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Thorium-Normalized Airborne Radio- Spectrometric Data Technique , As A Guide To The Recognition Of Probable Subsurface Petroleum Accumulations, West Qasr Elfarafra Area, Western Desert , Egypt |
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PP: 29-33 |
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doi:10.18576/jrna/080105
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Author(s) |
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Abd El Rahman R M,
El Hawary A.,
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Abstract |
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| Thourium normalization is a technique using surface and aerial gamma-ray spectral measurements in prospecting for petroleum in stratigraphic and structural traps. West Qasr El-farfra area, Central Western Desert, Egypt, was selected to apply this method on its recorded aerial gamma-ray spectrometric survey data, due to its distinct stratigraphic and structural setting as well as its situation with new discovered oil production fields in Egypt. Thorium normalization technique was first applied on well logging data by [1] who concluded that the results of thorium normalization agree with the results of well log analysis on the Lower Miocene (Rudeis) Formation in Belayim marine oil field in 82% of the cases studied. The three variables (eU, eTh, and K) registered for the whole study area, in the form of three contour maps, The DRAD arithmetic means plus two standard deviations for the data set were computed. Any single DRAD •value greater than this quantity should have a probability of 95% that it represents a valid anomaly and is not caused by random variations in the background values. The application of these criteria has led to the identification of five zones over the investigated area that is statistically valid. These might indicate a prospective possibility for feasible subsurface hydrocarbon accumulations and oil-bearing pay zones at west qasr elfarfra area. |
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