| Popis: |
Five of the geologic horizons that yield oil in other parts of the world arerepresented in Brazil; namely, the Devonian, Carboniferous, Permian, Cretaceous, and Tertiary. Thus far, the first two have shown no evidences ofbeing oil bearing within Brazilian territory. Not enough exploring has beendone to permit trustworthy comparisons of the relative importance of thePermian, Cretaceous, and Tertiary as oil-bearing horizons in this country. Themost important, indeed almost the only, information available relates to thelocations of the areas and to the structural features of the several horizons.The theories regarding the physical conditions under which these rocks werelaid down, however, I regard of the utmost importance. Permian Rocks of Permian age cover an enormous area in Brazil, extending from RioGrande do Sul to Maranhao on the north, and to Matto Grosso on the west. ThesePermian rocks in many places are known to include oil-bearing shales and insome locations contain small veins of gilsonite. The geologic map of Brazilshows that the Permian area is widely distributed, but there is considerabledoubt about the origin of some of the rocks. Some of the lower Permian beds insouthern Brazil contain marine fossils, but in Minas no fossils have as yetbeen found in them, and in Bahia, at only one locality have a few Permianplants been found. Indications of oil have been found in the states of Sao Paulo, Parana, andelsewhere farther south, but wells drilled in the Permian of Sao Paulo near theMorro do Bofete did not find oil. One well has been started, by the BrazilianGovernment, in the Permian of Parana near Marechal Mallet, close to latitude26? south, but thus far oil has not been found. AIME 068–75 |
