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Deriving eU & eTh Concentrations from Total Gamma Ray Logs, A Case Study, Paleozoic Rocks, Gulf of Suez, Egypt |
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PP: 285-294 |
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doi:10.18576/jrna/100310
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Author(s) |
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Ibrahim M. Al-Alfy,
Muhammad Nabih,
Noha M. Hasan,
Ali M. El-Hawary,
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Abstract |
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| Surface gamma-ray spectrometric survey was conducted in the study area (Um Bogma, Southwestern Sinai) along three vertical sections, one meter as a station separation. The gamma-ray spectrometric sections showed different levels in the surveyed rocks, which reflect the radioelement contents of the various exposed rock types. The highest radio-spectrometric levels in Paleozoic rocks are located along the middle carbonate series of the Um-Bogma formation.
From the radio-spectrometric data, a formula was derived to infer the concentrations of the two major radioelements Uranium (eU, ppm) and Thorium (eTh, ppm) in the surface and subsurface of Paleozoic rocks from the measured T.C. gamma-ray in API units. Excellent relationships, very high correlation coefficients (0.98 and 0.96), and very low error are the results of comparing the calculated eU and eTh from total count gamma-ray (in API unit) with the measured eU and eTh concentrations in the Ras-Ghara oil field in three wells. The derived formulas can be used to solve the problem of inferring eU and eTh concentrations in the case of the absence of gamma-ray spectrometric logs.
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