3-D Seismic Structural Interpretation of High Field Offshore Western Niger Delta

Abstract

Seismic Structural interpretation of subsurface system is a vital tool in mapping source rocks and good trapping system which enhances good understanding of the subsurface system for productive drilling operation. This study is geared towards mapping the structural traps available within the hydrocarbon bearing zones of the “High field” with the use of well log and 3D seismic data. Seven horizons (H₁, H₂, H₃, H₄, H₅, H₆ and H₇) were identified on well logs using gamma ray log and resistivity logs. Nine (9) faults were mapped on seismic sections across the field, two (2) of which are major growth faults (F₁ and F₂), two (2) synthetic faults (F₃ and F₇) and five (5) antithetic faults (F₄, F₅, F₆, F₈ and F₉). Rollover anticlines which are structural closure and displayed on the depth structural maps suggest probable hydrocarbon accumulation at the down throw side of the fault F₁. Structural interpretation of high field has revealed a highly fault assisted reservoir which depicts the tectonic setting of Niger Delta basin.