فرايندهاي دياژنتيكي، محيط رسوبي و چينه نگاري سكانسي سازند فهليان در فارس نيمه ساحلي و فارس ساحلي

Diagenetic processes, depositional environment and sequence stratigraphy Fahliyan formation in subcoastal fars and coastal Fars

The fahliyan formation (lower cretaceous) is composed of carbonate reservoir Rocks, in south and westsouth of Iran. In order to study facies, depositional environment diagenesis processes and sequence stratigraphy in subcoastal fars and coastal fars two subsurface section Nar-2 and west Aghar have been studied petrographic and geophysical logs studies indicate that the fahliyan formation deposited in four faeied belts: Tidal flat (A), Lagoon (B), Barrier (C) and open Marine (D). Study of facies, their vertical and Lateral changes and comparison with modern and ancient environments indicate that the fahliyan formation deposited in a shelf carbonate platform with shallow environments. Sequence stratigraphy of the fahliyan formation in the aera indicates on the existence of two depositional sequence (3rd- order cycles). In the studies sections, the lower and upper boundary of the first sequence and the top boundary of the second sequence are type one unconformity (SB,). The main diagenetic processes include cementation, micritization, neomorphism, dissolution, compaction, dolomitization and bioturbation that belong to marine phreatic, meteoric phreatic and burial environments.