An oil refinery is a complex process manufacturing system that needs to be efficiently supported at all levels by information systems and technologies.Aim. The presented study aims to formulate requirements for the IT services of oil refinery information systems in accordance with the architectural approach to enterprise management.Tasks. The authors analyze existing approaches to the formation of requirements for oil refinery information systems, outline functional requirements for oil refinery information systems, and develop a high-level architecture for the IT services of oil refinery information systems.Methods. The methodological basis of the study includes a service-oriented approach to analyzing the requirements of the enterprise management system for IT support.Results. The authors propose a model service-oriented architectural solution for the IT support of oil refining processes and formulate industry-specific requirements for IT services in BI, ERP, MES, and APC systems.Conclusions. By designing a service-based IT architecture for an enterprise, it is possible to implement an information flow management system that would meet current business needs, including an automated system. When designing the IT architecture of an oil refinery, it is important to pay special attention to manufacturing execution systems (MES) and automated process control systems (APCS). Implementations of such systems use IT solutions designed by developers specializing in the automation of oil refining enterprises.