Attribute Analysis of an area below seismic resolution - a case history from the Peregrino field

The capability of interpreting a reservoir is highly dependent of seismic resolution. The Peregrino Field is challenging with a Carapebus sand reservoir onlapping the Macae Group. The stratigraphic trap gives a pinchout line length of approximately 30 km. The Top Macae has strong acoustic impedance contrast with the layers above and dominates the seismic response, since the impedance contrast of the reservoir sands and the cap rock is much smaller. Determining the pinch-out of the reservoir is very challenging due to the limitation in resolution. Two appraisal wells have proved good reservoir sands in the area below tuning thickness, and the aim of this paper is to demonstrate how the well data were used to perform synthetic seismic wedge modeling and how the results were applied in an attribute analysis study of the real seismic data.