Reconstruction of Sedimentary environment of Faraghan Formation in Darang#1 well

In this study the sedimentary environment of the Faraghan Formation has been investigated in Darang#1 well. Petrography studies of the cuttings led to the identification of five petrofacies that according to their abundance include: lithic arenite, quartz arenite, greywacke, hybrid arenite and mudstone. More than 90 percent of this succession is composed of lithic arenites including volcanic fragments and fine grained quartz arenite. In this study, we combined petrofacies analysis and gamma ray logs to reconstruct sedimentary environment of the formation. According to our data, six sedimentary facies has been identified. Depositional environment for the Faraghan Formation is proposed as upstream parts of delta plain to delta front in the lower part and shallow marine in the upper part of the succession which grades upward into a carbonate shelf (Dalan formation).