Evaluation of Shale Effect on Saturation Exponent from Well Logs in an Offshore Field, Niger Delta.
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Description
Hydrocarbon recovery is subject to various elements set to validate not only the availability of the type
of fluid present at the subsurface, but also how saturated is the host rock with the fluid. A study on saturation
was carried out on the hydrocarbon locked in reservoirs of the N-1 and D-1 wells. The water saturations were
determined using various saturation equations by various authors from literatures. This evaluation led to the
determination of the permeability of the reservoirs through the Timur equation and the values were within the
range 222.8mD-2518.5mD in well N-1 and 434.4mD-2534.3mD in well D-1. The 7 pay zones of both wells
showed a high correlation based on the petrophysical parameters which could be the basis of a conclusion of
lateral continuity across the reservoir although the formations interpreted are characterized by clay fingering.
An analysis carried out for the determination of the permissible range of the saturation exponent ‘n’ used and
assumed as 2 which agrees with that in the basic Archie equation, but for the BOD-1b zone of D-1 with both
values 1 and 2 perfectly matching.
Keywords
TA Engineering (General). Civil engineering (General), TP Chemical technology