Kopet Dagh sedimentary basin is one of the promising areas for hydrocarbon exploration. Khangiran gas field producing gas and condensate from Surijeh (Lower Cretaceous) and Muzduran (Upper Jurassic) formation indicate that the area is atractive for further exploration activity.

On that basis, 160 outcrop samples were selected from various geological sections and different geochemical techniques were applied for source rock evaluation. Rock-Eval analysis of samples indicates that total organic carbon varies from 0.63 wt.percent in NW to 0.27 wt.percent in SE of the area. Organic petrographic studies and elemental analysis of Kerogen indicate that the organic matter are mainly type III with minor amount of type II. Variation in sandston to shale ratio and vitrinite reflectance study show that Kitchen area lies on the NE of the area and organic matter are at the catagenetic stage of maturation. The source potential index (SPI) was calculated using effective thickness and average genetic potential. SPI variations indicate that hydrocarbon potentiality increases from SE to NW of the area. Based on the various isothermal and isopach maps, charge factor and entrapment style system of migration of hydrocarbon was considered to be, undercharged laterally drained low impedance.

Introduction Result and Discussion

Kopet Dagh sedimentary basin Hydrocarbon prospect evaluation of a located in NE of Iran consist of more than sedimentary basin can be achieved by 6000 m thick sequences of sedimentary rocks important geologic factors, such as, adequate of mainly Mesozoic and Cenozoic ages. These Petroleum generation and expulsion from the sequences comprises of varies lithology and in source rocks, favourable migration, drinage part similar to the sedimentary deposits of geometry and existance of trap during and after Turan blocks. Kashafroud Formation (Middle migration of hydrocarbon from the source Jurassic) consists of 1300 to 3000 m thick rock. In present study after detailed field work, units of shale, sandstone and siltstone. Three 160 samples from four geological sections distinctive sedimentary facies namly shele were systematicaly selected to evaluate the facies, turbidite facies and prodelta facies are hydrocarbon potential of Kashafroud distinguished within Kashafroud Formation, Formation. Quantity, type, and maturation of deposited in deep marin to deltaic enviroments. organic matter and souece potential index Hydrocarbon potentiality of shale facies were (SPI) were studied and favourable area of carried out using varies geochemical hydrocarbon generation and accumulation techniques in term of quality and maturation of were delineated on the basis of genetic source rock

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