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

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