The present study investigates the geochemical properties of potential source rocks in the eastern Caspian Basin from Alborz structural zone. For this purpose, sections of Suchelma and Purva in south of Neka and an outcrop in south of Sari were selected. The studied samples of sedimentary source rocks of the Paleocene age were analyzed based on Rock-Eval analysis method. The results of Rock- Eval pyrolysis and organic petrography results of probable source rock sediments in one of the exploration wells of Gorgan plain were also studied. According to the results, most of the outcrops samples are immature and were deposited in a regressive continental environment. The samples of exploration borehole studied, are good in terms of organic matter richness but in terms of the amount of kerogen maturation are immature. According to the results of this study, these samples have weak hydrocarbon generating power and total organic carbon content of about 1% as well as kerogen type III. It was also specified in the determination of organic facies that most of the mentioned samples show deep environmental conditions adjacent to orogenic and continental sites and are deposited in a regressive environment.
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