comparison of sequence stratigraphy and depositional environment of asmari formation in the fars, khuzestan and lurestan areas of zagros basin

the asmari formation is a thick carbonate sequence in zagros foreland basin. it was deposited during oligocene – early miocene ages. in order to interpret the depositional environment and sequence stratigraphy, firuzabad section were compared with 4 sections of asmari formation in the zagros basin. four different sub environments were identified in the asmari formation based on microfacies analysis including tidal flat, lagoon, shoal, open marine. these depositional environments correspond to inner, middle and outer ramp. two third-order sequences have been recognized in the firuzabad section, on the basis of deepening and shallowing patterns in the microfacies and the distribution of the oligocene foraminifers. these sequences were correlated with the identified sequences of dehluran, mamulan, dill and tange-ab jahrum sections.