Diagenesis and sequence stratigraphy of the Fahliyan Formation in the Yadavaran oil field (Koshk and Hosseiniyeh) in the north Dezful Embayment

Document Type : مقالات پژوهشی

Authors

• Hassan Mohseni ¹
• Mossa Esfandyari ¹
• Mohammad Ali Kavousi ²

¹ Bu-Ali Sina University

² NIOC Exploration Directoriate

10.22067/sed.facies.v8i2.33283

Abstract

Introduction
Investigation on mutual relation between depositional facies and diagenesis in a sequence stratigraphic framework is essential for systematic recognition of a reservoir (Lucia, 2004; Ahr, 2008). Spatial distribution of porosities of carbonate rocks may drastically change due to diagenetic processes (Mehrabi and Rahimpour- bonab, 2013). Facies analysis and diagenetic studies in sequence stratigraphic framework could facilitate for reservoir simulation (Masse and Masse, 2011). Hence, combination between diagenesis and sequence stratigraphy is useful for better understanding of diagenetic processes (Morad et al., 2000). This research will discuss distribution and variations of diagenetic processes of the Fahliyan Formation in a sequence stratigraphic framework in the northern part of the Dezful Embayment.

Results and discussion
The Fahliyan Formation is composed of 24 microfacies that formed four facies associations and were deposited in tidal flat, lagoon, bar and open marine (Esfandyari, 2013). The tidal flat facies association includes quartzarenite, shale, intraclast grainstone, mudstone and dolomudstone. Absence of bioclasts, frequent detrital quartz grains and intraclast, evidently suggests a tidal flat setting (Flugel, 2010). Lagoonal facies association includes peloids wackestone/ packstone, algal boundstone and bioclastic mudstone. Abundant algal fragments (e. g. Salpingoporella, Dasycladacea, Actinoporella, Clypeina, Acicularia) are distributed in this facies association. Frequent lime mud, peloid and milliolid foraminifera suggest a lagoon environment located on mid- shelf (Flugel, 2010). Peloid- intraclast grainstone, ooid- intraclast grainstone and lithocodium boundstone are representatives of a bar/ barrier. Lack of lime mud and present of skeletal grains are evidence of dynamic high- energy setting. These are similar to bar microfacies of Flugel (2010) and facies belt 5 and 6 of Willson (1975). The open marine facies association is composed of resedimented/brecciated carbonate beds. Extraclast, bioclasts and quartz grains present in lime mud matrix. Mixed open marine and lagoonal biota may represent talus deposit formed in front of carbonate platform slope. Mudstone with sponge spicules and radiolarian are being interpreted as open shelf (Flugel, 2010) and facies belt 1 and 2 of Wilson (1975). Here, these facies association are interpreted as being deposited on a shelf type carbonate platform. Various diagenetic processes affected the Fahliyan Formation in the Yadavaran oil field such as micritization and neomorphism that are more abundant in the lagoonal facies. Bladed isopachus HMC cement was precipitated in grain- supported facies (e.g. grainstone of bar/ barrier). Moldic, vuggy and intraparticle porosities are developed within mud- supported and brecciated facies. Evidences of burial diagenesis were also observed as stylolite, along late stage dolomitization and poikilotopic cement as well.

Sequence stratigraphy
The Fahliyan Formation is composed of three 3rd order sequences that can be correlated with Lower Zuni I and Upper Zuni II megasequences (Klonga and Kesling, (2002) in a global scene. They can also be correlated to the Mehrdad supersequence of the Early Cretaceous of the Zagros basin (Heydari, 2008). These sequence are composed of TST and HST facies which are separated by MFS. The first MFS is equal to MFS K20 of the Arabian plate (Sharland, et al. 2001), which was reported from the lower Fahliyan Formation (Shakib, 1994). The second FMS was also recognized in the mid Fahliyan Formation, correlatable to MFS K30 of the Arabian plate (Sharland, et al. 2001). Dolomitized lime mudstones on top of the second sequence, suggest a type I sequence boundary. MFS of the last sequence was recognized within the upper Fahliyan Formation that can also be correlated to K40 of the Arabian plate (Sharland, et al. 2001; Shakib, 1994). A global fall of sea- level (Haq et al., 1988) caused influx of siliciclastic sediments into the basin during final stage of HST of the last sequence designating type I sequence boundary. These sequences are correlated to those previously reported from the Zagros basin and Arabian plate as well (e.g.: Shakib, 1994; Sharland, et al. 2001; 2013; Haq and Al-Qahtani, 2005). Moldic porosity in shallowing- upward, grain- supported sediments are abundant just below and above the sequence boundaries in both wells. They were probably developed after influx of meteoric water as a consequence of sea- level fall. Sea- level rise might have restricted influx of coarse siliciclastics. Dolomitization of mud- supported facies is evident as dispersed dolomite crystals. Although these fine crystalline dolomites may reduce the porosity of carbonate rocks, but they could effectively increase the permeability of such rocks (Lucia, 2004). HST sediments of the sequences 2 and 3 are grain- supported and are expected to be more porous and permeable. These sediments were deposited on shelf margin facies with considerable intergranular porosity which was occluded by cements.

Conclusion
The Fahliyan Formation is composed of shallow marine to deep shelf sediments. Shallow platform facies experienced various diagenetic processes which improved their porosity. The Fahliyan Formation consists of 22 carbonate microfacies and 2 siliciclastic lithofacies which were deposited in tidal flat, lagoon, bar and open marine environments on a carbonate shelf. These sediments comprise three 3rd depositional sequences. Diagenetic processes are effectively related to sequence stratigraphy. Early marine cements are closely confined to shelf- edge sediments of TST. Maximum dolomitization was also observed in TSTs, and tidal flat facies of HSTs. Evidence of meteoric diagenesis after decline in sea- level rise are evident in sediments of late HSTs in both wells, particularly in two upper sequences.

Keywords: Dezful Embayment; Fahliyan Formation; Yadavaran oil field; diagenesis; sequence stratigraphy.

Reference
Ahr, W.M., 2008. Geology of carbonate reservoir, John Wiley and Sons, Inc., 277 p.
Catuneanu, O., Galloway, W.E., Kendall, Ch.G.St.C., Miall, A.D., Posamentier, H.W., Strasser, A., & Tucker, M. E., 2011. Sequence stratigraphy: methodology and Nomenclature. Newsletters on stratigraphy, 4413: 173-245.
Esfandyari, M. 2013 Depositional environment, sequence stratigraphy and diagenesis of the Fahlyian Formation in the Yadavaran oil field, un-pub. MSc. Thesis, Faculty of Science, Bu-Ali SinaUniversitiy, 131 p.
Flugel, E., 2010. Microfacies of carbonate rocks, analysis interpretation and application. Springer-Verlage, Berlin, 984 p.
Golonka, J., & Kiessling, W., 2002. Phanerozoic time scale and definition of time slices Phanerozoic reef patterns. Society of Economic Paleontologists and Mineralogists special publication, 72: 11-20.
Haq, B., Hardenhol, J., & Vail, P.R., 1988. Mesozoic and Cenozoic chronostratigraphy and cycles of sea-level change, In: Wilgus, C.K., Hasting, B.S., Kendall, Ch.C.St.C., Posamentier, H.W., Ross, C.A., & Van wagoner, J.C., (eds.), Sea-Level changes: An integrated approach. Society of Economic Paleontologists and Mineralogists special publication, 42: 71-108.
Haq, B.U., & Al-Qahtani, A., 2005. Jurassic-Neogene Arabian Platform cycle chart: GeoArabia, 10 (2): 127-160.
Heydari, E., 2008. Tectonics versus eustatic control on supersequence of the Zagros Mountains of Iran. Tectonophysics, 451: 56-70.
Lucia, F.J., 2004, Origin and petrophysics of dolostone pore space. Geological Society London Special Publications, 235: 141-155.
Mehrabi, H., Rahimpour-Bonab, H., 2014. Paleoclimate and tectonic controls on the depositional and diagenetic history of the Cenomanian-early Turonian carbonate reservoirs, Dezful Embayment, SW Iran. Facies, 60 (1): 147–167.
Morad, S., Ketzer, M., & De Ros, F., 2000. Spatial and temporal distribution of diagenetic alterations in siliciclastic rocks: implications for mass transfer in sedimentary basins. Sedimentology, 47: 95-120.
Shakib, S.S., 1994. Palaeoenvironment and Biostratigraphic Significance of Foraminiferal Associations from the Early Cretaceous sediments of SW Iran. In: Simmons, M.D., (ed.), Micropalaeonotology and Hydrocarbon Exploration in the Middle East. Chapman and Hall, pp. 127-158.
Sharland, P.R., Casey, D.M., Davies, R.B., Hall, S.H., Heward, A.P., Horbury. A.D., & Simmons, M., 2001. Arabian Plate Sequence stratigraphy. GeoArabia special publication, 2: 1-490.
Wilson, J.L., 1975. Carbonates facies in geologic history. Springer-Verlag, Berlin, 471 p.

Keywords

• Dezful Embayment
• Fahliyan Formation
• Yadavaran oilfield
• diagenesis
• Sequence stratigraphy

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References

اسفندیاری، م.، 1392. بررسی محیط رسوبی، چینه‌نگاری سکانسی و دیاژنز سازند فهلیان در میدان نفتی یادآوران. پایان‌نامه کارشناسی ارشد، دانشگاه بوعلی سینا همدان، 131 ص.

مطیعی، ه.، 1372. زمین شناسی ایران: چینه شناسی زاگرس. سازمان زمین شناسی و اکتشافات معدنی کشور، 536 ص.

لاسمی، ی.، فیضی، م.، 1385. رخساره‌های پلاتفرمی تا دور از پلاتفرمی در سازند فهلیان: گواهانی بر پدید آمدن حوضه بین شلفی در جنوب باختر ایران. بیست و پنجمین همایش علوم زمین، سازمان زمین‌شناسی و اکتشافات معدنی کشور، صص242-249.

فیض‌نیا، س.، فهیمی، ع.، یاوری، م.، 1389. بررسی محیط رسوبی و چینه‌نگاری سکانسی سازند فهلیان در میدانهای نفتی اهواز و آب-تیمور. پژوهشهای دانش زمین، 1: 55-74.

Adabi, M.H., Salehi, M.A., & Ghabeishavi, A., 2010. Depositional environment, sequence stratigraphy and geochemistry of Lower Cretaceous carbonates (Fahliyan Formation), south-west Iran. Journal of Asian Earth Sciences, 39: 148-160.

Ahr, W.M., 2008. Geology of carbonate reservoir, John Wiley and Sons, Inc., 277 p.

Al-Husseini, M.T., 2000. Origin of the Arabian Plate Structure: Amar Collision and Najd Rift. GeoArabia, 5 (4): 527-542.

Al-Rawi, M., 1981. Geological interpretation of oil entrapment in the Zubair Formation, Raudhatain Field. Society of Petroleum Engineers Middle East Oil Technical Conference, pp. 149-158.

Basyoni, M.H., & Khalil, M., 2013. An overview of the diagenesis of the Upper Jurassic carbonates of Jubaila and Hanifa formations, Central Saudi Arabia. Arabian Journal of Geosciences, 6: 557-572.

Bathurst, R.G.C., 1986. Carbonate diagenesis and reservoir development: Conservation, destruction and creation of pores. In: Bathurst, R.G.C., & Land, L.S., (eds.), Carbonate deposition environments. Part 5, Diagenesis 1. Colorado School of Mines Quarterly, 81: 1-25.

Berberian, M., 1995. Master blind thrust faults hidden under the Zagros fold: active basement tectonics and surface morphotectonics. Tectonophysics, 241: 193-224.

Catuneanu, O., Galloway, W.E., Kendall, Ch.G.St.C., Miall, A.D., Posamentier, H.W., Strasser, A., & Tucker, M. E., 2011. Sequence stratigraphy: methodology and Nomenclature. Newsletters on stratigraphy, 4413: 173-245.

Dunham, R.J., 1962. Classification of carbonate rocks according to depositional texture. In: Ham, W.E., (ed.), Classification of Carbonate Rocks. American Association of Petroleum Geologists Memoir, 1: 108-121.

Ehrenberg, S.N., Aqrawi, A.A.M., Nadeau, & P.H., 2008. An overview of reservoir quality in producing Cretaceous strata of the Middle East. Petroluem Geoscience, 14 (4): 307-318.

El-Ghali, M.A.K., El-Khoriby, E., Mansurbeg, H., Morad, S., & Ogle, N., 2013. Distribution of carbonate cements within depositional facies and sequence stratigraphic framework of shoreface and deltaic arenites, Lower Miocene, the Gulf of Suez rift, Egypt. Marine and Petroleum Geology, 45: 267-280.

Flugel, E., 2010. Microfacies of carbonate rocks, analysis interpretation and application. Springer-Verlage, Berlin, 984 p.

Folk, R.L., 1974. Petrology of Sedimentary Rocks. Hemphill Publication Co., Austin, Texas, 81 p.

Golestaneh, A., 1965. Micropaleontology study of Khami Group and the Jurassic-Cretaceous in Fars Province (southern Iran). Bulletin de Bureau de Recherches Geologiques et Minières, 3: 165-179.

Golonka, J., & Kiessling, W., 2002. Phanerozoic time scale and definition of time slices Phanerozoic reef patterns. Society of Economic Paleontologists and Mineralogists special publication, 72: 11-20.

Haq, B., Hardenhol, J., & Vail, P.R., 1988. Mesozoic and Cenozoic chronostratigraphy and cycles of sea-level change, In: Wilgus, C.K., Hasting, B.S., Kendall, Ch.C.St.C., Posamentier, H.W., Ross, C.A., & Van wagoner, J.C., (eds.), Sea-Level changes: An integrated approach. Society of Economic Paleontologists and Mineralogists special publication, 42: 71-108.

Haq, B.U., & Al-Qahtani, A., 2005. Jurassic-Neogene Arabian Platform cycle chart: GeoArabia, 10 (2): 127-160

Heydari, E., 2008. Tectonics versus eustatic control on supersequence of the Zagros Mountains of Iran. Tectonophysics, 451: 56-70.

Jamalian, M., Adabi, M.H., Moussavi, M.R., Sadeghi, A., Dariush Baghbani, D., & Ariyafar, B., 2011. Facies characteristic and paleoenvironmental reconstruction of the Fahliyan Formation, Lower Cretaceous, in the Kuh-e-Siah area, Zagros Basin, southern Iran. Facies, 57: 101-122.

James, G.A. & Wynd, J.G., 1965. Stratigraphic nomenclature of Iranian Oil Consortium Agreement Area, American Association of Petroleum Geologists Bulletin, 49 (12): 2182-2245.

Kamali, M.R., Abolghasemi, A., Bagheri, R., & Kadkhodayi, A., 2013. Petroleum geochemistry and oil-oil correlation of the Fahliyan and Surmeh reservoirs in the Garangan and Chilingar oilfields, the Dezful embayment (Sw Iran). Journal of Petroleum Exploration and Production Technology, 3: 85-92.

Kheradpir, A., 1975. Stratigraphy of Khami Group in southwest Iran. National Iranian Oil Company, No. 1235 (unpublished).

Lucia, F.J., 1995. Carbonate Reservoir Characterization. Springer-Verlag, Berlin, 336p.

Lucia, F.J., 1995. Rock-fabric / petrophysical classification of carbonate pore space for reservoir characterization. American Association of Petroleum Geologists Bulletin, 79 (9): 1275–1300.

Masse, J.P., & Masse, M.F., 2011. Drowning discontinuities and stratigraphic correlation in platform carbonates: the late Barremian-early Aptian record of southeast France. Cretaceous Research, 32: 659-684.

Mehrabi, H., Rahimpour-Bonab, H., 2014. Paleoclimate and tectonic controls on the depositional and diagenetic history of the Cenomanian-early Turonian carbonate reservoirs, Dezful Embayment, SW Iran. Facies, 60 (1): 147–167.

Morad, S., Ketzer, M., & De Ros, F., 2000. Spatial and temporal distribution of diagenetic alterations in siliciclastic rocks: implications for mass transfer in sedimentary basins. Sedimentology, 47: 95-120.

Navidtalab, A., Rahimpour-Bonab, H., Nazari-Badii, A., Sarfi, M., 2013. Challenges in deep basin sequence stratigraphy: a case study from the Early–Middle Cretaceous of SW Zagros. Facies, 60 (1): 195–215.

Posamentier, H., & Allen, G., 1993. Variability of the sequence stratigraphic model: effects of local basin factors. Sedimentary Geology, 86: 91-109.

Raiswell, R., 1982. Pyrite texture, isotopic composition and the availability of iron. American Journal of Science, 82: 1244-1263.

Shakib, S.S., 1994. Palaeoenvironment and Biostratigraphic Significance of Foraminiferal Associations from the Early Cretaceous sediments of SW Iran. In: Simmons, M.D., (ed.), Micropalaeonotology and Hydrocarbon Exploration in the Middle East. Chapman and Hall, pp. 127-158.

Sharland, P.R., Casey, D.M., Davies, R.B., Hall, S.H., Heward, A.P., Horbury. A.D., & Simmons, M., 2001. Arabian Plate Sequence stratigraphy. Geo Arabia special publication, 2: 1-490.

Taylor, K., Gawthorpe, R., & Van Wagoner, J., 1995. Stratigraphic control on laterally persistent cementation, Book Cliff, Utah. Journal of Sedimentary Research, 69: 225-228.

Tucker, M.E., & Wright, V.P., 1990. Carbonate Sedimentology. Blackwell Science, Inc. 482 p.

Tucker, M.E., 1991. Sedimentary Petrology, Blackwell Scientific Publication, 260 p.

Van Buchem, F.S.P., Allan, T.L., Laursen, G.V., Lotfpour, M., Moallemi, A., Monibi, S., Motiei, H., Pickard, N.H.A., & Tahmasbi, A.R., Vedrenne, V., & Vincent, B., 2010. Regional stratigraphic architecture and reservoir types of the Oligo-Miocene deposits in the Dezful Embayment (Asmari and Pabdeh Formations) SW Iran. Geological Society of London, Special Publications, 329: 219-263.

Wilson, J.L., 1975. Carbonates facies in geologic history. Springer-Verlag, Berlin, 471 p.

Zuffa, G., Cibin, U., & Di Giulio, A., 1995. Arenite petrography in sequence stratigraphy. Journal of Geology, 103: 451- 459.