Phase One of the Niger Delta Pressure Study (Deep and Ultra-Deep Water) has expanded our knowledge of subsurface pressure through the analysis of more than 90% of the available deep water and ultra-deep water wells in the region. Many of the wells encountered overpressures (pressure above normal) which is expected given their depth age and depositional setting. However, the magnitude of overpressure is lower than expected, given the rate of sedimentation of this active delta. The pressure study has created a database from which it has been possible to develop a methodology for prediction of pore pressure, overburden and fracture pressure anywhere within the study area. Wireline logs from more than 150 wells were analysed for shale pressures, and compared to direct measurement of reservoir pressures where available. The comparison leads to conclusions about regional reservoir connectivity, vertical pressure communication and seal effectiveness. Both regional and local relationships to describe fracture pressure and overburden have been developed, all of which lead to more confidence for subsurface prediction in future drilling targets. In addition, the nature of regional reservoir connectivity predicts trapping geometries and relationships between hydrocarbons and fluid flow phenonema which would otherwise be ignored. Careful analysis of pressure data in producing fields confirms many of these relationships.