What is the Role of Volcanic Rocks in the Brazilian Pre-salt?

Brazilian Atlantic Passive Margins Basins have registered several volcanic events, which are very well documented in the most prolific Brazilian offshore basins of Santos and Campos. Although, volcanic rocks are usually not treated as potentials reservoir in Brazil, they have become very important to Pre-Salt exploration, since volcanic rocks have been found in several Pre-salt exploration and appraisal wells. These rocks act not only as barriers for carbonate sedimentary successions but also as potential reservoirs. Several wells drilled in Pre-Salt have found volcanic with reservoir properties and significant hydrocarbon columns. However, their economic viability has not yet been fully proved at the basin scale. Thus, understanding volcanic rocks petrology and recognizing their main characteristics such as lithotypes, geometry, porosity and facies distribution can be essential for success Pre-salt exploration, appraisal and development campaigns.