Reservoir evaluation and saturation monitoring using RST fluid analysis for improve oil recovery

To manage existing fields as effectively and efficiently as possible, there is a need to monitor movement of formation fluids within the reservoir as well as production from individual wells. Result from the case study of an unnamed well in Nigeria using the data acquired with reservoir saturation tool (RST) and interpreted with GeoFrame petrophysical software was able to identified formation fluid contacts, define saturation of those fluids, and locate potential cased-off, bypassed oil. From the sigma mode interpretation there is no gas within the zone of interest. The cross plot of the near and far carbon oxygen ratio statistically plot in the lower left corner of the quadrilateral indicated the annulus hold up value of zero. The final C/O interpretation shows that the original oil water contact in the zone of interest has risen to 2302m and the flushed zone is between 2302-2308m. The section above this depth (2294-2298 m) is possibly at initial water saturation and offers a choice for future re-drill.