Abstract:
Reservoir characterisation and formation evaluation of ‘Favour’ Field, Niger Delta was carried out
with the aim of mapping; analysing and quantifying the reservoir properties of the reservoirs within
the field of study.
The interpretation was done using Petrel software. These include the generation of well correlation
panel for the wells, differentiation of different lithological units in the study area using gamma ray
Log; identification of reservoirs with hydrocarbon bearing potentials; characterisation of the fluid
resources in the rock pore space of the reservoirs using resistivity log; and the determination of
some petrophysical properties of the reservoirs. The parameters investigated were porosity,
permeability, water saturation (Sw), net-to-gross ratio (N/G), volume of shale (Vsh), relative
permeability of water (Krw), bulk volume of water (BVW), hydrocarbon pore volume (HCPV)
among others.
Seven reservoirs were identified. These reservoirs were found to be continuous laterally in all the
wells except in well “B” where the continuity terminates at reservoir four. The lithology of the
field indicated sand and shale intercalations of which the sands are coarse grains from reservoir
‘001’ to ‘003’ and fine-to-medium from reservoirs ‘004’ to ‘007’. These reservoirs have a great
deal of net-to-gross ratio. Likewise, the reservoirs are found to be of significant thickness of
between 72.1ft and 1027.18ft with high average reservoir thickness of between 110.71ft and
1017.82ft. The average reservoir porosity varies from 21.69% to 30.26% while the average
permeability was between 1246.70md and 25708.79md.
The reservoir sands was ranked high and medium yield based on the interactions of porosity,
permeability and hydrocarbon saturation. The depositional trend was interpreted to be from west
to northeast direction because the values of net-to-gross recorded decreases from west to northeast
since energy of deposition decreases from proximal to distal. The field was found to consist of
high quality potential reservoir rock as a result of high net-to-gross values. The field result
indicates that porosity increases as permeability increase and irreducible water saturation
decreases.
The interpretation shows that the “Favour” field reservoirs are highly saturated and prolific
hydrocarbon habitat/zones due to perfect porosity, excellent permeability and high hydrocarbon
saturation recorded in the entire reservoirs of the field.
