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Significant amounts of hydrocarbon resources are hosted by the Lower Triassic Kangan Formation (Upper Khuff equivalent) in the southern part of Gulf. This carbonate gas reservoir is known to be a complex carbonate system with a high degree of heterogeneity, which has a direct impact on the reservoir quality. The formation consists mainly of limestone, dolomitic limestone, dolomite and evaporites. Combined core examinations and detailed thin section studies are used for facies analysis. Accordingly, 10 major facies were recognized in the Kangan reservoir. They are grouped as five facies assemblages deposited in supratidal, intertidal, lagoon, shoal and off-shoal environments. These facies associations reflect an ideal shallowing upward sequence. These facies are genetically related and indicate a gentle depositional gradient and morphology during deposition. Thus, they represent the shallow part of a homoclinal carbonate ramp (Figure 1). This interpretation is based on the characteristics of the constituent facies, lateral and vertical relations between sedimentary facies and the presence of thick succession of shallow-water deposits (high relative proportion of peritidal and lagoon versus open-marine facies).

Microfacies, Diagenesis and Reservoir Quality of Early Triassic Kangan Formation in Offshore Zagros: A Case Study