Geochemical monitoring of oil molecular composition during field development for geological model updating and optimization of horizontal wells performance

Applying geochemical techniques to complex of geological exploration opens wide opportunities for controlling the field development and operation. For example, molecular studies make it possible to understand complex oil reservoirs, find vertical and lateral connectivity, trace oil migration, determine the proportions of commingled production from multiple zones. This paper presents an example of geochemical monitoring of oil from the wells of the Caspian Sea water area. Geochemical survey were based on study of molecular composition of paraffins in gasoline fractions of oil. The molecular composition of oil samples obtained from different wells in period from 2016 to 2020 has been compared. The possibility of identification whether hydrocarbon fluid belonged to the working formation is shown.