Microfacies, sedimentary environment and diagenesis of the Ilam Formation in an Oilfield of the Abadan plain

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ASADI MEHMANDOSTI ELHAM; Abdolmaleki Soheila; GHALAVAND HORMOZ

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Journal: APPLIED SEDIMENTOLOGY Year:2017 | Volume:5 | Issue:9 Page(s): 21-39

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Title

Microfacies, sedimentary environment and diagenesis of the Ilam Formation in an Oilfield of the Abadan plain

Author(s)

ASADI MEHMANDOSTI ELHAM | Abdolmaleki Soheila | GHALAVAND HORMOZ | Issue Writer Certificate

Keywords

ZagrosQ2

Ilam FormationQ2

Upper CretaceousQ2

sedimentary environmentQ2

DiagenesisQ2

Abstract

The Ilam Formation with Coniacian-Santonian ages is one of the petroleum reservoir in the Zagros basin and wide area of Khozastan plain, which mainly composed of carbonate rocks. In this study, the Ilam Formation in 3 subsurface sections with total thickness of 274 m was studied in one of the southwest Iranian oilfields. The lithology of this formation in studied wells is limestone with interbedded shale and clayey limestone. Sedimentological studies and facies analysis of 230 thinsections of drilling cutting lead to recognition of 11 microfacies and one shale petrofacies in 3 facies belts. These microfacies were deposited in lagoon, shoal and open marine facies belts. According to recognised microfacies and comparing them with same carbonate deposits in other places, absent of reef structures, sliding and slumping facies, the sedimentary envirnment of this carbonate sequence was recognised as a homocline ramp which consist outer, middle and inner ramps. The main diagenetic features of the Ilam Formation in studied oilfield are bioturbation, micritization, cementation, dissolution and porosity, dolomitization, stylolitization, pyritization and fractures. Main cement types in this formation are equant, drusy, blocky, syntaxial and vein filling cements which formed in marine, meteoric and burial diagenetic environments.

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APA: Copy

ASADI MEHMANDOSTI, ELHAM, Abdolmaleki, Soheila, & GHALAVAND, HORMOZ. (2017). Microfacies, sedimentary environment and diagenesis of the Ilam Formation in an Oilfield of the Abadan plain. APPLIED SEDIMENTOLOGY, 5(9 ), 21-39. SID. https://sid.ir/paper/260603/en

Vancouver: Copy

ASADI MEHMANDOSTI ELHAM, Abdolmaleki Soheila, GHALAVAND HORMOZ. Microfacies, sedimentary environment and diagenesis of the Ilam Formation in an Oilfield of the Abadan plain. APPLIED SEDIMENTOLOGY[Internet]. 2017;5(9 ):21-39. Available from: https://sid.ir/paper/260603/en

IEEE: Copy

ELHAM ASADI MEHMANDOSTI, Soheila Abdolmaleki, and HORMOZ GHALAVAND, “Microfacies, sedimentary environment and diagenesis of the Ilam Formation in an Oilfield of the Abadan plain,” APPLIED SEDIMENTOLOGY, vol. 5, no. 9 , pp. 21–39, 2017, [Online]. Available: https://sid.ir/paper/260603/en

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