2PhD Candidate of Hormozgan University-Senior Reservoir Geologist
Mauddud member with the age of late Albian to Cenomanian is equivalent to the lower Sarvak formation in the southern Persian Gulf and adjacent area. In this work, microfacies, depositional environment, and diagenetic processes affected the Mauddud member in a field in the Persian Gulf are investigated. Based on the studies of available cores and thin sections of 3 wells, five types of microfacies, namely MF1 to MF5, have been identified in the Mauddud member. These microfacies have been deposited in 2 facies belt including a vast lagoon and local bioclastic shoal. Based on the lack of great barrier reefs and calciturbidities and gradual change of microfacies into each other, it is concluded that the Mauddud member was deposited on a shallow marine homoclinal ramp. Several diagenetic processes such as bioturbation, micritization, dissolution, cementation, dolomitizetion, and compaction have influenced this member. Among all, dissolution increased porosity and thereby reservoir quality, while cementation and compaction decreased reservoir characteristics. Finally, it was found out that matrix porosity was the main type of porosity in the studied interval.
Ghazban F., Petroleum Geology of the Persian Gulf, University of Tehran, 2007, 707.
Sadooni F. N. and Alsharhan A. S., “Strati-graphy, Microfacies, and Petroleum Potential of the Mauddud Formation (Albian-Cenomanian) in the Arabian Gulf Basin,” American Association of Petroleum Geologists Bulletin, 2003,87(10), 1653-1680.
Taati Qorayem F., Van Buchem F., and Razin P., “High Resolution Sequence Stratigraphy of the Bangestan Group in a Tectonically Active Setting (Dezful- Izeh) Zagros-Iran,” AAPG International Conference, Barcelona, Spain, 2003.
Taghavi A. A., Mørk A., and Emadi M. A., “Sequence Stratigraphically Controlled Diagenesis Governs Reservoir Quality in the Carbonate Dehluran Field, Southwest Iran,” Petroleum Geoscience,2006, 12(2), 115-126.
Taghavi A. A., Mørk A., and Kazemzadeh E., “Flow Unit Classification for Geological Modeling of a Heterogeneous Carbonate Reservoir: Cretaceous Sarvak Formation, Dehluran Field, SW Iran,” Journal of Petroleum Geology, 2007, 30(2), 129-146.
Parvaneh Nejad Shirazi M., “Albian-cenomanian Zonation (Foraminifers and Calcareous Aglae) in the Northern Fars, Iran,” American Journal of Applied Sciences,2009, 6 (4), 709-714.
 Hajikazemi E. and Al-Aasm I. S., “Chemostratigraphy of Cenomanian-turonian Carbonates of the Sarvak Formation, Southern Iran,” Journal of Petroleum Geology, 2012, 35, 187-205.
James G. A. and Wynd J. G., “Stratigraphical Nomenclature of Iranian Oil Consortium Agreement Area,” Ameri-can Association of Petroleum Geologists Bulletin, 1965, 49, 2182-2245.
Setudenia A., “The Mesozoic Sequence in South-west Iran and Adjacent Areas,” Journal of Petroleum Geology, 1978, 1, 3-43.
Dickson J. A. D., “A Modified Staining Technique for Carbonate in Thin Section,” Nature, 1965, 205, 587-594.
Dunham R. J., “Classification of Carbonate Rocks According to Depositional Texture,” In: W. E. Ham (Ed.), Classification of Carbonate Rocks, AAPG Memoir, 1962, 1, 108-121.
Carozzi A. V., Carbonate Rocks Depo-sitional Model: a Microfacies Approach Prentice, Hall: New Jersey, 1989, 604.
Wilson J. L., Carbonate Facies in Geologic History, Springer-Verlag: New York, 1975, 439.
Flügel E., Microfacies of Carbonate Rocks, Springer-Verlag, New York, 2010, 967.
Gregg J. M. and Sibley D. F., “Epigenetic Dolomitization and the Origin of Xeno-topic Dolomite Texture Reply,” J. Sed. Petrology, 1984, 56, 735-763.
Sibley D. F. and Gregg J. M., “Classification of Dolomite Rock Texture,” Journal of Sedimentary Petrology, 1987, 57, 967-975.
Mazzullo S. J., “Geochemical and Neo-morphic Alteration of Dolomite: A Review,” Carbonate and Evaporates, 1992, 7, 21-37.
Tucker M. E. and Wright V. P., Carbonate Sedimentology, Blackwell: Sci. Pub., 1990, 482.
Strohmenger C. J., Demko T. M., Mitchell J. C., Lehmann P. J., et al., “Regional Sequence Stratigraphic Framework for the Burgan and Mauddud Formation (Lower Cretaceous, Kuwait),” Implications for Reservoir Distribution and Quality (Abs.): GeoArabia., 2002, 7, 304.
Ahr W., Geology of Carbonate Reservoirs, Wiley Publ, 2008,277.
Demko T. M., Patterson P. E., Feldman H. R., Strohmenger J. C., and et al., “Sequence Stratigraphy and Reservoir Architecture of the Burgan and Mauddud Formation (Lower Cretaceous), Kuwait (Abs),” AAPG Annual Meeting Program, 2003, 5, A39.
Bathurst R. G. C., Carbonate Sediment and their Diagenesis, Elsevier: North Holland, 1975, 658.
Jordan C. F., Connaly C., and Vest H. A., “Middle Cretaceous Carbonate of Mishrif Formation, Fateh Field, Offshore Dubai, U.A.E.” In: Roehl, P.O. & Choquette, P.W. (Eds) Carbonate Petroleum Reservoirs, Springer-Verlag, New York, 1985, 426-442.
Scoffin T. P., An Introduction to Carbonate Sediments and Rocks, Blackie: Glasgow, 1987.
Choquette P. W. and Pray L. C., “Geologic Nomenclature and Classification of Poro-sity in Sedimentary Carbonates,” AAPG. Bulletin, 1970, 54, 207-250.
Folk R. L., Petrology of Sedimentary Rocks, Hemphill: Austin, Texas, 1974, 182.
Alsharhan A. S. and Saad J. L., “Stylolites in Lower Cretaceous Carbonate Reservoirs UAE.” in A. S. Alsharhan and R. W. Scott, eds., Middle East Models of Jurassic/ Cretaceous Carbonate Systems: SEPM Special Publication, 2000, 69, 179-200.
Logan B. W. and Semeniuk V., Dynamic Metamorphism; Processes and Products in Devonian Carbonate Rocks, Canning Basin: Western Australia, Geological Soci-ety Australia Special Publication 16, 1976, 138.