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• W1964733897 abstract "Abstract The gamma ray (GR) tool responds to the amount of radioactive material contained within the rocks adjacent to the borehole. These rocks emit gamma rays with enough energy to get to the detector in the tool. GR log is used for correlation, lithologic identification, and as a shaliness indicator. This is because GR have a high affinity for radioactive mineral like potassium (K40), uranium (UR) and thorium (Th), which are contained in shale and would flag off as a high radioactive count on the log. In contrast, sands are characterized by low radioactive content, giving rise to low GR count. If the sources of the sediments are near-by granitic highlands, the sands and gravel may contain zircon or may be highly arkosic (high feldspar content), with high content of K40. The question in this case is whether or not the natural gamma ray log can be used as a sand/shale or reservoir/non reservoir discriminator and how it impacts on picking reservoir tops and bases for net pay calculation. This paper presents an example of reservoir characterization of radioactive sands from the J5000 reservoir complex of the Bemu field, Niger Delta. It discusses the methodology applied using all available data in the field to fully characterise the reservoir. On the average, radioactive sands make up part of the upper 105ft of the J5000 reservoir complex that is further subdivided into two reservoir zones, J51 and J52, separated by intra-reservoir shale. These two zones form the majority of the productive interval in nearly all the existing 49 wells, with an average porosity of 24 and 26% respectively. Average permeability values of 900 and 1800 mD based on core data-derived equation. Net pay criteria were determined by applying a cut-off to volume of shale (Vshale), generated from a combination of neutron and density log. These methods were further compared to the conventional method of Vshale from GR. Furthermore, Saturation height modelling generated from brine-oil cap-curves was performed which served as an input in calculating in-place hydrocarbon volumes. The results from this study shows that an in-place volume of 114 and 280 MMstb for J51and J52 was achieved using a net-to-gross of 0.79 and 0.89 based on a cut-off on Vsh generated from a combination of Neutron and Density log. In comparison a net-to-gross of 0.47 and 0.46 were estimated by applying a cut-off to Vsh from GR, thus resulting to a lower in-place volume of 70.5 and 144 MMstb for J51 and J52 reservoirs respectively." @default.
• W1964733897 created "2016-06-24" @default.
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• W1964733897 date "2012-08-06" @default.
• W1964733897 modified "2023-09-25" @default.
• W1964733897 title "Petrophysical Characterization of Radioactive Sands - Integrating Well Logs and Core Information: A Case Study in the Niger Delta" @default.
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• W1964733897 doi "https://doi.org/10.2118/163020-ms" @default.
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