Using a case study from the Sajaa Field in the UAE, the authors devised several workflows to establish a fully thermal dynamic simulation case for CO2 storage in a depleted gas reservoir. Several novel workflows were established during this study, including setting up dissolution tables for CO2 and impurities being injected, tabulating the enthalpy of each component, and computing reservoir and caprock formations’ thermal capacity and conductivity. The paper provides guidelines for thermal modeling for carbon capture and storage projects in a depleted gas field.
Introduction
Situated within the intricate fold/thrust belt of the Oman Mountains, the Sajaa and Kahaif gas-condensate fields are prominent hydrocarbon reservoirs characterized by the Cretaceous carbonate formations of the Thamama Group. Both fields are prolific gas and condensate hydrocarbon producers.
The Sajaa field is overlain by a thick sequence of the Nahr Umr formation, which serves as a competent and reliable seal effectively containing substantial volumes of hydrocarbons over geological timescales.
