The hydrocarbon offshore field development is associated with a high level of uncertainty and risks due to natural and climatic conditions, technical and technological limitations, high capital and operating costs. In offshore conditions, monitoring and management of hydrocarbon field development also becomes a non-trivial task. One of such tasks is production allocation per reservoirs. This is necessary for monitoring and accounting of recoverable reserves by layers, localization of residual reserves, planning and implementation of the infill drilling and well intervention programs in order to manage and optimize field development. At the same time, production logging is not always technically possible or economically justified in marine conditions. This is due to the limited operational availability of a drilling rig on the platform, complex well trajectories and completions, and the high costs for well interventions in marine conditions. This work summarizes the results of oil geochemical analysis performed to monitor and manage Piltun-Astokhskoye field development. The field study using oil geochemical analysis covers the period from 1999 to 2023. As a part of the work done, the geochemical characteristics of oil of Piltun-Astokhskoye reservoirs were studied and the possibility of separation of oil from different reservoirs with gas chromatography was proved. The solution of this problem is a fundamental condition for quantitative production allocation using oil geochemical analysis.
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