Geochemical Characterization of Condensates and Gases in Abu Qir Concession in the Western Offshore, Nile Delta, Egypt

Document Type: Research Paper


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In this study, biomarker analyses were conducted on four condensate samples recovered from Kafr El Sheikh and Abu Madi Reservoirs in Abu Qir concession, NW offshore Nile Delta. Moreover, according to the obtained results, it was indicated that the condensates are genetically related, and they were derived mainly from clay-rich source rocks of mixed organic sources, with significant input of terrestrial organic sources, deposited in low saline fluvio-deltaic environment. These conclusions are supported by the relative abundance of both C29 and C27 regular steranes, high diasteranes, and Pr /Ph ratios and the lowC29norhopane relative to C30hopane, low isoprenoids/n-alkanes ratios and lack of gammacerane. In addition, biomarker maturity indicators suggested that the condensates were sourced from early mature source rocks. Finally, geochemical and isotopic data from gases indicated that Abu Qir gases are of thermogenic origin generated from source rocks with mixed types II/III kerogens. 


Younes M. A., “Geochemical Characteristics of Natural Gas Formation in the Offshore Nile Delta, Egypt,” Oil-Gas European Magazine, 2010, 36(4), 194-199.
Said R., “The geology of Egypt (1st ed.),”  Rotterdam, Netherland, 1990, 743.
Sarhan M., Barsoum F., Bertello F., Talaat M., and et al., “The Pliocene Play in the Mediterranean Offshore: Structural Setting and Growth Faults Controlled Hydrocarbon Accumulations in the Nile Delta Basin: A Comparison with the Niger Delta Basin,” 13th EGPC, Cairo, 1996, 1, 1–19.
Helmy M. and Fouad O., “Prospectivity and Play Assessment of Abu Qir Area, Nile Delta, Egypt,” EGPC, 12th Petroleum Exploration and Production Conference, Cairo, 1994, 1, 276–292.
Halim A. A., Fouad O., Worku T., Khaled A. A., and et al., “Aspects of Reservoir Potential of the Miocene-Pliocene Sequences in North Alexandria and the Surrounding areas, Offshore Nile Delta, Egypt,” 13th Petroleum Exploration and Production Conference, Cairo, 1996, 1, 224-241.
Sharaf L. M., “Source Rock Evaluation and Geochemistry of Condensates and Natural Gases, Offshore Nile Delta, Egypt,” Journal of Petroleum Geology, 2003, 26(2), 189-209.
El-Nady M. M., “Origin and Composition of Liquid Hydrocarbons and Natural Gases of Some Wells in the Offshore Nile Delta, Egypt,” Egyptian Journal of Petroleum, 2006, 15(2), 61- 75.
Leila M. and Moscariello A., “Organic Geochemistry of Oil and Natural Gas in the West Dikirnis and El Tamad fields, Onshore Nile Delta, Egypt: Interpretation of Potential Source Rocks,” Journal of Petroleum Geology, 2017, 40(1), 37-58.
Monir M. and Shenkar O., “Pre-Messinian Petroleum System and Trapping Style, Offshore Western Nile Delta, Egypt,” AAPG/SPE Africa Energy and Technology Conference, Nairobi City, Kenya, 2017, 5-7.
Omran A., “Deep Thermal Trends and Hydrocarbon Maturity Level Determination Using Bottom Hole Temperature Measurements in the Nile Delta,” 1st International Symposium on the Deltas, Modern and Ancient, Cairo, Egypt, 2001, 185-208.
El-Heiny I. and Morsi S., “Stratigraphic  Correlation of Neogene Sediments in the  Eastern Nile Delta and Gulf of Suez, Egypt,”  11th Petroleum Exploration and Production Conference of EGPC, 1992, 11(2), 166-193.
EGPC (Egyptian General Petroleum Corporation), “Nile Delta and North Sinai. Fields, Discoveries and Hydrocarbon Potentials (A Comprehensive Overview),” EGPC, Cairo, Egypt, 1994, 387. 
Huang W. Y. and Meinschein W. G., “Sterols as Ecological Indicators,” Geochimical et Cosmochimical Acta, 1979, 43, 739-745. 
Peters K. E. and Moldowan J. M., “The Biomarker Guide, Interpreting Molecular Fossils in Petroleum and Ancient Sediments (1st ed.),” Prentice Hall, 1993, 363.
Shanmugam G., “Significance of Coniferous Rain Forests and Related Oil, Gippsland Basin, Australia,” AAPG Bulletin, 1985, 69, 1241-1254.
Hughes W., Holba A., and Dzou L., “The Ratios of Dibenzothiophene to Phenanthrene and Pristane to Phytane as Indicators of Depositional Environment and Lithology of Petroleum Source Rocks,” Geochimical et Cosmochimical Acta, 1995, 59, 3581-3598. 
Mango F. D., “The Origin of Light Hydrocarbons in Petroleum: Ring Preference in the Closure of Carbocyclic Rings,” Geochimical et Cosmochimical Acta, 1994, 58, 895-901. 
Sofer Z., “Stable Carbon Isotope Compositions of Crude Oils: Application to Source Depositional Environments and Petroleum Alteration,” AAPG Bulletin, 1984, 68, 31-49. 
Waples D. W. and Machihara T., “Biomarkers for Geologists: A Practical Guide to the Application of Steranes and Triterpanes in Petroleum Geology,” AAPG Methods in Exploration, 1991, 9, 91.
Moldowan J. M., Seifert W. K., and Gallegos E. J., “Relationship between Petroleum Composition and Depositional Environment of Petroleum Source Rocks,” AAPG Bulletin, 1985, 69, 1255-1268. 
Peters K. E., Fraser T. H., Amris W., Rustanto B., and Hermanto E., “Geochemistry of crude oils from eastern Indonesia,” AAPG Bulletin, 1999, 83, 1927-1942.
Philp R. P. and Gilbert T. D., “Biomarker Distributions in Oils Predominantly Derived from Terrigenous Source Material,” Advances in Organic Geochemistry, Oxford, Pergamon Press, 1986, 73-84.
Abdullah W. H., Murchinson D., Jones J. M., Telnaes N., and et al., “Lower Carboniferous Coal Depositional Environments on Spitsbergen, Svalbard,” Advances in Organic geochemistry, New York, Pergamon, 1988, 953-965. 
Mello M. R., Gaglianone P. C., Brassell S. C., and Maxwell J. R., “Geochemical and Biological Marker Assessment of Depositional Environment Using Brazillian Offshore Oils,” Marine and Petroleum Geology, 1988, 5, 205-223. 
Murray A. P., Summons R. E., Boreham C. J., and Dowling L. M., “Biomarker and N-alkane Isotope Profiles for Tertiary Oils: Relationship to Source Rock Depositional Setting,” Advances in organic geochemistry, Organic Geochemistry, 1994, 22, 521-542. 
Guzman-Vega M. A. and Mello M. R., “Origin of Oil in the Sureste Basin, Mexico,” AAPG Bulletin, 1999, 83, 1068-1095. 
Czochanska Z., Gilbert T. D., Philip R. P., Sheppard C. M., and et al., “Geochemical Application of Sterane and Triterpane Biomarkers to a Description of Oils from the Taranaki Basin in New Zealand,” Organic Geochemistry, 1988, 12, 123-135. 
Van Aarssen B. G. K., Cox H. C., Hoogendoorm P., and De Leeuw J. W., “A Cadinene Biopolymer in Fossil and Extant Dammar Resins as a Source for Cadinanes and Bicadinanes in Crude Oils from South East Asia,” Geochimical et Cosmochimical Acta, 1990, 54, 3021-3031.
El-Diasty W. S. and Moldowan J. M., “The Western Desert Versus Nile Delta: A Comparative Molecular Biomarker Study,” Marine and Petroleum Geology, 2013, 46, 319-334. 
Connan J., Bouroullec J., Dessort T. D., and Albrecht P.,” The Microbial Input in Carbonate-anhydrite Facies of a Sabkha Paleoenvironmental from Guatemala; A Molecular Approach,” Advances in Organic Geochemistry, Oxford, Pergamon, 1986, 20-50.
Mann A. L., Goodwin N. S., and Lowe S., “Geochemical Characteristics of Lacustrine Source Rocks: a Combined Palynological/molecular Study of a Tertiary Sequence from Offshore China. Proc. Indonesian Petroleum Association,” 16th Annual Convention, Jakarta, Indonesian Petroleum Association, 1987, 1, 241-258.
Zumberge J. E., “Source Rocks of the La Luna Formation (Upper Cretaceous) in the Middle Magdalena Valley, Colombia, In: Palacas J. G., (Editor): Geochemistry and Source Rock Potential of Carbonate Rocks,” AAPG Studies in Geology, 1984, 18, 127-133.
Haworth J., Sellens A., and Whittaker A., “Interpretation of Hydrocarbon Shows Using Light (C1-C5) Hydrocarbon Gases from Mud- Log Data,” AAPG Bulletin, 1985, 69, 1305-1310.
Bernard B. B., “Light Hydrocarbons in Marine Sediments,” Ph.D. thesis, Texas A&M University, 1978, 144. 
Faber E. and Stahl W., “Geochemical Surface Exploration for Hydrocarbons in the North Sea,” AAPG Bulletin, 1984, 68, 363–386
Berner U. and Faber E., “Empirical Carbon Isotope/maturity Relationships for Gases from Algal Kerogens and Terrigenous Organic Matter, Based on Dry, Open-system Pyrolysis,” Organic Geochemistry, 1996, 24, 947-955.
Thompson K. F. M., “Fractionated Aromatic Petroleums and the Generation of Gas-Condensates,” Organic Geochemistry, 1987, 11, 573-590
Thompson K. F. M., “Gas-condensate Migration and Oil Fractionation in Deltaic Systems,” Marine and Petroleum Geology, 1988, 5, 237-246.