ORGANIC FACIES CHARACTERIZATION OF A SEDIMENTARY SUCCESSION OF THE OLIGOCENE TREMEMBE FORMATION, TAUBATE BASIN.

ORGANIC FACIES CHARACTERIZATION OF A SEDIMENTARY SUCCESSION OF THE OLIGOCENE TREMEMBE FORMATION, TAUBATE BASIN. The main objective of this article was the organic facies characterization of an Oligocene sedimentary sequence, belonging to the Tremembe Formation (Taubate Basin, east of Sao Paulo State, Brazil). To achieve that, 30 samples of sedimentary section with a depth of approximately 600 m were used, aiming to characterize the association of kerogen components using microscope techniques (transmitted white light and incident blue/ultralight light), and organic geochemistry (total organic carbon - TOC). In the sedimentary section studied, there was a predominance of particulate organic components from the palynomorph group, in relation to the total organic material, followed by components from the amorphous organic matter (AOM) and from the phytoclasts group. The palynomorph group is dominated by fresh water lacustrine algae from the Pediastrum and Botryococcus genera. The results of the geochemical analysis indicate grades of TOC and total Sulfur (TS), with values up to 44.0% and 1.4%, respectively. The integration of these results together with the organic facies parameters indicates that the analyzed sedimentary section represents a variation from a freshwater lacustrine environment with oxidant regime to a restricted saline lacustrine, environment with a disoxic-anoxic regime.