Perpustakaan Digital ITB

This study examines the challenge of estimating water saturation (????!) in reservoirs that contain tight carbonate intervals. The production zone mainly comprises deltaic sandstones with minor claystone and a thin layer of tight limestone identified only between 3464 and 3468 ft. This limestone is marked by high density, low porosity, and a stable gamma ray response. Several ????! models were evaluated, including Archie, Waxman-Smits, Simandoux, and the Indonesian equation. Results indicate that Archie tends to underestimate ????! by not adequately accounting for shale and microporosity, while Waxman-Smits may overstate clay conductivity effects due to ????! corrections that do not reflect the conduction mechanism in tight limestone. The Simandoux model produced the most consistent estimates, yielding ????" values around 0.34. These are reasonably close to the fractional flow calculations of approximately 0.219, which were derived from a different well in the same field. Meanwhile, the Indonesian equation gave slightly higher values near 0.40. These findings highlight the need to apply suitable saturation models in tight carbonate settings to achieve reliable estimations that can guide effective reservoir development.