It is common to observe thin oil zones with limited thickness between the gas cap and the bottom water in gas-condensate reservoirs. The existence of thin oil zone must be taken into account in the development plan of the gas-condensate reservoirs, as this nuance has a significant influence on the recovery factor of reservoirs.
The objective of this paper is to understand the influence of thin oil zone to the development of the gas-condensate reservoirs in the South Caspian Basin. A numerical 3D hydrodynamic reservoir model has been built and sensitivity analysis has been performed for different reservoir properties. The results of the cumulative gas and condensate production were studied in terms of the reservoir total recovery factor to show the impact of different reservoir properties.
According to the results, it is crucial to study and understand the thin oil zone in gas-condensate reservoirs, as the presence of thin oil zone increases the reservoir recovery. Even not produced separately, the thin oil zone has positive influence on the development of gas-condensate reservoirs.
Additionally, the sensitivity study shows that the properties such as the reservoir absolute permeability, the thickness of the oil zone, the aquifer strength, the critical gas saturation, the critical water saturation and the residual condensate saturation have an essential influence on the final results even if the thin oil zone exist in the gas-condensate reservoirs. From the reults, it can be inferred that, although the thin oil zone has a positive impact on the gas-condensate reservoir recovery, the above mentioned properties also must be investigated and taken into account.