Reservoir production allocation is one of the most important issues of the multilayer marine oil field development. The solution of the issue is determined by the need to monitor and report oil recovery per reservoirs, localize remaining reserves, plan and implement infill drilling and well intervention programs to manage oil field development. In the meantime, production logging is not always technically possible or economically feasible in marine conditions. Production logging is limited by drilling rig availability on the platform, used for all downhole operations, and the high costs of all well interventions. The complex logistics and the harsh natural and climatic conditions introduce additional complications and restrictions for offshore operations. This paper summarizes the experience of oil production allocation per reservoirs using oil geochemical analysis for Piltun-Astokhskoye oil and gas condensate field. The methodology was developed for quantitative assessment of reservoir contribution to oil production based on oil geochemical analysis for a binary system. The methodology is deployed for well and reservoir surveillance and management, and used for reservoir production allocation, remaining reserves localization, refining geological and hydrodynamic models, planning and control of infill drilling and well intervention programs.The Expert and Technical Council of the State Reserves Commission of the Russian Federation approved the methodology in November 2024.
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