Stratigraphy and lithology
| Article # 27_2025 | submitted on 05/12/2025 displayed on website on 07/29/2025 |
| 14 p. | Nilchi F., Postnikova О.V. |
| Structure and genetic types of void space in carbonate strata of the Ilam Formation (southwestern Iran) | |
| The Santonian-Campanian Ilam Formation plays a key role in the Bangestan Group within the Zagros petroleum basin and consists mainly of carbonate rocks. In this paper, based on the study of microfacies and diagenetic processes in the Ilam Formation belonging to one of the oil fields of the Persian Gulf. The main factors influencing the types of reservoirs and their spatial distribution are determined. During the study, about 200 petrographic thin sections of carbonate rocks were analyzed and 180 measurements of porosity and permeability were made. As a result of petrographic study, 12 microfacies were identified, reflecting four facies belts: intertidal zone, lagoon, shallow water and open marine zone. The conducted studies showed that diagenetic processes such as calcitization of void space, dolomitization, sulfation, leaching and compaction occurred in marine, meteoric and buried diagenetic environments. The petrophysical diagram of F.J. Lucia was used to classify the types of reservoir rocks. The results of this study demonstrate that the reservoir rocks of the considered field have pronounced heterogeneity in filtration-capacitive characteristics. This heterogeneity is due to both the sedimentation conditions, degree of change and direction of diagenetic transformations. Keywords: carbonate rocks, microfacies, diagenetic transformations, oil field, reservoir rock, F.J. Lucia petrophysical diagram, Ilam Formation, southwest Iran. |
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| article citation | Nilchi F., Postnikova O.V. Struktura i geneticheskie tipy pustotnogo prostranstva karbonatnykh otlozheniy formatsii Ilam (yugo-zapad Irana) [Structure and genetic types of void space in carbonate strata of the Ilam Formation (southwestern Iran)]. Neftegazovaya Geologiya. Teoriya I Praktika, 2025, vol. 20, no. 3, available at: https://www.ngtp.ru/rub/2025/27_2025.html EDN: RUCKIB |
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Dunham R.J. Classification of carbonate rocks according to depositional texture. In: Classification of Carbonate Rocks; ed. by W.E. Ham, AAPG Memoir 1. Tulsa, Oklahoma, pp. 108-121.
Esrafili-Dizaji B., Rabbani J. Geology of Iran’s hydrocarbon reservoirs. Avaie Zamin, Geological Association of Students, University of Tehran, 2007, vol. 3(7), pp. 6-11.
Flügel E. Microfacies of Carbonate Rocks. Analysis, interpretation and application. Second edition. Berlin: Springer-Verlag, 2010, 1006 p.
James G.A., Wynd J.G. Stratigraphic nomenclature of the Iranian Oil Consortium agreement area. AAPG Bulletin, 1965, vol. 49(12), pp. 2182-2245. DOI: 10.1306/A663388A-16C0-11D7-8645000102C1865D
James G.A., Wynd J.G. Stratigraphic nomenclature of the Iranian Oil Consortium agreement area. AAPG Bulletin, 1965. no. 49(12), pp. 2182-2245. DOI: 10.1306/A663388A-16C0-11D7-8645000102C1865D
Lucia F.J. Carbonate Reservoir Characterization: An Integrated Approach (2nd ed.). Berlin; Heidelberg; New York: Springer-Verlag. 2007, 336 p. DOI: 10.1007/s13202-020-00946-w
Lucia F.J. Rock-fabric/petrophysical classification of carbonate pore space for reservoir characterization. AAPG Bulletin, 1995, vol. 79, pp. 1275-1300. DOI: 10.1306/7834D4A4-1721-11D7-8645000102C1865D
Procter A., Sanderson D.J. Spatial and layer-controlled variability in fracture networks. Journal of Structural Geology, 2018, vol. 108, pp. 52-65. DOI: 10.1016/j.jsg.2017.07.008
Snidero M., Muñoz J.A., Carrera N., Butillé M., Mencos J., Motamedi H., Alireza Piryaei A., Sàbat F. Temporal evolution of the Darmadan salt diapir, eastern Fars region. Tectonophysics, 2019, vol. 766, pp. 115-130. DOI: 10.1016/j.tecto.2019.06.006
Wilson J.L. Carbonate Facies in Geologic History. New-York: Springer, 1975, 471 p. DOI: 10.1007/978-1-4612-6383-8