Abstract
Recognition of reservoir quality is an important objective in reservoir characterization process. By definition, the quality of a reservoir is described by its hydrocarbon storage capacity and deliverability. The storage capacity is a function of porosity, whereas deliverability is a function of permeability. Thus, both porosity and permeability are the main reservoir quality controlling factors. Five wells were selected to study the reservoir quality of the Nubia sandstone in the Gulf of Suez, Egypt. The Nubia interval, deposited in continental to shallow marine conditions, consists mainly of sandstone intercalated by thin layers of shale. Three wells were partially cored and the other two wells are completely uncored. Based on several complementary techniques, it is concluded that the Nubia sandstone is of moderate to extremely heterogeneous quality. The porosity–permeability cross-plot showed fair-to-medium relationship, indicating the significant role of diagenetic agents. The Nubia reservoir quality has been enhanced principally by fracturing, dissolution and leaching. However, the reservoir quality decreased by cementation, compaction and filling of pore spaces by kaolinite. Based on principal component and cluster analyses, six electrofacies are recognized within the Nubia interval. Three electrofacies are dominant, whereas the other three are subsidiary. Flow zone indicator (FZI) was determined based on mean hydraulic radius and normalized porosity. Correlation between electrofacies and FZI permits discriminating the subject formation into reservoir quality ranks. The relative complexity of this reference formation notwithstanding, because of the robustness of the resulting electrofacies–FZI correlations, it was relatively straightforward to recognize and reasonably predict the reservoir quality of the uncored intervals.
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig1_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig2_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig3_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig4_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig5_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig6_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig7_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig8_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig9_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig10_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig11_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig12_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig13_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig14_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig15_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig16_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig17_HTML.png)
![](http://media.springernature.com/m312/springer-static/image/art%3A10.1007%2Fs11053-018-9447-7/MediaObjects/11053_2018_9447_Fig18_HTML.png)
Similar content being viewed by others
References
Abbaszadeh, M., Fujii, H., & Fujimoto, F. (1996). Permeability prediction by hydraulic flow units—theory and applications. SPE Formation Evaluation, 11(4), 263–271.
Abdel-Wahab, A. A. (1992). Provenance of Gebel El Zeit sandstones, Gulf of Suez. Egypt. Sedimentary Geology, 75, 241–251.
Abdel-Wahab, A. A., Allam, A., Kholief, M. M., & Salem, A. M. (1992). Sedimentological and paleoenvironmental studies on Gebel El-Zeit, Gulf of Suez. Egypt. Journal of African Earth Sciences, 14, 121–129.
Abed, A. A. (2014). Hydraulic flow units and permeability prediction in a carbonate reservoir, Southern Iraq from well log data using non-parametric correlation. International Journal of Enhanced Research in Science Technology & Engineering, 3(1), 480–486.
Al-Dhafeeri, A. M., & Nasr-El-Din, H. A. (2007). Characteristics of high-permeability zones using core analysis, and production logging data. Journal of Petroleum Science and Engineering, 55, 18–36.
Allam, A. (1988). A lithostratigraphical and structural study on Gebel El-Zeit area. Journal of African Earth Sciences, 7, 933–944.
Alsharhan, A., & Salah, M. (1997). Lithostratigraphy, sedimentology and hydrocarbon habitat of the Pre-Cenomanian Nubian sandstone in the Gulf of Suez oil Province. Egypt. GeoArabia, 2(4), 385–400.
Amaefule, J., Altunbay, M., Tiab, D., Kersey, D., & Keelan, D. (1993). Enhanced reservoir description using core and log data to identify hydraulic flow units and predict permeability in uncored intervals/wells. Society of Petroleum Engineers, 26436, 205–220.
Byrnes, A. P., (1994). Prediction of Permeability and Capillary Pressure. In Wilson, M. D. (Ed), Reservoir quality assessment and prediction in clastic rocks. SEPM Society for Sedimentary Geology 30: 349-355.
Corbett, P. W. M., & Potter, D. K. (2004). Petroty**: A base map and atlas for navigating through permeability and porosity data for reservoir comparison and permeability prediction. In International Symposium of the Society of Core Analysts.
Doveton, J. H. (1994). Geologic log analysis using computer methods. Computer applications in geology (2nd ed.). Tulsa: AAPG.
Doveton, J. H. (2014). Principles of mathematical petrophysics. Oxford: Oxford University Press.
Dykstra, H., & Parsons, R. L. (1950). The prediction of oil recovery by waterflooding. Secondary Recovery of Oil in the United States (2nd ed., pp. 160–174). Washington, DC: API.
El Sharawy, M. S. (2001). Geology and tectonic of Younis and Nessim oilfields, Gulf of Suez. Mansoura: Mansoura University.
El Sharawy, M. S. (2006). Seismic and well log data as an aid for evaluating oil and gas reservoirs in the southern part of the Gulf of Suez, Egypt. In Ph.D. dissertation. Mansoura University, Egypt.
El Sharawy, M. S., & Nabawy, B. S. (2016a). Geological and petrophysical characterization of the lower Senonian Matulla formation in Southern and Central Gulf of Suez, Egypt. Arabian Journal for Science and Engineering, 41(1), 281–300.
El Sharawy, M. S., & Nabawy, B. S. (2016b). Determination of electrofacies using wireline logs based on multivariate statistical analysis for the Kareem Formation, Gulf of Suez, Egypt. Environmental Earth Sciences, 75(21), 1394.
El Sharawy, M. S., & Nabawy, B. S. (2018). Determining the porosity exponent m and lithology factor a for sandstones and their control by overburden pressure: A case study from the Gulf of Suez. Egypt. AAPG Bulletin, 102(9), 1893–1910.
Elphick, R., & Moore, R. (1999). Permeability calculations from clustered electrofacies, a case study in Lake Maracaibo, Venezuela. In: 40th SPWLA annual symposium, Oslo, Norway.
El Heiny I., Enani, N., & Abdou, I. (1998). Structural and stratigraphic interpretation of a new Nubian sandstone oil reservoir, Gulf of Suez, Egypt. In 14th EGPC Exploration and Production Conference (Vol. 1, pp. 466–491).
Gameel, M., & Darwish, M. (1994). Reservoir behavior of the Pre- Turonian sandstones in south Gulf of Suez province (Sidki field—case history). In 12th EGPC Exploration and Production Conference (Vol. 2, pp. 449–471).
Guo, G., Diaz, M. A., Paz, F. J., Smalley, J., & Waninger, E. A. (2007). Rock ty** as an effective tool for permeability and water-saturation modeling: A case study in a clastic reservoir in the Oriente basin. Society of Petroleum Engineers Reservoir Evaluation & Engineering, 10(6), 730–739.
Hermina, M., Klitzsch, E., & List, F. R. (1989). Stratigraphic Lexicon and Explanatory Notes to the Geological Map of Egypt 1: 500 000. Cairo: Conoco Inc.
Issawi, B., El-Hinnawi, N., Khawaga, L., Labib, S., & Anani, N. (1981). Contributions to the geology of Wadi Feiran area, Sinai (p. 48). Petrobel internal Report: Egypt.
Kassab, M. A. M., Abu Hashish, M., Nabawy, B. S., & El-Nagar, O. (2017). Effect of the kaolinite content on porosity, permeability and capillary pressure derived parameters, Nubia sandstone, Wadi Kareem, Eastern Desert. Egypt. Journal of African Earth Sciences, 125, 103–117.
Klitzsch, E., & Squyres, C. H. (1990). Paleozoic and Mesozoic geologic history of northeastern Africa based upon new interpretation of Nubia strata. AAPG Bulletin, 74, 1203–1211.
Kolodzie, Jr. S. (1980). Analysis of pore throat size and use of the Waxman-Smits equation to determine OOIP in Spindle field, Colorado: Society of Petroleum Engineers. In 55th Annual Fall Technical Conference, Society of Petroleum Engineers Paper No. 9382, 10.
Kora, M. (1984). The Palaeozoic outcrops of Um-Bogma area, Sinai, Egypt. In Ph.D. Thesis, Mansoura University, Mansoura.
Lee, S.H., & Datta-Gupta, A. (1999). Electrofacies characterization and permeability predictions in carbonate reservoirs: role of multivariate analysis and non-parametric regression. Society of Petroleum Engineers -56658-MS, 13.
Morris, R.L., & Biggs, W.P. (1967). Using log-derived values of water saturation and porosity: Society of Professional Well Log Analysts Annual Logging Symposium 26.
Moss, B. (1997). The partitioning of petrophysical data: a review. In H. Lovell (Ed.), Developments in petrophysics (Vol. 122, pp. 181–252). London: Geological Society Special Publication.
Nabawy, B. S. (2014). Estimating porosity and permeability using digital image analysis (DIA) technique for highly porous sandstones. Arabian Journal of Geosciences, 7(3), 889–898.
Nabawy, B. S. (2015). Impacts of the pore- and petro-fabrics on porosity exponent and lithology factor of Archie’s equation for carbonate rocks. Journal of African Earth Sciences, 108, 101–114.
Nabawy, B. S., & Al-Azazi, N. A. S. (2015). Reservoir zonation and discrimination using the routine core analyses data: the upper Jurassic Sab’atayn sandstones as a case study, Sab’atayn basin, Yemen. Arabian Journal of Geosciences, 8(8), 5511–5530.
Nabawy, B. S., & Barakat, M. Kh. (2017). Formation Evaluation using conventional and special core analyses: Belayim formation as a case study, Gulf of Suez, Egypt. Arabian Journal of Geosciences, 10(25), 1–23.
Nabawy, B. S., Basal, A. M. K., Sarhan, M. A., & Safa, M. G. (2018). Reservoir zonation, rock ty** and compartmentalization of the Tortonian-Serravallian sequence, Temsah Gas Field, offshore Nile Delta. Egypt. Marine and Petroleum Geology, 92, 609–631.
Nabawy, B. S., & David, Ch. (2016). X-Ray CT scanning imaging for the Nubia sandstones: A macro scale tool for characterizing fluid transport. Geosciences Journal, 20(5), 691–704.
Nabawy, B. S., & ElHariri, T. Y. M. (2008). Electric fabric of cretaceous clastic rocks in Abu Gharadig basin, Western Desert, Egypt. Journal of African Earth Sciences, 52(1), 55–61.
Nabawy, B. S., & Géraud, Y. (2016). Impacts of pore- and petro-fabrics, mineral composition and diagenetic history on the bulk thermal conductivity of sandstones. Journal of African Earth Sciences, 115, 48–62.
Nabawy, B. S., Rochette, P., & Géraud, Y. (2009). Petrophysical and magnetic pore network anisotropy of some cretaceous sandstone from Tushka Basin. Egypt, Geophysical Journal International, 177(1), 43–61.
Nabawy, B. S., Rochette, P., & Géraud, Y. (2010). Electric pore fabric of the Nubia sandstones in south Egypt: characterization and modelling. Geophysical Journal International, 183, 681–694.
Nabawy, B. S., Sediek, K. N., & Nafee, S. A. (2015). Pore fabric assignment using electrical conductivity of some Albian-Cenomanian sequences in north Eastern Desert. Egypt. Arabian Journal of Geosciences, 8(8), 5601–5615.
Nabway, B. S., & Kassab, M. A. (2014). Porosity-reducing and porosity-enhancing diagenetic factors for some carbonate microfacies: A guide for petrophysical facies discrimination. Arabian Journal of Geosciences, 7(11), 4523–4539.
Noweir, A.M., Abdel-Hameed, A.M., & Salem, A. (2000). On the Petrology of Paleozoic-Mesozoic Nubian (Nuba) type sandstones in Egypt. In: Soliman, S.M. (Ed.), Sedimentary Geology of Egypt, Applications and Economics.
Patton, T., Moustafa, A., Nelson, R., & Abdine, A. (1994). Tectonic evolution and structural setting of the Suez rift. In: Landon SM (ed) Interior rift basin. AAPG Memoir 59, 9–55.
Perez, H. H., Datta-Gupta, A., & Mishra, S. (2005). The role of electrofacies, lithofacies, and hydraulic flow units in permeability predictions from well logs: a comparative analysis using classification trees. Society of Petroleum Engineers-84301-PA 13.
Pittman, E. D. (1992). Relationship of porosity and permeability to various parameters derived from mercury injection capillary pressure curves for sandstone. AAPG Bulletin, 76, 191–198.
Pittman, E. D. (2001). Estimating pore throat size in sandstones from routine core-analysis data: Search and Discovery Article 40009. http://www.searchanddiscovery.net/documents/pittman/index.htm.
Said, R. (1971). Explanatory note to accompany the geological map of Egypt. Geological Survey of Egypt, 56, 123.
Schowalter, T. T. (1979). Mechanics of secondary hydrocarbon migration and entrapment. AAPG Bulletin, 63(5), 723–760.
Serra, O. (1988). Fundamentals of well-log interpretation: the acquisition of logging data.
Serra, O., & Abbott, H. T. (1980). The contribution of logging data to sedimentology and stratigraphy, Society of Petroleum Engineers 9270-PA 19, Elsevier Science Publishing Co. Inc.
Shenawi, S. H., White, J. P., Elrafie, E. A., & Kilany, K. A. (2007). Permeability and water saturation distribution by lithologic facies and hydraulic units: A Reservoir Simulation Case Study: Society of Petroleum Engineers Paper no.105273. In 15th Society of Petroleum Engineers Middle East Oil & Gas Show and Conference, Kingdom of Bahrain.
Spearing, M., Allen, T., & McAulay, G. (2001). Review of the Winland R35 method for net pay definition and its application in low permeability sands. In International Symposium Proceedings, Society of Core Analysts Paper No. 63, 5.
Stinco, L. P. (2006). Core and log data integration; the key for determining electrofacies. In SPWLA 47th Annual Logging Symposium 7.
Stinco, L., Elphick, R., & Moore, W. (2001). Electrofacies and production prediction index determination in El Tordillo Field, San Jorge Basin, Argentina. In: 42nd society of professional well log analyst annual symposium, Houston.
Teh, W. J., Willhite, G. P., & Doveton, J. H. (2012). Improved reservoir characterization using petrophysical classifiers within electrofacies. Society of Petroleum Engineers 154341-PP 19.
Tiab, D., & Donaldson, E. C. (1996). Petrophysics. Theory and Practice of Measuring Reservoir Rock and Fluid Transport Properties. Houston: Gulf Publishing.
Winland, H. D. (1972). Oil accumulation in response to pore size changes, Weyburn field, Saskatchewan. Amaco Production Research Report No. F72-G-25.
Acknowledgments
The authors would like to thank the anonymous reviewers for their significant comments that helped us improve and reconstruct the manuscript. Special thanks are also due to the Editor Prof. Dr. John Carranza, whose patience and insightful suggestions have led to a concise revised version. The authors are grateful to the Egyptian General Petroleum Corporation and the Gulf of Suez Petroleum Company for releasing the data.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
El Sharawy, M.S., Nabawy, B.S. Integration of Electrofacies and Hydraulic Flow Units to Delineate Reservoir Quality in Uncored Reservoirs: A Case Study, Nubia Sandstone Reservoir, Gulf of Suez, Egypt. Nat Resour Res 28, 1587–1608 (2019). https://doi.org/10.1007/s11053-018-9447-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11053-018-9447-7