Case Studies

Niger Delta Pressure Study Phase 3: Onshore and Swamp

This is the first authoritative study of subsurface pressures in the Niger Delta deep water and ultra deep water areas, based on 94% of exploration and appraisal wells drilled.

The Niger Delta pressure study delivers an understanding of the effect of overpressure on hydrocarbon trapping in the Niger Delta, and discusses the implications for exploration in the region.  The high capture of well data contributes to the building of predictive relationships critical to the planning of safe deep water wells.

This study investigates:

  • Distribution and control of overpressures including variations in top of overpressure and vertical/lateral seals.
  • Evidence for lateral transfer (leading to higher than expected pressures when drilling).
  • Trap integrity assessment – seal breach risking and top seal failure.
  • Lateral drainage and implications for migration, hydrodynamic flow and tilted OWCs.

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