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Ponta Grossa-Itarare; an unusual gas system in the Parana Basin, Brazil



Ponta Grossa-Itarare; an unusual gas system in the Parana Basin, Brazil



Annual Meeting Expanded Abstracts - American Association of Petroleum Geologists 2001: 177



Petroleum systems in the Parana Basin are very complex to explore due to the geological peculiarities of this basin, especially because of the thermal influence of igneous intrusions on maturation of the source rocks. Recently, the wells drilled in the central-southern area of the basin have revealed good potential for gas. Those gas accumulations have similar chemical compositions with methane, ethane, propane, iso- and n-butane representing approximately 90%, 5%, 0.2%, 0.2%, respectively. Carbon isotopic compositions of ethane and propane, -33ppm vs. PDB, are compatible with the relatively 13C-depleted sources of the Ponta Grossa shales (Devonian). However, methane has an anomalous enrichment in 13C relatively to C1-C4 fraction suggesting higher levels of thermal maturity. Such chemical and isotopic signature is typical of a mixing of hydrocarbons generated under variable levels of thermal stress influenced by direct heat from igneous intrusions. The relationship between the carbon isotopic compositions of ethane and propane versus ethane/propane ratio suggest that secondary cracking, of preexisting hydrocarbons, was significant to this gas system. The objectives of this study are to characterize geochemically the gas produced from the Itarare and Rio Bonito formations in the central-southern part of the Parana Basin, and to infer their sources and possible secondary alterations.

Accession: 019748349

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