TITLE:
Integrated Modelling and Reservoir Characterization of Ataga Field, Niger Delta Basin, Nigeria
AUTHORS:
Jerry Danwazan, Kehinde Joseph Egunjobi, Richard Olorunfemi Akinwande
KEYWORDS:
Niger Delta, Growth Faults, Rollover Anticlines, Reservoirs, Hydrocarbon Saturation
JOURNAL NAME:
International Journal of Geosciences,
Vol.14 No.5,
May
31,
2023
ABSTRACT: Integrated modelling, well correlation and
petrophysical analysis were performed to characterize the reservoirs for
optimum hydrocarbon correlation using 3-D seismic reflection data and suites of
well logs from Ataga 5, 7, 10 and 11 wells respectively in Ataga field, shallow
offshore, Niger Delta Basin, Nigeria. The study revealed the presence of two
viable hydrocarbon bearing reservoirs, AT1 and AT2 and the average values of porosity,
permeability, water saturation, hydrocarbon saturation, Net to Gross (NTG) and
volume of shale are in the ranges of 15% - 77%, 44.5% - 75.5%, 25.5% - 85%, 15%
- 75.5%, 0.70 - 0.88 and 0.11 - 0.38 respectively which goes further to show
that the both reservoirs have fair characteristics that are suggestive of the
presence of hydrocarbon accumulation. It can therefore be deduced that the
permeability values are reflective of fair interconnectivity of pore spaces of
sands within the well areas and their ability to transmit fluids, the depth and
depth structural map generated for the horizons and structures shows that the
most dominant trapping mechanism in the area under study is the crescentic
growth fault and the rollover anticlines trending in the Northwest-Southeast
direction and from the volumetric analysis. It can be deduced that the
recoverable gas for AT1 and AT2 reservoirs is 2 × 106 mscf and 6 ×
106 mscf respectively.