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Evaluation of depositional environments and reservoir quality of sediments in “OLI” field, offshore, Niger Delta, Nigeria

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Abstract

The evaluation of environments of deposition and reservoir quality of sediments in the “OLI” field, offshore Niger Delta, Nigeria, was done using a suite of wireline logs from five (5) different wells, one analogue well, and core data. The “OLI” field is an important hydrocarbon-producing area in the Niger Delta region of Nigeria. The objective of this study is to analyze the depositional environments and reservoir quality of the sediments. This will aid in the optimization of hydrocarbon extraction and the identification of new exploration targets. The lithofacies were interpreted by a systematic description of their petrographic features from core data, while the inferred lithology and depositional environments were deduced from the characteristics of the log motifs. The reservoir quality of the different sand bodies was determined from the petrophysical parameters’ interpretation obtained from both log and core data. The results revealed that the rock properties were variable and were controlled by successive depositional environments that occurred during the Oligocene–Late Miocene. Three lithofacies (sand, silt, and shale) and six sub-lithofacies (ranging from coarse-grained sand to shale) were delineated based on the relationship between grain size and the bulk volume of water. The results of gamma ray log motif and core analyses revealed the sandstones to have been deposited in a broad environment of fluvio-deltaic plain, deltaic front, and open-shelf margin/slope. Five reservoir sand units were identified. Reservoir sands were found to occur from 1800 to 4000 m. The porosities of reservoir sands, which ranged from 14.29 to 22.5%, were interpreted as excellent for hydrocarbon reservoirs. Their permeabilities have an average field range value of 43.95 to 121.68 mD and were interpreted as excellent for hydrocarbon reservoirs. Hydrocarbon saturation was high in all the reservoir sands, ranging from 70.65 to 80.28%, with corresponding water saturation also ranging from 19.72 to 29.35%. Water saturations were irreducible for reservoir sands C, D, and E. The field is predominantly an oil field because gas only occurs in sand E. The reservoir quality of the “OLI” field was found to be excellent for hydrocarbon reservoirs.

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Acknowledgements

Nigeria Agip Oil Company (NAOC), Lagos, for sponsoring my postgraduate program and Nigeria Agip Exploration Limited, Portharcourt, for providing the data set used in this project. I equally acknowledge, with a deep sense of appreciation, Esso Exploration and Production Nigeria Limited (EEPN), Lagos, for donating the workstation and Schlumberger Nigeria Limited, Lagos, for donating the software to the Department of Geology, Federal University Technology, Owerri, where the analysis of the project was done.

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Authors and Affiliations

  1. Department of Geology, Federal University of Technology, Owerri, 460114, Nigeria

    Onyekuru Samuel Okechukwu, Nnagha Joan Oluchi & Iwuagwu Julian Chukwuma

  2. Geookan Nigeria Limited, Akwa Ibom State, Eket, 521103, Nigeria

    Agbasi Okechukwu Ebuka

  3. Department of Physics, Michael Okpara University of Agriculture, Abia State, Umudike, 7267, Nigeria

    Agbasi Okechukwu Ebuka

  4. Department of Oil and Gas Technologies, Perm National Research Polytechnic University, Perm, 614990, Russia

    Dmitriy A. Martyushev

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  1. Onyekuru Samuel Okechukwu
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  2. Nnagha Joan Oluchi
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  3. Agbasi Okechukwu Ebuka
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  4. Dmitriy A. Martyushev
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  5. Iwuagwu Julian Chukwuma
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Contributions

Onyekuru Samuel Okechukwu: data curation, revision and editing of the manuscript. Nnagha Joan Oluchi: data curation, methodology, investigation, writing the original draft. Agbasi Okechukwu Ebuka: electron microscopy studies, discussion and analysis of results, revision and editing of the manuscript. Dmitriy A. Martyushev: electron microscopy studies, revision and editing of the manuscript. Iwuagwu Julian Chukwuma: methodology, revision and editing of the manuscript.

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Correspondence to Dmitriy A. Martyushev.

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Okechukwu, O.S., Oluchi, N.J., Ebuka, A.O. et al. Evaluation of depositional environments and reservoir quality of sediments in “OLI” field, offshore, Niger Delta, Nigeria. Arab J Geosci 16, 138 (2023). https://doi.org/10.1007/s12517-023-11250-2

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