An operator drilling a deepwater well offshore Africa needed to evaluate potential pay zones in a thinly bedded sandstone reservoir. Because of good vertical connectivity, thinly bedded sandstone reservoirs can contribute to increased well production. However, evaluating potential pay zones within individual sandstone layers is challenging in such complex reservoirs.
Using the proVISION Plus magnetic resonance-while-drilling service, a thin-bed analysis was performed to interpret the porosity directly relating to well performance. This analysis would help in evaluating the well's reservoir volumes and capturing the contribution of each pore system.
The thin-bed analysis provided advanced interpretation of the deepwater reservoir's porosity. The relaxation T2 distribution information provided by proVISION Plus service enabled characterizing the two laminated sand - shale sequences, resulting in a 60% increase in calculated reserves. Net to gross and continuous permeability were also estimated for perforation interval selection and completion design optimization.
