Reservoir characterization and prospect identification in Onka field, offshore, Niger Delta

Reservoir characterization and prospect identification in Onka field, offshore, Niger Delta

Olatunbosun O. Kafisanwo Ayodele O. Falade  Olanrewaju V. Bakare  Ayokunle A. Oresanya 

Department of Applied Geophysics, Federal University of Technology, Akure 340252, Nigeria

Department of Geosciences, University of Lagos, Lagos 100213, Nigeria

All Grace Energy Limited, Abuja 900211, Nigeria

Corresponding Author Email:
10 October 2018
30 November 2018
31 December 2018
| Citation



The study is focused on the use of 3D seismic, well logs and checkchots data to delineate, evaluate and characterize reservoirs relating to their hydrocarbon potentials. Four localized wells were available for this study. The study location is Onka field, offshore, Niger Delta. Well correlation and detailed petrophysical analysis was carried out along all the wells. Three reservoirs were discerned within the agbada formation. Among these delineated reservoirs, reservoir 2 occurs to be the most prolific with average gross thickness of about 49ft, net pay thickness of about 43ft, average net to gross thickness of approximately 71%, a good porosity of 20% and hydrocarbon saturation of 81% which is more blatant in well DESLA 1ST2. Seismic interpretation shows the presence of 26 faults. The faulting system corresponds with the geology of the Niger Delta. From the generated structural surface map of Reservoir 2, Fault F7 at the flank of the crest forms an antithetic fault type with both F7A and F7B. This also aligns with the mundane trapping system of the study area. It is recommended that more wells should be drilled at strategic locations to provide more data that will contribute to quality reservoir models.


seismic, reservoir characterization, Niger-Delta, prospect evaluation, petrophysics, Onka field, offshore, geology

1. Introduction
2. Materials and Methodology
3. Location and Geology of Study Area
4. Presentation and Discussion of Results
5. Conclusions

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