Formation Evaluation and Reservoir Characterization

Abstract

In this research, a comprehensive and integrated petrophysical analysis of a single and multi-oil wells has been interpreted using an available core data and wireline logging data with a view to characterizing the reservoir utilizing TechLog software. Petrophysical well log and core data were integrated and analyzed of the reservoir characteristics of (Jake S-2, Jake S-34, Jake S-28 and Jake S-3) Wells, Jake oil field of Block-6, Muglad basin Sudan. The study essentially determined reservoir properties such as lithology, shale volume porosity (Φ), permeability (K), fluid saturation, net pay thickness, from well logs and cores, which are variables that determine reservoir quality. Saturation, gross rock volumes and net-to-gross ratios identified five (5) hydrocarbon-bearing zones. Average water saturation values of the net pay is above 45%, while porosity values ranged between 23-30%, reflecting well sorted coarse grained sandstone reservoirs with minimal cementation, indicating very excellent reservoir quality. Fluid types defined in the reservoirs on the basis of resistivity log signatures higher than 25-30 ohm-m in the reservoirs of Jake south field. Core analysis for the reservoirs showed best fit with petrophysical models. petrophysical properties of the reservoirs in Jake south Wells are enough to permit hydrocarbon prediction.