Print this pageOil Shale from the Tremembé Formation, Taubaté Basin, Brazil
Several Brazilian basins present deposits of pyrobituminous shales, which had been investigated in the last decades for their economic exploration for industrial extraction. Such deposits are related to the Irati Formation (Permian of the Paraná Basin), Codó Formation (Aptian of the Parnaíba and São Luiz Basins) and Tremembé Formation (Oligocen of the Taubaté Basin). We discuss with more detail the oil shale of the Tremembé Formation, in the light of new geochemical data obtained from boreholes drilled in the depocenter of Taubaté Basin. The focus of the research was the interval (ca. 50 m thick) of higher concentration of organic matter of the drilled unit. TOC, total S, major, minor and trace elements and Rock-Eval pyrolysis analyses were carried out. Based on these data, a high-resolution chemostratigraphic analysis was performed, which make possible to recognize ten chemostratigraphic units, which were correlated in the two studied wells. On the other hand, the application of chemostratigraphy to sequence stratigraphic analysis also proved to be a very effective tool (four 5th order sequences were identified). Based on TOC and Rock-Eval data, two intervals were selected for economic exploitation and industrial processing.
AAPG Search and Discover Article #90100©2009 AAPG International Conference and Exhibition 15-18 November 2009, Rio de Janeiro, Brazil