Authors :
Osaki, L.J; Itiowe, K, Mgbeojedo; T.I, Agoha, C.C; Onwubuariri, C.N; Okoro, E.M
Volume/Issue :
Volume 6 - 2021, Issue 10 - October
Google Scholar :
http://bitly.ws/gu88
Scribd :
https://bit.ly/2ZCuY9O
Abstract :
The 3D seismic intėrpretation and
petrophysical assessment of thė JAKS oil field in the
Niger Dėlta was successfully carried out by performing a
comprehensive structural analysis, reservoir delineation
and volumetric assessment of the field using seismic
data, drilling logs and empirical formulas. The work was
carried out in two stages; seismic data interpretation and
petrophysical data analysis. These phases are combined
to evaluate the hydrocarbon reserves of the reservoir
using the empirical formula approach. The methodology
includes the delineation of lithology from the gamma ray
log, the identification of reservoir fluid types from the
resistivity and the neutron / density combination log,
borehole correlation, horizon and fault mapping from
seismic data, determination of petrophysical parameters
from empirical equations. The reservoirs' original
hydrocarbon stocks were also assessed based on the
weighted averages of porosity, water saturation, gross
rock volume and net to gross ratio. The research shows a
deep structure map with massive, NNW running
anticline, with four associated fold-related synthetic and
antithetical normal faults (F1, F2, F3, F4); understand
that they were folded and faulted by localized
overburden stresses resulting from a combination of
differential loading on the deep-seated overpressureductile beneath compacted marine Akata shale and the
gravitational collapse of the Niger Delta continental
slope due to the inflow of sediments. The petrophysical
analyzes have shown that the mean porosity value of the
deposit sand units is in the range of 25, -31%, the mean
permeability values of the deposit sand units are in the
range of 61-1452 mD, the mean slate volume in the range
of 20.5-38.6% lies. The water saturation and
hydrocarbon content of the reservoirs ranged from 15 to
41% and 59 to 85%, respectively. The results of the
study show that the field has good structural and
petrophysical parameters for hydrocarbon potential and
enables hydrocarbon production. The average Original
Oil in Place (OOIP), which is calculated using the
empirical formula method with the petrophysical
parameter, is 29 bbls / STB, while the Stock Tank Oil In
Place (STOIP), the oil volume after production, is 22
bbls / STB . The primary extraction reserve is
20,381,028.23 barrels, which can be extracted with a
primary extraction factor of 10%. The Empirical
forecast approach for hydrocarbon in place is a
substitute and reliable remedial method pending a
qualitative 3D geostatic model technique.
Keywords :
Empirical formulae technique, Porosity, Permeability, Hydrogen Saturation, Primary Recovery.
The 3D seismic intėrpretation and
petrophysical assessment of thė JAKS oil field in the
Niger Dėlta was successfully carried out by performing a
comprehensive structural analysis, reservoir delineation
and volumetric assessment of the field using seismic
data, drilling logs and empirical formulas. The work was
carried out in two stages; seismic data interpretation and
petrophysical data analysis. These phases are combined
to evaluate the hydrocarbon reserves of the reservoir
using the empirical formula approach. The methodology
includes the delineation of lithology from the gamma ray
log, the identification of reservoir fluid types from the
resistivity and the neutron / density combination log,
borehole correlation, horizon and fault mapping from
seismic data, determination of petrophysical parameters
from empirical equations. The reservoirs' original
hydrocarbon stocks were also assessed based on the
weighted averages of porosity, water saturation, gross
rock volume and net to gross ratio. The research shows a
deep structure map with massive, NNW running
anticline, with four associated fold-related synthetic and
antithetical normal faults (F1, F2, F3, F4); understand
that they were folded and faulted by localized
overburden stresses resulting from a combination of
differential loading on the deep-seated overpressureductile beneath compacted marine Akata shale and the
gravitational collapse of the Niger Delta continental
slope due to the inflow of sediments. The petrophysical
analyzes have shown that the mean porosity value of the
deposit sand units is in the range of 25, -31%, the mean
permeability values of the deposit sand units are in the
range of 61-1452 mD, the mean slate volume in the range
of 20.5-38.6% lies. The water saturation and
hydrocarbon content of the reservoirs ranged from 15 to
41% and 59 to 85%, respectively. The results of the
study show that the field has good structural and
petrophysical parameters for hydrocarbon potential and
enables hydrocarbon production. The average Original
Oil in Place (OOIP), which is calculated using the
empirical formula method with the petrophysical
parameter, is 29 bbls / STB, while the Stock Tank Oil In
Place (STOIP), the oil volume after production, is 22
bbls / STB . The primary extraction reserve is
20,381,028.23 barrels, which can be extracted with a
primary extraction factor of 10%. The Empirical
forecast approach for hydrocarbon in place is a
substitute and reliable remedial method pending a
qualitative 3D geostatic model technique.
Keywords :
Empirical formulae technique, Porosity, Permeability, Hydrogen Saturation, Primary Recovery.
