فهرست نشریات علمی دسترسی آزاد ایران

The Oligo-Miocene Asmari Formation is the most prolific reservoir in the Dezful Embayment, southwest of Iran. Depositional and diagenetic effects on reservoir quality in the sequence stratigraphicframework were carried out on the basis of petrographic investigation, petrophysical logs, and coremeasurement porosity and permeability data. Petrographic analysis resulted in the identification of 12microfacies classified in 5 sub-environments including tidal flat, lagoon, barrier, shallow open marineand basin, which indicate deposition in a homoclinal ramp setting. Tidal flat, lagoonal and barriermicrofacies are mostly present in the upper and middle parts of the Asmari Formation, while outer rampmicrofacies largely developed in the middle part. Anhydrite and calcite cementation, compaction,dolomitization, dissolution, and fracturing are the main diagenetic controlling factors on petrophysicalproperties. Fracturing, dolomitization, and dissolution are contributed to reservoir quality enhancement,while compaction and cementation had negative effects on reservoir quality. The studied successionsare represented by 3 third-order sequences of early Aquitanian, late Aquitanian and early Burdigalianages that largely deposited in the highstand systems tract (HST) stage