Direct hydrocarbon detection experiment in Potiguar Basin

Authors

Ionildo Macedo Veras, Roberto Dittz Chaves and Adelson Santos de Oliveira (PETROBRAS), Reto Holzner (Spectraseis), René Graf (Proseis AG).

Published at

Ninth International Congress of the Brazilian Geophysical Society

Publication date

11 September 2005

Abstract

From March to May 2004 Petrobras performed a “blind-test” experimental geophysical survey in Potiguar basin, Brazil using hydrocarbon microtremor technology. Non-calibrated maps were compared with PETROBRAS knowledge, concerning the study area. The technology demonstrated for this specific area a correlation of over 50% for the uncalibrated maps, and over 85% as expected for the calibrated maps, when we superimpose the potential maps generated by Spectraseis over the existing Petrobras reservoir maps, as understood today; excellent results given the harsh conditions under which the campaign was carried out. It is expected that the method can reach consistency levels as high as 90% with the known potentials, which provides HyMAS a confidence value very high when compared with conventional seismic (indirect) methods.