International Journal of Research and Innovation in Applied Science (IJRIAS) |Volume VII, Issue X, October 2022|ISSN 2454-6194

Petrophysical Evaluation of Hydrocarbon Potential of “OMA” Field, Niger Delta

Olarewaju Modupe Abayomi¹, Osisanya O Wasiu²*, Korode A Isaac³, Ibitoye T Abel⁴.
¹Department of Applied Geophysics, Federal University of Technology, Akure, Ondo State, Nigeria.
²Department of Physics, University of Benin, Benin City, Edo state, Nigeria.
³,⁴Department of Petroleum Engineering and Geosciences, Petroleum Training Institute, Effurun, Nigeria.
*Corresponding Author

Abstract: The goal of this study is to maximize hydrocarbon reserves by evaluating reservoirs using derived petrophysical parameters, a common practice in the oil and gas industry. In order to complete this task, data (logs) from three Niger Delta onshore wells (OMA01, OMA02, and OMA 03) were used. Gamma-ray, resistivity, and neutron-density well logs were used in this study for lithology identification, fluid delineation, and hydrocarbon identification. Petrel and Rokdoc software were used for lithology identification and petrophysical analysis computation. The qualitative analysis revealed that the wells drilled through various lithologies contained sand and shale intercalations. Three in WellOMA01, Four in WellOMA02, and Two in WellOMA03, reservoirs were delineated. The field’s petrophysical analysis was also produced. Shale’s volume varies from 10% to 24%, its porosity from 14% to 26%, and its water saturation from 16% to 53%, while its permeability was relatively high. The highest hydrocarbon saturation (84%) was found in RES 01 from WellOMA03. The “OMA” field study revealed that there is a sizably high potential for hydrocarbons.

Keywords: Hydrocarbon, Lithology, Well, Reservoirs, Log, Nigeria

I. INTRODUCTION

The information found in well log data is one crucial component of exploration geophysics that complements earlier data acquisition (wire line data). Well logging is the process of meticulously documenting the geological formations that the well has drilled through. In Alsace, France, the Schlumberger brothers invented the geophysical well logging technique in 1927 (Schlumberger, 1982; 1989). In order to log, either samples are brought to the surface for visual inspection (geological logs, such as cuttings logs, core-logging, or petro-physical logs), or physical measurements are taken using equipment lowered into the hole (geophysical logs) (Asquith, 1982; Teama and Nabawy, 2016). The formations are exposed to well-bore immediately after the well is drilled. One of the most effective and crucial tools for characterization of reservoir rock is the petrophysical analysis of well logs. Petrophysical characteristics, such as lithology, porosity, water saturation, permeability, and saturation, affect the productivity of wells in hydrocarbon-bearing reservoirs (Al-Ruwaili and Al-Waheed, 2014; Alao, et al., 2013, Osisanya et al., 2021). The process of using borehole measurements to evaluate the properties of subsurface formations is known as formation evaluation in the context of this petrophysics framework (Lyaka and Mulibo, 2018

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