽  
Fan Zhang ◽  
Jin Gen Deng ◽  
Bao Hua Yu ◽  
...  
Keyword(s):  
High Pressure ◽  
Pore Pressure ◽  
Oil Field ◽  
Prediction Methods ◽  
Sonic Velocity ◽  
Composite Analysis ◽  
Cause Analysis ◽  
Density Data ◽  
Field Situation ◽  
Pore Pressure Prediction

Abnormal high pressure exists in Lower Fars formation of Fauqi oil field in Iraq and lead to many complicated problems during drilling. There are salt, anhydrite and shale in Lower Fars formation through lithology analysis. Through the crossplot of sonic velocity vs. density data, it can be identified that the high pressure of Lower Fars is cause by the undercompaction of shale. Through composite analysis of different prediction methods of pore pressure, Eaton model is used to calculate the pore pressure of Lower Fars. The pore pressure begins to increase at the MB4 layer and declines to normal value at MB2 layer, and the peak is about 2.20 . The calculated results are in conformity with field situation, which can be applid to guide drilling practice in Fauqi oil field.

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