Depositional environment, geochemistry and diagenetic control of the reservoir quality of the Oligo-Miocene Asmari Formation, a carbonate platform in SW Iran

• Autorzy: Omidpour Armin , Moussavi-Harami Reza , Loon van Antonius Johannes , Mahboubi Asadollah , Rahimpour-Bonab Hossain

Identyfikatory

DOI

10.7306/gq.1596

• Języki publikacji: EN

Abstrakty

EN

The Oligo-Miocene Asmari Formation in SW Iran represents sedimentation on a carbonate platform. Thin-section analysis allowed distinguishing 26 microfacies, which can be grouped into twelve microfacies associations that represent four main depositional environments: open-marine, outer-ramp, middle-ramp and inner-ramp settings. The carbonates have undergone a complex diagenetic history, from penecontemporaneous shallow-marine consolidation to deep-burial diagenesis. The most important processes that affected the carbonates are dolomitization (in different stages), cementation (by anhydrite and calcite), dissolution (fabric-selective and fabric-destructive), fracturing, stylolitization and neomorphism. Minor diagenetic processes that modified the sediments are pyritization, silicification, glauconitization, micritization and bioturbation. Diagenetic processes such as dolomitization, dissolution and fracturing improved the reservoir quality, whereas cementation and compaction have reduced the reservoir quality of the Asmari Formation. Whole-rock oxygen and carbon isotope analyses of limestone samples show that the isotopic composition of the carbonates was hardly affected by diagenesis and that the carbonates remained roughly in isotopic equilibrium with the Paleogene seawater. Some samples have, however, been affected significantly by diagenesis during deep burial in a closed to semi-closed diagenetic system.

Słowa kluczowe

EN

Asmari Formation; Shadegan Oil Field; reservoir geology; diagenesis; oil exploration

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2021
• Tom: Vol. 65, No. 2
• Strony: art. no. 27
• Opis fizyczny: Bibliogr. 87 poz., fot., rys., tab., wykr.

Twórcy

autor

Omidpour Armin

• Ferdowsi University of Mashhad, Department of Geology, Faculty of Sciences, Azadi Square, Mashhad, Razavi Khorasan Province, Iran

autor

Moussavi-Harami Reza

• Ferdowsi University of Mashhad, Department of Geology, Faculty of Sciences, Azadi Square, Mashhad, Razavi Khorasan Province, Iran

autor

Loon van Antonius Johannes

• Shandong University of Science and Technology, College of Earth Science and Engineering, Qingdao 266590, Shandong, China

autor

Mahboubi Asadollah

• Ferdowsi University of Mashhad, Department of Geology, Faculty of Sciences, Azadi Square, Mashhad, Razavi Khorasan Province, Iran

autor

Rahimpour-Bonab Hossain

• University of Tehran, School of Geology, College of Science, 16th Azar Street, Enghelab Square, Tehran, Iran

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).