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The Ilam Formation Cenomanian to Santonian in age is considered one of themain rock reservoirs of the Bangestan Group in the southwest of Iran. Thisformation mostly consists of carbonate rocks. To examine the sedimentaryenvironment, diagenesis, sequence stratigraphy, and reservoir quality of IlamFormation in Dezful embayment and Abadan Plain, four subsurface sections inwells, were studied. The lithology of the Ilam Formation in the studied wellsis limestone with interbedded shale and argillaceous limestone. Considering theabundance of allochems and various fabrics in these deposits, twelvemicrofacies and one shale petrofacies of the Ilam Formation were recognized inthese four wells. These microfacies were deposited in three facies belts,namely lagoon, shoal, and open marine, in a homoclinal carbonate ramp setting.These deposits have been influenced by meteoric, marine, and burial diageneses.Sequence stratigraphy of the Ilam Formation reveals that the studied wellsconsist of a third-order sedimentary sequence. The sea-level fluctuations inthis area are the same as the global sealevel fluctuations. During the study ofthe Ilam Formation reservoir quality based on the results of diagenesis, mainlyporosity and permeability data in one of studied wells,six flow units wereidentified. Flow unit number five has the most potential reservoir quality, andflow unit number 6 has the undesirable flow unit.

Sedimentary Environment, Diagenesis, Sequence Stratigraphy, and  Reservoir Quality of the Ilam Formation in Dezful Embayment and Abadan Plain  in South-West Iran