Abstract

Recent discoveries made in the presalt carbonates of southeast Brazil are among the most important in the past decade. This province, especially Santos Basin, contains large accumulations of oil with excellent quality and high commercial value. The latest seismic processing technologies, along with elastic inversion, have been used for reservoir characterization and in identifying carbonates with high-permeability intervals to model flow behavior of the reservoirs. One challenge encountered is identifying the occurrence of igneous bodies within the reservoir interval and their correct characterization as input into the reservoir modeling. Igneous rocks encountered in the Brazilian presalt can be of both intrusive and extrusive origin. They may present a variety of permo-porous reservoir properties ranging from being flow barriers to acting as high-permeability corridors if fracturing is high enough. The presence of igneous rocks is not common in Brazilian presalt carbonates; therefore, specific methodologies must be used, both in seismic processing and quantitative interpretation, in order to map and predict those occurrences.

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