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Log-derived source rock evaluation of the Oligocene-Pliocene sequences in some wells, northeast Nile Delta, Egypt


, : Log-derived source rock evaluation of the Oligocene-Pliocene sequences in some wells, northeast Nile Delta, Egypt. Bulletin of the Faculty of Science F, Geology

The shale rock intervals in the Pliocene, Miocene and Oligocene sequences from Rommana-1, Tarif-2A, El Temsah-1 and El Temsah-2 wells located in the NE Nile Delta have been evaluated on the basis of well logging and geothermal measurements. The hydrocarbon richness in the form of total organic carbon (TOC) and organic matter index (OMI) of these intervals were determined by the Delta log R and the dual-porosity dual-water techniques, respectively, using sonic, resistivity and gamma-ray log data. The discriminant analysis was applied in differentiating source from non-source rocks. Also, the effect of the thermal burial history on the organic material maturation and the oil and/or gas generation was studied through the application of three analytical methods, namely, the level of organic metamorphism (LOM), the time-temperature index (TTI) and the maturity level (MAL), depending on the corrected temperature logs integrated with the time and depth data. The reliability of the obtained results has been confirmed with the published results supplied from geochemical analyses. The TOC and OMI values are found in good matching with each other, which performs a confidence to the log-derived methods in previewing the organic matter abundance in source rocks. The TOC and OMI contents within the sediments of the evaluated intervals suggest fair to very good source rocks. Coordination of TOC with the discriminant function (D) indicated that the Pliocene shales could be considered very good to good source rocks in all intervals of Rommana-1 and Tarif-2-A wells, in only 33% of El Temsah-1 and in 48% of El Temsah-2 wells. About 70% of the Miocene shale intervals in Rommana-1 and 80% in Tarif-2A wells are rated as good to very good source rocks, while 40% of El Temsah-1 and 65% of El Temsah-2 Miocene intervals may act as good source rocks. The majority of Oligocene intervals in Tarif-2A, El Temsah-1 and El Temsah-2 wells and about 80% of those in Rommana-1 well may also be rated as good source rocks capable to generate hydrocarbons. On the other hand, the hydrocarbon maturation and generation of the studied intervals as deduced from LOM, TTI and MAL values were found in good correlation with each other. The Pliocene sediments of the studied wells are immature. The Miocene deposits reached the oil maturation level in all wells except in Rommana-1, where they are immature. The shale sediments of the Oligocene kitchen reach the early gas and condensate maturation level in Tarif-2A, El Temsah-1 and El Temsah-2 wells; however they are lying in the oil maturation level in Rommana-1 well.

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