عنوان مقاله [English]
Effect of diagenetic processes on the distribution of reservoir and non-reservoir units in the Asmari Formation, Ahvaz Oilfield (Wells No, X,Y,Z)
Various diagenetic processes have affected reservoir quality of the Asmari Formation in Ahvaz Oil Field. Asmari reservoir in wells (X, Y, Z) consists of 10 zones. Petrographic studies demonstrated complexity in diagenetic history of these wells. Meteoric diagenetic processes (including extensive dissolution, meteoric cementation) along with burial diagenetic features (including stylolite-related dolomites and burial cements) are the main diagenetic overprints that controlled the reservoir quality of Asmari Formation. Results show that in spite of primary controls of facies on permeability-porosity distribution, diagenetic processes have important role on final distribution of reservoir parameters of Asmari Formatin in Ahwaz Oil Field. Extensive meteoric dissolutions and fractures together with stylolite-related dolomitizations and dissolutions poikilotopic anhydrite cement and creation patchy anhydrite cement in the sandstone petrofacies bodies provided the best reservoir horizons.
Key words: Asmari Formation, Meteoric Diagenesis, Dolomitization, Reservoir Quality, Anhydrite Cement.