Study of flow units and electrofacies in the Mishrif Formation (upper part of Sarvak Formation) and estimation of reservoir zone in Sirri Oilfields located in Persian Gulf

Document Type : Research Paper



The upper part of the Sarvak Formation is one of important hydrocarbon reservoirs in the Middle East and Persian Gulf. This part of the Sarvak Formation is equivalent to the Mishrif Formation (with mid-Cenomanian age) in Persian Gulf and neighboring countries. In this study, investigation of a set of well log data and their clustering based‌ on mathematic and statistical rules resulted in determination of reservoir electrofacies (EF1, EF2, EF3 and EF4) for the Mishrif Formation in three wells of Sirri fields in the Persian Gulf. Then, by using of core porosity and permeability data and flow zone indicator (FZI) method, flow units (A, B, C and D) were identified. With integration of the results from these two methods, reservoir zone thickness of Sirri Esfand, Dena and Civand 62 ± 0.5m, 91± 0.5m and 39 ± 0.5m was determined, respectively. Finally, by utilization of water saturation factor, hydrocarbon column thickness in Sirri Esfand, 34.5m; in Sirri Dena, 8.5m and in Sirri Civand, 39.5m was calculated. Based on these results, hydrocarbon column thickness from Sirri Esfand to Dena decreases, and it increases from Sirri Dena towards Sirri Civand.


جدیری­آقایی، ر (1393) مطالعه رخساره­های رسوبی و تعیین واحدهای جریانی در بخش بالایی سازند سروک (بخش میشریف) در میدان­های نفتی سیری C، D و E در خلیج فارس، پایان­نامه­ی کارشناسی­ارشد، دانشگاه تهران.
Abbaszadeh, M., Fujii, H., Fujimoto, F (1996) Permeability prediction by hydraulic flow unit’s theory and applications, SPE Formation Evaluation, v. 11, p. 263-271.
Al-Farisi, O., et al (2004) Electrical resistivity and gamma ray logs: two physics for two permeability estimation approaches in Abu Dhabi Carbonates, SPE 88687 Presented at the 11th SPE Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, U.A.E.
Alsharhan, A. S., Nairn, A. E. M (1988) Review of the Cretaceous Formations in the Arabian Peninsula and Persian Gulf, Part II, Mid-Cretaceous (Waisa Group) Stratigraphy and Paleogeography, Journal of Petroleum Geology, v.11(1), p. 89-112.
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), p. 205-220.
Archie, G.­E (1942) The electrical resistivity log as an aid in determining some reservoir characteristics, Transactions AIME, v. 146, p. 54-62.
Assadi, A., Honarmand, J., Moallemi, S. A., Abdollahie-Fard, I (2016) Depositional environments and sequence stratigraphy of the Sarvak Formation in an oil field in the Abadan Plain SW Iran,Facies, v.62(4), 26.6.
Bashari, A., Minaei, M (2003) Regional study of Sarvak and Ilam formations in the Sirri district of the Persian Gulf, AAPG International Conference and Exhibition Technical Program.‏Barcelona, Spain.
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.
Burchette, T.P., Briton, S.R (1985) Carbonate facies analysis in exploration for hydrocarbon: A case-study from the Cretaceous of Middle East, In P.J. Barnchley and Grélaud, Carine, et al Development of incisions on a periodically emergent carbonate platform (Natih Formation, Late Cretaceous, Oman), Journal of Sedimentary Research, v.76(4), p. 647-669.‏
Filbrandt, J.B., Al-Dhahab, S., Al-Habsy, A., Harris, K., Keating, J., Al-Mahruqi, S., Ozkaya, S.I., Richard, P.D., Robertson, T (2006) Kinematic interpretation and structural evolution of North Oman, Block 6, since the Late Cretaceous and implications for timing of hydrocarbon migration into Cretaceous reservoirs,GeoArabia, v.11(1), p. 97-140.
Flugel, E (2004, 2010) Microfacies of carbonate rocks: analysis, interpretation and application, 2nd edn, Springer, Berlin, p 984.
Gradstein, F.M., et al (2004) A new geological time scale, with special reference to Precambrian and Neogene, Episodes, v.27(2), p. 83-100.
Hajikazemi, E., Al-Aasm, I. S., Coniglio, M (2010) Subaerial exposure and meteoric diagenesis of the Cenomanian-Turonian Upper Sarvak Formation, southwestern Iran, Geological Society, London, Special Publications, v. 330(1), p. 253-272.
Kadkhodaie-Ilkhchi, R., Rezaee, R., Mousavi-Harami, R., Kadkhodaie-Ilkhchi, A (2013) Analysis of reservoir electrofacies in the framework of hydraulic flow units in the Whicher Range Field, Perth Basin, Western Australia, Journal of Petroleum Science and Engineering, v.111, p. 106-120.
Kumar, B., Kishore, M (2006) Electrofacies Classification: A Critical Approach, 6th International Conference and Exposition on Petroleum Geophysics, Kolkata, p. 822-825.
Lee, S.H., Kharghoria, A., Datta-Gupta, A (2002) Electrofacies characterization and permeability predictions in complex reservoirs, SPE.Reserve. Eval. Eng, v.5, p. 237–248.
Loosveld, R.J.H., Bell, A., Terken, J.J.M (1996) The tectonic evolution of interior Oman,GeoArabia, v.1, p. 28-50.
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, SPE 70034 Presented at the 2001 SPE Permian Basin Oil and Gas Recovery Conference, Midland, TX.
Pattison, R., Takin, M (1971) Geological significance of the Dezful embayment boundaries, National Iranian Oil Company, Report 1166 (unpublished).
Perez, H.H., Datta-Gupta, A., Mishra, S (2003) The role of electrofacies, lithofacies, and hydraulic flow units in permeability predictions from Well Logs: a comparative analysis using classification trees, SPE84301 Presented at the SPE Annual Conference and Exhibition. SPE Reservoir Evaluation and Engineering, Denver, CO, p.143-155.
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, SPE, 69458-MS.
Rahimpour‐Bonab, H., Mehrabi, H., Navidtalab, A., Izadi‐Mazidi, E (2012) Flow unit distribution and reservoir modelling in cretaceous carbonates of the Sarvak Formation, Abteymour Oilfield, Dezful Embayment, SW Iran, Journal of Petroleum Geology, v. 35(3), p. 213-236.
Razin, P., Taati, F., Van Buchem, F.S.P (2010) Sequence stratigraphy of Cenomanian-Turonian carbonate platform margins (Sarvak Formation) in the high Zagros, SW Iranian outcrop reference model for the Arabian plate, American Association of Petroleum Geologists, Bulletin,v.69, p.1-21.
Searle, M.P., Warren, C.J., Waters, D.J., Parrish, R.R (2004) Structural evolution, metamorphism and restoration of the Arabian continental margin, SaihHatat region, Oman Mountains, Journal of Structural Geology, v.26(3), p. 451-473.‏
Serra, O (1986) Fundamentals of Well-Log Interpretation. The Interpretation of Logging Data, Developments in Petroleum Science, 15 B, 684 pp., Elsevier (Amsterdam).
Serra, O., Abbot, H.T (1980) The contribution of logging data to sedimentology and stratigraphy, 55th Annual Fall Meeting of AIME (SPE 9270), Dallas, Texas.
Sharland, P.R., Archer, R., Casey, D.M. et al (2001) Arabian plate sequence stratigraphy,GeoArabia Special Publication, 2, Gulf PetroLink, Bahrain, p. 261-278.
Ye, S.J., Rabiller, P (2005) Automated Electrofacies Ordering Society of Petrophysicist and well Log Analysts,v. 46 (6), p. 409-423.