+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

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

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

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.

Accession: 018458393

Related references

E.Sheikh H.A., 1990: Oligocene-Miocene boundaries in some wells in Nile Delta area, Egypt. Annals of the Geological Survey of Egypt 16: 249-253

Sharaf L.M., 2003: Source rock evaluation and geochemistry of condensates and natural gases, offshore Nile Delta, Egypt. Geochemical analyses of mudstones from wells in the NE offshore Nile Delta suggest that the Early Miocene Qantara Formation has "good" potential to generate hydrocarbons at the studied locations. Its generating capability and oil-pronene...

El-Beialy, SY., 1990: Palynology, palaeoecology, and dinocyst stratigraphy of the Oligocene through Pliocene succession in the Qantara-1 Well, eastern Nile Delta, Egypt. Journal of African Earth Sciences, 113-4: 291-307

Kholief M.M.; Shehata M.G., 1994: Sedimentologic features of some Oligocene rock sequences at Nile Valley and Western Desert of Egypt. International Sedimentological Congress 14: G

Khaled K.A.; Sharaf Lobna M.; Awad S.A.; Rashed A.S., 2004: Maturation and source-rock evaluation of mudstone beds in Abu Madi and Kafr El Sheikh Formations, Abu Madi gas field, Nile Delta, Egypt. In this work, the geochemical characteristics of kerogens from mudstone beds in Abu Madi gas field are described. These mudstone samples represent the Late Miocene Abu Madi and Early-Middle Pliocene Kafr El Sheikh formations in Abu Madi gas field...

Heppard Philip D.; Albertin Martin L., 1998: Abnormal pressure evaluation of the recent Pliocene and Miocene gas discoveries from the eastern Nile Delta, Egypt, using 2D and 3D seismic data. The use of interval velocities derived from surface seismic has been an important tool to predict pore pressure at drilling locations in the Nile Delta, and to delineate the distribution of overpressure in the basin. Large accumulations of gas are...

Abdel Fattah T., 1993: Source rock evaluation of the pre-Aptian section at some wells, Matruh sub-basin, northern Western Desert, Egypt. Pages 391-393 1993

Anonymous, 2008: Nile Delta Oligocene find boosts Egypt's gas outlook. Oil & Gas Journal 106.10

Harms J.C.; Wray John L., 1988: Pre-Pliocene history and depositional facies, Nile Delta, Egypt. AAPG Bulletin 72(8): 1005

Abdel-Kireem, MR.; Abdou, HF.; Samir, AM., 1984: Pliocene biostratigraphy and paleoclimatology of the Buseili- 1x well, Nile Delta, Egypt. Neues Jahrbuch fuer Geologie und Palaeontologie Monatshefte, 10: 577-583