11 research outputs found
Investigation of Corrosion of Buried Oil Pipeline by the Electrical Geophysical Methods
The delineation of possible areas of corrosion along an underground oil
pipeline in Ubeji, Delta State, Nigeria was investigated using the
horizontal electrical resistivity profiling technique and the
Spontaneous Potential geophysical method. The resistivity and self
potential values of the soil along the pipeline were obtained using the
R-plus resistivity meter. The results show that areas of low
resistivity, having values between 98.0 and 116.0 Ohm-m, coincide with
areas of high negative spontaneous potential values, in the range -31.0
to -52 mV. The low apparent resistivity and high negative spontaneous
potential values are indications that the soil is very corrosive and
there is the possibility of the pipeline failure and oil spillage
around these hot spots in the future. These methods applied in the
study are quick, economic and efficient for detecting likely anodic hot
spots along buried pipelines which need to be protected. Routine
electrical geophysical investigations along buried oil pipelines should
be undertaken for the early detection and prevention of pipeline
failure with its attendant environmental, human and economic
consequences. @ JASE
Determination of Rocks Elastic constants from Compressional and Shear Waves Velocities for Western Niger Delta, Nigeria.
The elastic properties of sedimentary rocks in the western Niger delta,
Nigeria, have been computed for five oil exploratory wells. The elastic
properties were obtained from the continuous borehole seismic
(compressional and shear waves) velocities and density logs. The
computed Lame\u2019s constants, \ub5 and \u3bb range from 0.02
x1010 to 1.0 x1010 Pa and 0.26 x1010 to 1.3 x1010 Pa respectively. The
computed values of the Young\u2019s modulus, E, range between 0.56
x1010 and 2.53 x1010 Pa. The values of the bulk modulus, K, and
compressibility, \u3b2, vary from 0.64 x1010 to 2.16 x1010 Pa and from
0.11 x 10-11 to 9.4 x10-11 Pa-1 respectively. The values of the bulk
modulus are the largest for all the wells. The calculated values of the
Poisson\u2019s ratio, \u3c3, are between 0.2 and 0.41. The computed
values of the elastic properties show that the rocks encountered in the
wells are soft and poorly sorted. This is a confirmation of the fact
that the wells encountered two major formations (Benin and Agbada
Formations). The Benin Formation is made up of sands with high porosity
while the Agbada Formation is made up of alternations of sands and
shale lithologies. @ JASE
Evaluation of the Hydrocarbon Maturity Level of Oil Well in Sedimentary Basin of the Northern Niger Delta, Nigeria
The hydrocarbon maturation level of Oben-1 well in the northern Niger
Delta sedimentary basin was evaluated using the Lopatin
"Time-Temperature Index (TTI). The result shows that sediments in the
basin are both oil and gas producing with the oil window lying between
the depths of 2.5 to 3.5km. Time of hydrocarbon generation varies from
36 Ma upwards. The hydrocarbon maturation level was estimated for seven
horizons (A, B, C, D, E, F and G), and the results show that horizons
A, B, C and D which are less than 36Ma are non oil and gas producing
(i.e. TTI < 15) while horizons E, F and G which are more than 36Ma
old are both oil and gas producing. This result is in agreement with
the values of Vitrinite reflectance obtained for the well. This study
shows that exploratory wells in the area should be extended beyond the
depth of 3.5kilometres and that the hydrocarbon prospects of the
northern Niger Delta is high. @ JASE
Determination of Rocks Elastic constants from Compressional and Shear Waves Velocities for Western Niger Delta, Nigeria.
The elastic properties of sedimentary rocks in the western Niger delta,
Nigeria, have been computed for five oil exploratory wells. The elastic
properties were obtained from the continuous borehole seismic
(compressional and shear waves) velocities and density logs. The
computed Lame’s constants, µ and λ range from 0.02
x1010 to 1.0 x1010 Pa and 0.26 x1010 to 1.3 x1010 Pa respectively. The
computed values of the Young’s modulus, E, range between 0.56
x1010 and 2.53 x1010 Pa. The values of the bulk modulus, K, and
compressibility, β, vary from 0.64 x1010 to 2.16 x1010 Pa and from
0.11 x 10-11 to 9.4 x10-11 Pa-1 respectively. The values of the bulk
modulus are the largest for all the wells. The calculated values of the
Poisson’s ratio, σ, are between 0.2 and 0.41. The computed
values of the elastic properties show that the rocks encountered in the
wells are soft and poorly sorted. This is a confirmation of the fact
that the wells encountered two major formations (Benin and Agbada
Formations). The Benin Formation is made up of sands with high porosity
while the Agbada Formation is made up of alternations of sands and
shale lithologies. @ JASE
Determination of Rocks Elastic constants from Compressional and Shear Waves Velocities for Western Niger Delta, Nigeria.
The elastic properties of sedimentary rocks in the western Niger delta,
Nigeria, have been computed for five oil exploratory wells. The elastic
properties were obtained from the continuous borehole seismic
(compressional and shear waves) velocities and density logs. The
computed Lame’s constants, µ and λ range from 0.02
x1010 to 1.0 x1010 Pa and 0.26 x1010 to 1.3 x1010 Pa respectively. The
computed values of the Young’s modulus, E, range between 0.56
x1010 and 2.53 x1010 Pa. The values of the bulk modulus, K, and
compressibility, β, vary from 0.64 x1010 to 2.16 x1010 Pa and from
0.11 x 10-11 to 9.4 x10-11 Pa-1 respectively. The values of the bulk
modulus are the largest for all the wells. The calculated values of the
Poisson’s ratio, σ, are between 0.2 and 0.41. The computed
values of the elastic properties show that the rocks encountered in the
wells are soft and poorly sorted. This is a confirmation of the fact
that the wells encountered two major formations (Benin and Agbada
Formations). The Benin Formation is made up of sands with high porosity
while the Agbada Formation is made up of alternations of sands and
shale lithologies. @ JASE
Investigation of Corrosion of Buried Oil Pipeline by the Electrical Geophysical Methods
The delineation of possible areas of corrosion along an underground oil
pipeline in Ubeji, Delta State, Nigeria was investigated using the
horizontal electrical resistivity profiling technique and the
Spontaneous Potential geophysical method. The resistivity and self
potential values of the soil along the pipeline were obtained using the
R-plus resistivity meter. The results show that areas of low
resistivity, having values between 98.0 and 116.0 Ohm-m, coincide with
areas of high negative spontaneous potential values, in the range -31.0
to -52 mV. The low apparent resistivity and high negative spontaneous
potential values are indications that the soil is very corrosive and
there is the possibility of the pipeline failure and oil spillage
around these hot spots in the future. These methods applied in the
study are quick, economic and efficient for detecting likely anodic hot
spots along buried pipelines which need to be protected. Routine
electrical geophysical investigations along buried oil pipelines should
be undertaken for the early detection and prevention of pipeline
failure with its attendant environmental, human and economic
consequences. @ JASE
Structural and seismic sequence stratigraphy analysis of seismic and biostratigraphy data from an onshore field, Niger Delta, Nigeria
The structural and sequence stratigraphy of a Niger Delta onshore field has been analysed from seismic and biostratigraphy data in order to assess the hydrocarbon potential of the area. Seven faults F1, F2, F3, F4, F5, F6 and F7 were delineated in the seismic sections. The faults, F1, F4, F6 and F7 are synthetic faults, while F2, F3 and F5 are antithetic. Two horizons H1 and H2 were identified in the seismic sections within the time window of 2200-2600 ms. The seismic sequence stratigraphy analysis revealed five sequence boundaries S1, S2, S3, S4 and S5, which represent four depositional sequences. Four maximum flooding surfaces (MFS) were also delineated in the seismic data. The analysis of the biostratigraphy data thus revealed four sequence boundaries (S1, S2, S3, S4) and three maximum surfaces (MFS1, MFS2 and MF3). The age of the sequence boundary ranges from 13.1Ma to 8.3 Ma. The age of the observed maximum flooding surfaces ranges from 12.8 Ma to 9.4 Ma. In vertical succession, the depositional sequences were identified by the order; sequence boundary, lowstand system tract (LST), Transgressive system tract (TST), Maximum flooding surface (MFS), and Highstand system tract (HST). The lowstand system tract is made up of stacking pattern of sand, while the transgressive system tract thinned into the condense section
Reservoir Static Modelling towards Safe CO2 Storage in Depleted Oil Reservoirs of ‘CRK’ Field, Niger Delta, Nigeria
Geological carbon storage (GCS) is gradually gaining acceptance as the technology of highest repute for the mitigation against greenhouse gas effect. This involves the injection and long-term or permanent storage of carbon dioxide (CO2) in subsurface geological formations. The development of a robust 3D reservoir model then becomes necessary to understand the facies changes and the petrophysical properties distribution of candidate CO2 storage reservoirs. This study attempts the use of static modelling technique to investigate the depleted oil and gas reservoirs of ‘CRK’ field in the Niger Delta sedimentary Basin as a potential CO2 storage site. Using an integrated approach of 3D seismic and a suit of well logs from the study area, two reservoir sands (D10C0 and D6200) were mapped. 3D static modelling of discrete and continuous property distribution of the reservoirs revealed the reservoirs are composed majorly of clean sands with water saturation ranging from 8 to 75%. The average porosity and permeability values are between 20 to 29% and 250 to 890mD respectively. A theoretical storage capacity of 24.85Mt is estimated for the two reservoirs combined, while the median effective storage capacity is 6.22Mt. Comparison of the results obtained in the study with recommended standard values show the reservoirs are suitable for CO2 storage. The property models constructed can serve as primary input for dynamic simulation of the oilfield in future studies
Evaluation of the Hydrocarbon Maturity Level of Oil Well in Sedimentary Basin of the Northern Niger Delta, Nigeria
The hydrocarbon maturation level of Oben-1 well in the northern Niger
Delta sedimentary basin was evaluated using the Lopatin
"Time-Temperature Index (TTI). The result shows that sediments in the
basin are both oil and gas producing with the oil window lying between
the depths of 2.5 to 3.5km. Time of hydrocarbon generation varies from
36 Ma upwards. The hydrocarbon maturation level was estimated for seven
horizons (A, B, C, D, E, F and G), and the results show that horizons
A, B, C and D which are less than 36Ma are non oil and gas producing
(i.e. TTI < 15) while horizons E, F and G which are more than 36Ma
old are both oil and gas producing. This result is in agreement with
the values of Vitrinite reflectance obtained for the well. This study
shows that exploratory wells in the area should be extended beyond the
depth of 3.5kilometres and that the hydrocarbon prospects of the
northern Niger Delta is high. @ JASE