Integration of Sequence Stratigraphy and Petrophysical Analysis for Reservoir Characterization: A Case Study of “ED” Field, Offshore Niger Delta

Abstract

Sequence stratigraphic concept for continental settings was assessed to analyze the depositional systems of the formations penetrated by wells in ‘ED’ Field. Identification and delineation of three sequences and their bounding surfaces was carried out using well logs. Three hydrocarbon bearing reservoirs labelled as ED-R-1000, ED-R-2000 and ED-R-3000 were delineated. Computation of petrophysical properties of reservoir rocks was executed using well established relationship. The stratigraphy comprising of an alternation of sands and shales typically was of the Agbada Formation. The petrophysical analysis results give a good indication of the reservoirs’ capability of accumulating hydrocarbon in their interstitial pore spaces. Three stratigraphic surfaces were used to sub-divide the study field into three (3) depositional sequences and further subdivide the sequences into three system tracts. They are 1154ft(m), 382ft(m) and 738ft(m) thick respectively. The depositional environment of the study field includes distributary channel fill, regressive to transgressive shoreface delta, delta front and storm dominated shelf. The best quality reservoir will be found in the lowstand system tract while TST is a good sealing rock in the study field. Keywords: Stratigraphy, Depositional sequence, Petrophysical, Well logs. DOI: 10.7176/JEES/13-1-05 Publication date: January 31 st 2023