Biostratigraphy of Upper Permian-Lower Triassic Reservoir Units in one of the South Pars Field wells

In this study, the biostratigraphy of the reservoir sediments of the upper part of the Dalan Formation (Late Permian, Lopingian) and the reservoir part of the Kangan Formation (Early Triassic) from one of the well in the northern part of South Pars field are studied. The results of studies are presented as three local biozones recognized and defined. Based on these studies, a Late Permian age (Dorashamian/Changhsingian) for the upper Dalan Member an Early?—Middle Triassic age (Scythian?—Anisian) for the lower part of the Kangan Formation, suggested. Also, based on microfossils stratigraphical distribution, and studying succession and continuity of locally defined biozones, it was distinguished a hiatus between Dalan and Kangan formations. Therefore it could be mentioned that the Dorashmian age is the youngest part of the Dalan Formation.