The present study focuses on facies analysis and the reservoir characteristics of the Asmari Formation in the Aghajari oilfield -located in the Zagros fold-thrust belt, southwest Iran-, and how they are linked to depositional environments and reservoir characteristics. This formation consists of about 380 m carbonates with some siliciclastic intercalations. Based on the integration of 1200 m of core description and petrographic analyses of 2500 thin sections, 9 carbonate and 1 evaporite microfacies along with 2 siliciclastic petrofacies were identified. Facies analysis shows that the Asmari Formation sediments were deposited in a homoclinal carbonate ramp within open marine -facies association A-, shoal -facies association B-, restricted lagoon -facies association C-, tidal flat -facies association D-, and beach -petrofacies E- environments. Macroscopic and microscopic studies reveal that the main porosity types include interparticle, growth framework, vuggy, intercrystaline, moldic and fracture. Based on Routine core analysis -RCA-, porosity of the studied reservoir varies from 0.001 to 25.8%, with an average of 12.5%. The permeability ranges from zero to 1514 mD with an average of 94.27 mD. There is a good relationship between trend of mercury injection capillary pressures -MICP- and depositional environment. Therefore, facies deposited

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