Oil-Bearing Reservoir Revealed in the Sergipe Basins Farfan Area

Petrobras has confirmed its Sergipe Basin’s Farfan appraisal well has encountered a new shallower 68 m thick light oil bearing reservoir [ENERGY-PEDIA].

Broadband processing and AVO analysis recently carried out by Spectrum have enabled high quality imaging at reservoir levels. The exciting new reservoir announced by Petrobras indicates new potential at shallower depths where broadband processing can help image these oil bearing reservoirs and extrapolate the play throughout the basin in combination with available AVO studies.

Spectrum has reprocessed 8,200 km of seismic in 2013 and acquired 16,000 km of long offset 2D in 2014 in the Sergipe Basin. The data was processed through both conventional and broadband techniques including proprietary pre migration de ghosting and post-migration/post-stack bandwidth extension phases which have all enhanced the imaging. The application of these two technologies has resulted in seismic data with a vertical resolution as fine as 5m to 10 m and which has resulted in increased detail. Broadband processing has allowed previously indiscernible potential source rock and reservoirs to be better imaged.

With conventional seismic data, identification and subsequent interpretation of thin stratigraphic beds such as those found in the Sergipe Basin, have previously been limited by inadequate resolution at reflecting interfaces. Recent advances in processing technology allow for conventionally acquired seismic data to benefit from increased bandwidth and corrected ghost wavefields, giving more usable high and low frequencies. This extension in bandwidth can lead to seismic images that reveal more detailed geologic events and this can be observed in Spectrum’s dataset.

Geotrace_Figure5 Geotrace_Figure6

Right: Enhanced resolution on Sergipe 2014 Line 1330 before (upper) and after (lower) broadband processing.

Left: Seismic sections before (upper) and after (lower) broadband processing. The spectra show the normal bandwidth data in blue and the broadband data in red.

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