Determining hydraulic flow units by using the flow zone indicator method and comparing them with electrofacies and microscopic sections in Sarvak Formation in one of the fields of Abadan plain


1 Faculty of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran

2 Dana Energy Company, Iran


Reservoir characterization and the identification of the main factors controlling the quality of the reservoir has an important contribution to providing a real image of reservoir properties. The Sarvak Formation is one of the most important reservoir rocks in the Zagros sedimentary basin and the studied well is divided into three core facies based on layering, texture, fossils, and sedimentary structure. In this study, first, using the porosity and permeability data of a well in this formation, hydraulic flow units were determined based on the flow zone indicator and then compared with the results of thin sections studies, effective factors on the quality of each flow unit were identified. The results of determining the hydraulic flow units based on the flow zone indicator indicate the existence of four flow units A, B, C, and D in Sarvak Formation, which increase the reservoir quality from units A to D, respectively. Then, the electrofacies of Sarvak Formation were determined using well log data which resulted in five electrofacies. By comparing electrofacies with flow units and the results of microscopic section studies, it was observed that Sarvak Formation has a high heterogeneity in the studied well due to various diagenetic processes such as dissolution, cementation, and dolomitization that using the concept of flow units and electrofacies and comparing with the results of microscopic section studies, it is possible to separate different parts of this reservoir that have the same flow characteristics and generalize the results to non-core wells in the study field.


Abbaszadeh, M., Fujii, H., Fujimoto, F., 1996. Permeability prediction by hydraulic flow unit’s theory and applications, Society of Petroleum Engineers Formation Evaluation, pp. 263-271.
Acosta, L.M., Marin, E., Labastidas, E., Cordoba, P.M., Pascual, J., Bello, J.A., Auxiette, G., Gou, Y., Thorsen, B. and Jimenez, J.G., 2005. Reservoir Study V9 of El Furrial Field, Venezuela: paper Society of Petroleum Engineers 95047 presented at the Society of Petroleum Engineers Latin American and Caribbean Petroleum Engineering Conference, Rio de Janeiro, Brazil, June 20-23.
Ahr, W.M., 1991. Pore characteristics as surrogates for permeability in mapping reservoir flow units: Vacuum San Andreas field, Lea County, New Mexico (abs.), American Association of Petroleum Geologists Bulletin, pp. 532–533.
Ali-Nandalal, J., Gunter, G., 2003. Characterizing Reservoir Performance for the Mahogany 20 Gas Sand Based on Petrophysical and Rock Typing Methods: paper Society of Petroleum Engineers 81048 presented at the Society of Petroleum Engineers Latin American and Caribbean Petroleum Engineering Conference, Port-of-Spain, Trinidad, West Indies, 27-30.
Amaefule, J.O., Altunbay, M., Tiab, D., Kersey, D.G., Keelan, D.K., 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 Annual Conference (SPE 26436-MS), pp. 205-220.
Archie, G.E., 1950. Introduction to Petrophysics of Reservoir Rocks, American Association of Petroleum Geologists Bulletin, pp. 943-961.
Bashari, A., 2007. Integrated 3D seismic and petrophysical data ofthe Sarvak formation in the Persian Gulf First Break, pp. 2545–2553.
Bhattacharya, S., Byrnes, A.P., Watney, W.L., Doveton, J.H., 2008. Flow unit modeling and fine-scale predicted permeability validation in Atokan sandstones: Norcan East field, Kansas, American Association of Petroleum Geologists Bulletin, pp. 709–732.
Bucheb, J.A., Evans, H.B., 1994. Some applications of method used in electrofacies identification. The Log Analyst 35, 14-26.
Davies, D.K., Williams, B.P.J., Vessell, R.K., 1993. Reservoir Geometry and Internal Permeability Distribution in Fluvial, Tight Gas Sandstones, Travis Peak Formation, Texas: paper Society of Petroleum Engineers 21850 presented at the Rocky Mountain Regional Meeting and Low Permeability Reservoirs Symposium, Denver, CO, April 15-17.
Dorfman, M.H., Newey, J.J., Coates, G.R., 1990. New techniques in lithofacies determination and permeability prediction in carbonate using well logs, Geological applications of wireline logs, Geological Society Special Publication, pp. 113-120.
Doveton, J.H., Prensky, S.E., 1992. Geological applications of wireline logs-A synopsis of developments and trends. The Log Analyst 33, 286-303.
Ebanks, W.J., 1987. Flow unit concept: Integrated approach to reservoir description for engineering projects (abs.), American Association of Petroleum Geologists Bulletin, pp. 551–552.
El Sawy, M.Z., Abuhagaza, A.A., Nabawy, B.S., Lashin, A., 2020. Rock typing and hydraulic flow units as a successful tool for reservoir characterization of Bentiu-Abu Gabra sequence, Muglad basin, southwest Sudan. Journal of African Earth Sciences 171, 103961.
Flugel, E., 2010. Microfacies of carbonate rocks: analysis, interpretation and application, 2nd, Springer, Berlin, 984.
Gomes, J.S., Ribeiro, M.T., Strohemenger, C.J., Negahban, S., Kalam, M.Z., 2008. Carbonate reservoir rock typing, the link between geology and SCAL, Proceedings of the Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE.
Hearn, C.L., Ebanks Jr, W.J., Tye, R. S., Ranganathan, V., 1984. Geological factors influencing reservoir performance of the Hartzog Draw Field, Wyoming. Journal of Petroleum Technology 36, 1–335.
James, G.A., Wynd, J.G., 1965. Stratigraphic Nomenclature of Iranian Oil Consortium Agreement Area, American Association of Petroleum Geologists Bulletin, pp. 2182-2245.
Kadkhodaie-Ilkhchi, A., Amini, A., 2009. A fuzzy logic approach to estimating hydraulic flow units from well log data: A case study from the Ahwaz Oilfield, south Iran. Journal of Petroleum Geology 32, 67-78.
Khalid, M., Desouky, S.E.D., Rashed, M., Shazly, T., Sediek, K., 2020. Application of hydraulic flow units’ approach for improving reservoir characterization and predicting permeability. Journal of Petroleum Exploration and Production Technology 10, 467-479.
Larue, D.K., Legarre, H., 2004. Flow units, connectivity, and reservoir characterization in a wave-dominated deltaic reservoir: Meren reservoir, Nigeria American Association of Petroleum Geologists Bulletin, pp. 303-324.
Lee, S.H., Datta-Gupta, A., 1999. Electrofacies characterization and permeability predictions in carbonate reservoirs: Role of multivariate analysis and nonparametric regression, Society of Petroleum Engineers Annual Technical Conference and Exhibition OMEGA, Houston, Texas, pp. 409-421.
Lee, S.H., Kharghoria, A., Datta-Gupta, A., 2002. Electrofacies Characterization and Permeability Predictions in Complex Reservoirs, Society of Petroleum Engineers Reservoir Evaluation & Engineering, pp. 237-248.
Mathisen, T., Lee, S.H., Datta-Gupta, A., 2001. Improved Permeability Estimates in Carbonate Reservoirs Using Electrofacies Characterization: A Case Study of the North Robertson Unit, West Texas: paper Society of Petroleum Engineers, presented at the Society of Petroleum Engineers Permian Basin Oil and Gas Recovery Conference, Midland, TX, May 15-16.
Moline, R.G., Bahr, J.M.., 1995. Estimating spatial distributions of heterogeneous subsurface characteristics by regionalized classification of electrofacies. Mathematical Geology 27, 3-22.
Motiei, H., 1994. Stratigraphy of Zagros. A Publication of the Geological Survey of Iran, p. 536 (in Farsi).
Perez, H.H., Datta-Gupta, A., Mishra, S., 2005. The role of electrofacies, lithofacies and hydraulic flow units in permeability prediction from well logs: A comparative analysis using classification trees, Society of Petroleum Engineers Reservoir Evaluation & Engineering, pp. 143-155.
Petrokushyn, O., Antoniuk, V., 2020. Reservoirs Type Classification Using Hydraulic Flow Units Approach With An Application To Pivnichno-Korobochkynska Area (Dnipro-Donetsk Depression), In Geoinformatics, Theoretical and Applied Aspects, European Association of Geoscientists & Engineers, p. 1-5.
Porras, J.C., Barbato, R., Khazen, L., 1999. Reservoir Flow Units: A comparison between three different models in the Santa Barbara and Pirital fields, north Monagas area, eastern Venezuela Basin: paper Society of Petroleum Engineers 53671 presented at the Society of Petroleum Engineers Latin American and Caribbean Petroleum Engineering Conference, Caracas, Venezuela, April 21-23.
Porras, J.C., Campos, O., 2001. Rock typing: A key approach for petrophysical characterization and definition of flow units, Santa Barbara field, eastern Venezuela Basin, Society of Petroleum Engineers, 69458- MS.
Rushing, J.A., 2008. Rock Typing - Keys to Understanding Productivity in Tight Gas Sands: Unconventional Reservoirs Conference, Keystone, Colorado, U.S.A.
Serra, O., 1986. Fundamentals of well log interpretation, the interpretation of logging data: Developments in Petroleum Science 15B, Elsevier, Amsterdam, 684.
Serra, O., Abbot, H.T., 1982. The contribution of logging data to sedimentology and stratigraphy, Society Petroleum Engineers Journal 22, 117-135.
Shenawi, S.H., White, J.P., Elrafie, E.A., El-Kilany, K.A., 2007. Permeability and water saturation distribution by lithologic facies and hydraulic units: A reservoir simulation study: paper Society of Petroleum Engineers 105273 presented at the 15th Society of Petroleum Engineers Middle East Oil & Gas Show and Conference, Kingdom of Bahrain, March 11-14.
Soleimani, B., Moradi, B., Ghobeishavi, A., 2016. Evaluation of Bangestan Reservoir Quality Using Electrofacies and Flow Units in Mansouri Field in Southwest, Iran. Advanced Applied Geology 6, 22-24.
Teymori, E., Abdideh, M., Gholamzadeh, M.A., 2020. The zoning and characterisation of heterogeneous carbonate reservoirs based on the concept of flow units. Applied Earth Science 129, 1-11.
Zeinalzadeh, A., Moussavi-Harami, R., Mahboubi, A., Sajjadian, V. A., 2015. Basin and petroleum system modeling of the Cretaceous and Jurassic source rocks of the gas and oil reservoirs in Darquain field, south west Iran. Journal of Natural Gas Science and Engineering 26, 419-426.