«Geology, geophysics and development of oil and gas fields»

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

UDC: 553.98(55)
DOI: -

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia

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

Annotation:

The data of an exploratory well located in one of the fields of the Persian Gulf were used for researching diagenetic processes of Ilam formation. 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 of the rocks, that compose the Ilam formation, were studied in two sections: Tang-e-Ban and Tang-e-Abolfares, located in the southwestern Iran. The main diagenetic processes manifested in the deposits of the Ilam formation are leaching, cementation, compaction, micritization, bioturbation, ferrugination, silicification, dolomitization as well as presence 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-filling and shaped-element cement as well as crustifying cement. The processes of Ilam formation diagenesis 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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