--> Abstract: Comparative Geochemical Characterization of South American Oils Derived from Carbonate and Siliciclastic Source Rocks: A Paleoenvironmental and Biological Marker Approach, by M. R. Mello, A. R. Ordonhez, O. Gallango, and M. R. Rosso; #90987 (1993).

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MELLO, M. R., PETROBRAS/CENPES/DIVEX, Ilha do Fundao, Brazil; A. R. ORDONHEZ, Instituto Colombiano de Petroleo, Santander, Colombia; O. GALLANGO, INTEVEP, Caracas, Venezuela; and M. R. ROSSO, Yacimientos Petroliferos Fiscales, Buenos Aires, Argentina

ABSTRACT: Comparative Geochemical Characterization of South American Oils Derived from Carbonate and Siliciclastic Source Rocks: A Paleoenvironmental and Biological Marker Approach

A geochemical survey of South American sedimentary basins using a wide selection of oils and source rocks, ranging from Upper Devonian to Tertiary in age, has been carried out. The aims were to compare and characterize oils derived from carbonate and siliciclastic source rocks, to assess the depositional paleoenvironment of the source rocks and to correlate them with the reservoired oils. This approach was based mainly on the distribution and concentration of biological markers.

This study provides the recognition and differentiation of oil types derived from carbonate and siliciclastic source rock systems in South America's major sedimentary basins. The following oil types were identified: (a) Upper Devonian marine epicontinental type: in Solimoes (Brazil), Maranon and Ucayali (Peru), Santa Cruz (Bolivia), and Noroeste (Argentina) basins; (b) Upper Permian marine hypersaline type: in Parana basin, Brazil; (c) Upper Jurassic marine carbonate type: in Neuquen basin, Argentina; (d) Lower Neocomian to Aptian lacustrine fresh/brackish water type: in Reconcavo, Ceara and Potiguar (Brazil) and Cuyana (Argentina) basins; (e) Upper Neocomian lacustrine brackish to saline water type: in Campos and Espirito Santo (Brazil), and Neuquen and San Jorge (Argentina basins); f) Aptian marine hypersaline type: in Ceara, Potiguar and Sergipe basins, Brazil; (g) Albian marine carbonate type: in Para-Maranhao, Cassipore and Santos basins, Brazil; (h) Upper Cretaceous marine anoxic type: in Santos (Brazil), Maracaibo, Eastern Venezuela and Orinoco (Venezuela), Upper and Middle Magdalena, Putamayo and Llanos (Colombia), Oriente (Ecuador), and Ucayali (Peru) basin; and (i) Tertiary marine deltaic type; Foz do Amazonas (Brazil), Maracaibo (Venezuela), Cauca-Patia and Llanos (Colombia), Santa Helena (Ecuador), and Talara (Peru) basins.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.