Hydrocarbon Prospecting Over ‘OK’ Field, Niger Delta Using Petrophysical and Seismic Attributes Analysis

Ologe, Oluwatoyin; Bankole, A; Oke, AS

doi:10.4314/njt.v33i3.19

Cited by 5 publications

(7 citation statements)

References 2 publications

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“…The contact between the oil and water (Oil water contact-OWC/Free Water Level) is at a depth of 6670ft. In order to have better understanding of the lithology, reservoir geometry and hydrocarbon accumulation within well A1, core samples, biostratigraphy and seismic data should be integrated for a better understanding of the field as the significant of integrating petrophysical evaluation and seismic interpretation for the planning program is to give a well-articulated exploration data in petroleum prospecting (Ologe et al, 2014). Oil companies should therefore be generous in releasing data to improve the research output of the researchers.…”

Section: Conclusion and Recommendationmentioning

confidence: 99%

Reservoir evaluation of “T-X” field (Onshore, Niger delta) from well log petrophysical analysis

Ologe¹

2017

Bayero J. Pure App. Sci.

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Three wells A1, A2 and A3 were identified on the 'T-X' field in onshore Niger Delta. A comprehensive petrophysical analysis on one of the wells (well A1) was carried out in order to come up with physical properties such as shale volume, porosity (Φ), permeability (K), fluid saturation, and net pay thickness, among others for future development planned of the oil field. A well log data from this field have been examined and analyzed. The logs include gamma ray (used for the identification of lithology), resistivity and porosity logs (used for delineating hydrocarbon bearing reservoirs). Wireline log analysis was employed in the characterization of the reservoirs in the well studied; the hydrocarbon sands were delineated by the use of gamma ray, resistivity and density/neutron from which the reservoir quality were determined. Fluid types defined in the reservoirs on the basis of neutron/density log signatures were basically water, oil and gas.Eighteen (18) reservoirs (AR1 to AR18) were identified, among which twelve (12) are hydrocarbon-bearing reservoirs. Permeability and porosity values range between 1-6206md and 6-28% respectively. Water saturation recorded between 15-100% in the identified reservoirs which indicated that the proportion of void spaces occupied by water varied from low to high values, thus, indicating both low and high hydrocarbon saturation. Plot of hydrocarbon saturation and porosity showed a linear trend and strong linear relationships between permeability and porosity was also observed in all the reservoirs identified indicating that they are permeable and have pores that are strongly interconnected. This study has really demonstrated that petrophysics has a vital role to play in reservoirs characterization.

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Section: Conclusion and Recommendationmentioning

confidence: 99%

Reservoir evaluation of “T-X” field (Onshore, Niger delta) from well log petrophysical analysis

Ologe¹

2017

Bayero J. Pure App. Sci.

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“…Thus, the seismic sections measured on the surface, the boundaries of the different types of rock bodies, and the traces of the faults and fractures are outlined [8]. The faults play a key role in trapping of hydrocarbons [10]. The CRS seismic method can produce a reliable image of a complex geological structure like complex hydrocarbon reservoirs or marine environments [7,9].…”

Section: Seismic Sections and Well Logsmentioning

confidence: 99%

“…To do this, the logs must be inserted into nearby seismic profiles [13]. Seismic profiles provide an almost continuous side view (lateral resolution) below the surface, while the well logs, which are measured with depth, provide a detailed vertical resolution of the geology of the surrounding formations in the vicinity of boreholes [11,10,14]. The resolution of well-logging geophysical sections (Figure 3) is usually 10-20 cm, much finer than that of seismic data, which is approximately 10-20 m [13].…”

Section: Seismic Sections and Well Logsmentioning

confidence: 99%

Improvement of Seismic Sections and Well Logs for Joint Geophysical Interpretation

Kiss

Szabó

Takács

2022

Geosciences and Engineering

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Seismic and well-logging data are useful for comparison and then integratation for a comprehensive geophysical interpretation. In the course of this work, seismic results were compared with well-logging geophysical data and profiles for more reliable evaluation of groundwater formations in the Tokaj region, north-east Hungary. The seismic results and profiles were obtained by the Common Reflection Surface (CRS) stacking technique. This is an advantageous stacking technique that is expected to greatly improve seismic profiles. In connection with this, we also examined some well-logging geophysical profiles so that we can improve later results. By comparing and examining the two types of sections together, we provide a basis for various method developments that improve the sections. Thus, the aim is to fill in the missing data, so that the well-logging and seismic sections can be examined together as accurately as possible in order to gain a more accurate picture of the subsurface formations. It is important to determine the lithology and petrophysical characteristics using well logs. The section replacement the improvement of the units is done using machine learning-based and inversion methods such as factor analysis or cluster analysis. An important outcome in the application of geophysical inversion methods is that the results of different methods can be jointly interpreted and this can significantly increase the reliability of the results. The application of these methods and their development is expected to reduce uncertainty and ambiguity and to increase the accuracy of the sections.

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“…The geometrical attributes are used for structural and stratigraphic interpretations of seismic data (Emujakporue, and Enyenilhi, 2020). It is therefore possible to use seismic attributes to map geological features such as faults (Ologe, and Olowokere, 2021).Seismic attributes are extensively being used in the oil industry to predict subsurface reservoir properties (Srivastava et al, 2003). Several researchers have made enormous contributions based on seismic attributes for enhanced structural and stratigraphic interpretations within the Niger Delta basin to investigate the potentiality of hydrocarbon deposits (Ochoma, et al, 2023;Omoja and Obiekezie, 2019).…”

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confidence: 99%

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confidence: 99%

Seismic Attributes for Enhanced Structural and Stratigraphic Interpretation in Onshore Fuba field, Niger Delta, Nigeria

Ochoma¹

2023

MEJAST

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Seismic attributes for enhanced structural and stratigraphic interpretation of Fuba Field, Onshore Niger Delta, Nigeria using Well-log and 3D Seismic data are here presented. Well-to-Seismic ties, faults and horizon mapping, time-surface generation, depth conversion and seismic attributes generation were carried out using Petrel software. The structural interpretation of seismic data reveal highly synthetic and antithetic faults which are in line with faults trends identified in the Niger Delta. Of the 29 interpreted faults, only synthetic and antithetic faults are regional, running from the top to bottom across the field. These faults play significant roles in trap formation at the upper, middle and lower sections of the field. Two distinct horizons were mapped. Fault and horizon interpretation reveal closures which are collapsed crestal structures bounded by these two major faults. The depth structure maps reveal anticlinal faults. Reservoirs are found at a shallower depth from 6500 to 7500ft and at a deeper depth ranging from 11500 to 13000ft. The synthetic and antithetic faults act as good traps for the hydrocarbon accumulation in the study area. The variance and chaos values range from 0.0 to 1.0. The dip magnitude and azimuth values range from 0 to 90 degrees and 0 to 360 degrees. The variance edge, chaos, dip magnitude and azimuth analysis were used to delineate the prominent and subtle faults in the area. The results of spectral decomposition at a frequency of 12-35Hz indicates areas of low frequency and high amplitude associated with known hydrocarbon zones, the presence of channels, lobes and small scale faults in the field. The result of the seismic attribute analysis has shown that the Fuba field has good hydrocarbon prospects.

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Hydrocarbon Prospecting Over ‘OK’ Field, Niger Delta Using Petrophysical and Seismic Attributes Analysis

Cited by 5 publications

References 2 publications

Reservoir evaluation of “T-X” field (Onshore, Niger delta) from well log petrophysical analysis

Reservoir evaluation of “T-X” field (Onshore, Niger delta) from well log petrophysical analysis

Improvement of Seismic Sections and Well Logs for Joint Geophysical Interpretation

Seismic Attributes for Enhanced Structural and Stratigraphic Interpretation in Onshore Fuba field, Niger Delta, Nigeria

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