Characterization of the reservoir potential of the H-T field, Walvis basin, offshore Namibia

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Date
2024
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Publisher
University of Namibia
Abstract
The Walvis Basin, renowned for its hydrocarbon potential, has long attracted the attention of the oil and gas industry. However, effective reservoir characterization remains a critical challenge, influencing exploration and development strategies. This study addresses the need for detailed reservoir characterization and its role in enhancing hydrocarbon prospectivity in the H-T field of the Walvis Basin. The impetus motivating this research is the lack of comprehensive reservoir characterization, leading to uncertainties in the distribution of hydrocarbon-bearing zones and their petrophysical properties. A study of reservoir characterization using well logs has been conducted to address the above-mentioned problem. Four wells in the H-T field were selected for analysis, and an array of well logs, including gamma ray, resistivity, neutron, and density logs, was employed to evaluate the petrophysical properties of identified reservoir rocks. The Interactive Petrophysics software facilitated the systematic evaluation of these properties. The gamma ray log was harnessed for lithologic discrimination, enabling the identification of discrete reservoir formations. The resistivity log played a pivotal role in determining the nature of formation fluids based on the electrical responses of reservoir formations. Furthermore, the combined analysis of density and neutron logs was instrumental in estimating reservoir porosity and identifying the presence of hydrocarbons where applicable. The results of this study unveiled the presence of three water-bearing reservoirs in Well HT3 namely Y1, Y2 and Y3 with thicknesses of 55.47 m, 5.03 m, and 10.52 m, respectively. Additionally, reservoir correlation, facilitated by the gamma ray log, revealed a discontinuous distribution of reservoirs across the wells. Furthermore, a cross-plot analysis of water saturation and porosity unveiled variations in grain size, ranging from fine-grained to silty sands within the reservoirs. This research significantly contributes to the understanding of reservoir characteristics, their distribution, and hydrocarbon prospectivity in the H-T field of the Walvis Basin. It provides essential insights for future exploration and production endeavors, offering a more informed approach to hydrocarbon resource assessment and development in the region.
Description
A thesis submitted in fulfilment of the requirements for the Master of Science in Petroleum Geosciences
Keywords
Walvis Basin, Reservoir characterization, Well logs interpretation, Hydrocarbon prospectivity, University of Namibia, Namibia
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