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An important objective of a surveillance programme for a gas condensate reservoir is to accurately assess reservoir pressure depletion over time. However, partial-to-complete isolation of zones throughout such a reservoir complicates the collection and interpretation of reservoir pressures from pressure transient analyses alone. As a result, production logs are run to obtain zonal flow contributions to understand the status of zonal pressure depletion. Understanding these zonal contributions and their implications on zonal pressures requires an integrated knowledge of the geologic and operational controls on flow.Integrated Geologic and Engineering Modeling Studies (iGEMS) is a workflow designed to provide this integration and, thereby, increase the value of surveillance data. iGEMS focuses on identifying well-level geologic and operation controls on flow. iGEMS uses an efficient process to rapidly create, run, and analyze single-well simulations that include the effects of boundary pressures and compositions inherent in the parent model.A case study utilising the iGEMS workflow is covered in this paper. This case study provides a specific example of how iGEMS teams identify geologic and operational controls on reservoir performance and develop a better understanding of zonal pressure differences. iGEMS provides insights on these controls by using reservoir modeling as a tool to integrate surveillance data, well logs, core data and geologic observations. Understanding what is controlling flow in the reservoir helps engineers, geoscientists, and petrophysicists make better operating decisions to maximise reservoir performance.

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