The Dariyan Formation, with the age of lower Cretaceous, is one of the important hydrocarbon reservoir rocks of Khami Group in the Persian Gulf.

This reservoir was evaluated through studying microfacies, sedimentary environment, diagenesis processes, and reservoir characterization analyses.

Microfacies study led to the recognition of eight microfacies that are pertinent to three facies belts: lagoon, platform margin, and shallow open-marine. Gradual facies changes and absence of turbidite deposits indicate that the Dariyan Formation was deposited in a carbonate ramp environment.

Assessment of porosity and permeability according to microfacies, SEM, and conventional core analysis indicates that microfacies Dr-MF4, DR-MF3, and DR-MF2, related to proximal part of shallow open marine and platform margin facies belts, have good reservoir quality. Microporosity is dominant in most of the studied samples. The samples with this pore type do not have enough permeability to make a good reservoir zone unless another pore type (such as interparticle and vuggy porosities) enhances the reservoir characteristics.

This formation mainly consists of allochemical porous limestone with high oil-show in upper parts (i.e. above oil water contact), while the strata are composed of white chalky limestone with no oil-show below oil water contact.


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