In order to determine the MICROFACIES and sedimentary environment of the Ilam formation, one stratigraphic column in SW of Semirom (Landaran Anticline) was sampled and studied. Sediments of the Ham formation in the area are dominantly of limestone and marly limestones. Study of petrography indicates that carbonate sediments of the Ilam formation can be divided into 8 groups of carbonate MICROFACIES. Microscopic studies and field obserbations show that the carbonate MICROFACIES form in four sub - sedimentary environments, including: Open marine, Barrier, Lagoon and Tidal Flat. The absence of build-up, slump and turbbidite currents indicate that the carbonate platform of the Ilam formation is a homoclinal ramp. presence of rudist debries indicates a protozoan assemblage and suggests a tropical condition for deposition of the carbonate sediments.

The Lower Miocene Asmari Formation in Lali oil field, 40 kilometers NW of Masjed-e-Soleyman, is a thick sequence of limestone, argillaceous limestone and dolomitic-anhydritic limestones. At the mentioned area, it lacks the Lower Asmari but contains the Kalhur member and basal anhydrite. The study of the Asmari thin sections from available cores and cuttings at wells no. 20 and 22 of Lali oilfield led to the recognition of 10 MICROFACIES, related to six facies zones, including: supratidal, intertidal, shelf lagoon, barrier or shoal, shallow open marine and basin margin. The Asmari Formation represents sedimentation on a homoclinal carbonate ramp. Diagenetic processes in the Asmari Formation are: physical and chemical compaction, cementation, dissolution and production of mainly vuggy and channel porosities, neomorphism, dolomitization, anhydritization, fractures, micritization and biogenic processes. Fractures have had major effect on the quality of the Asmari reservoir, but vuggy and channel porosities, having less development, have played a less important role in reservoir quality. Results from this study have led to the recognition of marine, meteoric and burial diagenetic environments.

In this study, the Sediments of Taleh-Zang Formation was investigated in South West of Khoramabad. The thickness of Taleh-Zang Formation in Qalebi section measured 200m. In this section the sediment of Taleh-Zang Formation is isoclines between Amiran Formation at the base, and Kashkan Formation at the top. This Formation composed of gray limestone with chert nodules and Sandy Limestone. The study of samples taken from the studied section led to identification 28 genera and 4 species of benthonic Foraminifera and 6 genera and 2 species of green algae. The benthonic Foraminifera of the measured section were used to recognized the age of Succession and justify their correlation Based on the recognized Foraminifera such as Miscellanea miscella. The Qalebi section is Comparable to biozonation introduced by Wynd (1965). It is analogous to Miscellanea – Kathina assemblage zone (No# 43). According to distribution of the index Foraminifera, the age of the Sediments in Qalebi Section is Thanetian.

In order to study facies and sedimentary environment of Mobarak Formation in Kiasar, 75 km Southeastern Sari, a stratigraphy section, 250 m thick, was selected, which included thin to thick layers of limestone and of dolomite, shale and marl. Its lower contact includes shale and thin to thick layers of limestone with hemoclinal conformity overlies Geirud Formation (Upper Devonian) and its upper contact includes thick beds of shale covered by disconformity with sandstone of Dorud Formation (Lower Permian). For field sampling, the best path was chosen, and following sampling and studying the petrographic characteristics, thin sections were supplied from samples, and the microscopic features of the samples were studied. This study shows that these sediments may have been deposited in hemoclinal ramp that consists of 4 MICROFACIES assemblages and 19 subfacies. These lithofacies indicate that sedimentation must have occurred in open marine, bar, lagoon and tidal flat subenvironments.

The studied area is 30 Kilometers from western Abarkuh and near the south-east Abadeh between Yazd and Fars province. Permian sedimentary rocks in this area have about 1200m thickness covered by Triassic rocks. These eleven sedimentary MICROFACIES are recognized through studying these rocks. These eleven MICROFACIES occurred in four groups including open marine, bar, lagoon, and tidal flat and each of these MICROFACIES owns the characteristics of one of them. Sea level changes caused these MICROFACIES and accommodation changes produced a sequence with 7 sedimentary cycles (3-order).  

In this research, totally 610.4 meters of the Asmari Formation are studied in two stratigraphic sections on Bavan Mountain and Sarvestan section in Fars province, Iran. The indexed MICROFACIES are carefully determined through studying of 230 thin sections. This research shows that the indexed MICROFACIES are mudstone, wackestone, packstone, prainstone and the amount of MICROFACIES elements such as bioclasts, pellets, extraclasts and intraclasts. They are varied in different parts of the studied sections and the total amount of bioclasts in the section is more than other elements. The abundance of benthic bioclasts represents the regression of the basin from the open sea into the sub tidal and intertidal zone.

Tarbur Formation in the east of Lordegan includes mainly limestone, 182m thickness.Tarbur Formation lower contact with Gurpi Formation is disconformity and Upper contact with Pabdeh Formation, graded. Age of Tarbur Formation based on index fossil is Middle to Upper Mastrichtian (Upper Cretaceous). MICROFACIES include grainstone, wackestone to packstone and wackestone that shows open marine, bar (reef) and lagoon environment in the study area. Tarbur Formation in the study area deposited in Epicontinental platform.

The Ilam Formation in southwestern Khorram Abad with a thickness of up to 204 meters consists of uniform limestones with Middle Turonian to Early Campanian age which were deposited in a continuous sedimentation process. In this section, the Ilam Formation has continuous and transitional contacts with the Sourgah Formation in the lower boundary and the Gurpi Formation in the upper boundary. In the present study, 9 genera, 30 species and 2 biozones of the planktonic foraminifera have been recognized. The Ilam Formation in the studied section consists of a shaly facies and three carbonatic MICROFACIES include mudstone, wackestone and packstone containing planktonic foraminifera. Shaly facies and mentioned MICROFACIES were deposited in deep-open marine, which formed in a quiet environmental condition and increased environmental energy in MICROFACIES with mudstone texture toward MICROFACIES with wackestone and packstone textures. Whereas in the studied section recognized MICROFACIES are not related to parts of continental shelf, such as; bar, lagoon and tidal flat, therefore it could be said that, the studied area was part of profound depositional basin in Middle Turonian to Early Campanian.

In order to interpret the facies, depositional environment and sequence stratigraphy of the Sarvak Formation (L. Albian-Cenomanian in study area) in SW Brojen area, one stratigraphic section were studied. Eight different MICROFACIES have been recognized, which can be grouped into four depositional environments: tidal flat, lagoon, shoal and slope. The Sarvak Formation represents sedimentation on a carbonate ramp. Three third-order sequences are identified in the Sarvak Formation, on the basis of deepening and shallowing patterns in the MICROFACIES. The upper part of the Kazhdumi Formation is considered as the TST of sequence 1. The boundary between Kazhdumi and Sarvak formations is considered as mfs. The HST of sequence 1 is recorded in the Sarvak Formation. The SB between sequence 3 and overlying formation (Gurpi Formation) is considered as SB1.