Determining hydraulic flow units by using the flow zone indicator method and comparing them with electrofacies and microscopic sections in Sarvak Formation in one of the fields of Abadan plain
Reservoir characterization and the identification of the main factors controlling the quality of the reservoir has an important contribution to providing a real image of reservoir properties. The Sarvak Formation is one of the most important reservoir rocks in the Zagros sedimentary basin and the studied well is divided into three core facies based on layering, texture, fossils, and sedimentary structure. In this study, first, using the porosity and permeability data of a well in this formation, hydraulic flow units were determined based on the flow zone indicator and then compared with the results of thin sections studies, effective factors on the quality of each flow unit were identified. The results of determining the hydraulic flow units based on the flow zone indicator indicate the existence of four flow units A, B, C, and D in Sarvak Formation, which increase the reservoir quality from units A to D, respectively. Then, the electrofacies of Sarvak Formation were determined using well log data which resulted in five electrofacies. By comparing electrofacies with flow units and the results of microscopic section studies, it was observed that Sarvak Formation has a high heterogeneity in the studied well due to various diagenetic processes such as dissolution, cementation, and dolomitization that using the concept of flow units and electrofacies and comparing with the results of microscopic section studies, it is possible to separate different parts of this reservoir that have the same flow characteristics and generalize the results to non-core wells in the study field.
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