«Proceedings of Gubkin University»

Types of diаgenetic changes in carbonate sediments of the Ilam formation within the Bangestan structural zone (Iran)

UDC: 552.54
DOI: 10.33285/2073-9028-2023-3(312)-56-67

Authors:

¹ National University of Oil and Gas “Gubkin University”, Moscow, Russian Federation

Keywords: Zagros basin, Bangestan, Ilam formation, diagenesis, carbonate formations, natural reservoirs

Annotation:

The Ilam Formation, of Santonian-Campanian age, is one of the main reservoirs of the Bangestan group in the Zagros oil-bearing basin and is composed mainly of carbonate rocks. Diagenetic changes in the rocks that make up the Ilam Formation were studied in two sections – Tang-e Ban and Tang-e Abolfares, located in southwestern Iran. The main diagenetic processes manifested in the deposits of the Ilam Formation are leaching, cementation, compaction, micritization, bioturbation, ferrugination, silicification, dolomitization, and formation of glauconite. The following types of void space were identified: intra-form, inter-form, fracture, channel leaching zones and caverns. The most important types of cement in this formation are poikilite cement, pore-fill and shaped-element cement, as well as crustifying cement. The processes of diagenesis of the Ilam Formation proceeded under various conditions, including marine, meteoric, and buried environments. There are three stages of rock transformation: early diagenesis, late diagenesis and hypergenesis.

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