Microfacies Analysis and Depositional Environment of Yamama Formation in ER Oilfield, Southern Iraq

Diyar F Abbas; Hamid A.  Alsultan; Amer A.  Alkhalidy

Article Details

Microfacies Analysis and Depositional Environment of Yamama Formation in ER Oilfield, Southern Iraq

Authors:

Diyar F Abbas | Hamid A. Alsultan | Amer A. Alkhalidy

Publisher:

Iraqi Geologists Union (Union of Iraqi Geologists)

Journal:

The Iraqi Geological Journal Vol.58 Issue 2F, pp.114-128

Document Type:

Article

Publication Date:

12/2025

Document Language:

English

Document ID (Org No.):

2001836933

pISSN:

2663-8754

Keywords:

Abstract:

 The Yamama Formation was deposited in the Early Cretaceous and is a member of the Late Berriasian-Aptian succession. 180 thin sections were made in ER Oilfield for the two wells Er-1 and Er-9, and it was found by examining these thin sections under the microscope that the formation consists of six main microfacies, which are lime mudstone, mudstone to wackestone, wackestone, packstone, grainstone, and rudstone microfacies, and fourteen submicrofacies, which are unfossiliferous lime mudstone, bioclastic wackestone, algal wackestone, algal packstone, benthic foraminiferal packstone, peloidal grainstone and other submicrofacies. Depositing in a variety of environments, starting from peritidal, lagoon, shoal, restricted, shallow open marine, and mid-ramp environments. The most significant diagenetic processes that affected the formation were dissolution, dolomitization and cementation, in addition to other processes such as micritization, compaction, neomorphism and mechanical fragmentation which in turn affected the porous system of the formation and led to the development or deterioration of porosity, such as moldic porosity, fracture porosity, channel porosity, and vuggy porosity, as the predominant porosity in the formation was fracture and moldic porosity.

Article Details

Microfacies Analysis and Depositional Environment of Yamama Formation in ER Oilfield, Southern Iraq

Authors: Diyar F Abbas | Hamid A. Alsultan | Amer A. Alkhalidy

Publisher: Iraqi Geologists Union (Union of Iraqi Geologists)

Journal: The Iraqi Geological Journal Vol.58 Issue 2F, pp.114-128

Document Type: Article

Publication Date: 12/2025

Document Language: English

Document ID (Org No.): 2001836933

pISSN: 2663-8754

Microfacies Analysis

Depositional Environment

Yamama Formation

Southern Iraq

Issues

Authors:

Diyar F Abbas | Hamid A. Alsultan | Amer A. Alkhalidy

Publisher:

Iraqi Geologists Union (Union of Iraqi Geologists)

Journal:

The Iraqi Geological Journal Vol.58 Issue 2F, pp.114-128

Document Type:

Article

Publication Date:

12/2025

Document Language:

English

Document ID (Org No.):

2001836933

pISSN:

2663-8754