Abstract
Zagros Basin is a very important hydrocarbon region in the Iran and World. One of the major reservoirs in this basin is the Lower Cretaceous Dariyan Formation. Based on petrographic studies, 9 microfacies were determined and interpreted as related to lagoon, barrier island and open marine environments. Facies associations show deposition in a carbonate ramp. Sequence stratigraphy studies show two sequences, each one with a transgressive system tract, marked by open marine microfacies, and then a retrogradational highstand, marked by barrier and lagoonal facies. Paleogeography and sequence stratigraphy studies of this formation and correlation of it with other sections may provide useful information about reservoir characterizations.
Highlights
The Dariyan Formation is part of the Lower Cretaceous deposits of southwest of Iran
Lower and upper boundaries of Dariyan formation are transitional for the Fahliyan and Kazdomi Formations, respectively
Three facies belt were determined for the studied section, consisting of: A) Open Marine; B) Barrier Island; C) Lagoon (Figure 3 and Figure 4)
Summary
The Dariyan Formation is part of the Lower Cretaceous deposits of southwest of Iran. This formation is one of the important hydrocarbon reservoirs in the Zagros basin, southwest of Iran. This Formation is equivalent with Shaiba Formation in countries in south of Persian Gulf [1]. In the Fars region this Lower Cretaceous formation consists of shallow limestone with wackstone-packstone textures and is deposited in carbonate ramp environments [1] [2] [3]. Lower and upper boundaries of Dariyan formation are transitional for the Fahliyan and Kazdomi Formations, respectively
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