Document Type : Original Research Paper

Authors

1 Assistant Professor, Department of Geology, Faculty of Science, University of Hormozgan, Hormozgan, Iran

2 Ph.D., Department of Geology, RIPI, Tehran, Iran

3 Ph.D. Student, Department of Geology, RIPI, Tehran, Iran

4 Assistant Professor, Department of Geology, RIPI, Tehran, Iran

5 Ph.D. Student, Department of Geology, Shahid Beheshti University, Tehran, Iran

6 M. Sc., Khazar Oil Company, Tehran, Iran

Abstract

Based on lithostratigraphy analysis, Cheleken Formation in the studied section of the Gorgan plain, subdivided into lower sandstone and upper mudstone/marl units. Based on petrographic analysis, the sandstone sediments include low textural and compositional maturity litharenite and sublitharenite. Conglomerates are polymictite orthoconglomerate with variables carbonate and chert grains. High percentage of the porosity as vuggy, channels and fractures in the sandstone and conglomerates and even mudstone deposits displays high reservoir potentional for the studied sediments and hence necessitates the exploration studies in the Iranian part of the SCB. Based on the youngest nannofossil species, a late Miocene to middle Pliocene (?) age is defined for the Cheleken Fm. in the studied area. Nannofossils distribution of the studied succession displays the SCB was connected to the Black Sea and Mediterranean Basin in the late Miocene- early Pliocene and the Pleistocene and was isolated in the main part of the Pliocene.

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