Evolução térmica e paleofluídos dos folhelhos da Formação Serra Alta na borda leste da Bacia do Paraná

Teixeira, Carlos Alberto Siragusa

doi:10.11606/d.44.2014.tde-26092014-101814

Cited by 5 publications

(6 citation statements)

References 15 publications

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“…A maturidade térmica dos folhelhos da Formação Irati é altamente variável (imatura a supermatura) e para maioria dos estudos, os episódios de geração de hidrocarbonetos está relacionada ao magmatismo da Serra Geral (Araújo, 2000;Nomura, 2014;Teixeira, 2014). No entanto, outros estudos sugerem a existência de um sistema de hidrocarbonetos já no Permiano (Mateus et al, 2014;Matos et al, 2017), por combinação de gradiente geotérmico e eventos hidrotermais.…”

Section: Evidências De Geração De Ch4 Biogênico Na Formação Iratiunclassified

Influência da temperatura na geração biogênica de metano e dióxido de carbono na formação Irati, permiano da bacia do Paraná

Almeida¹

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Methane (CH4) and carbon dioxide (CO2) have great environmental and economic importance due to their contribution to the greenhouse effect and climate change, but also as energy resource, in the case of CH4. From the energy point of view, recognizing the different sources of CH4 in sedimentary basins has a crucial factor in assessing the world's natural gas reserves, since the current estimates of hydrocarbons accumulations in sedimentary basins are based on thermogenic generation of hydrocarbons. However, few studies evaluate the importance of CH4 and CO2 generation as a product of organic matter biodegradation in sedimentary basins. This issue has great relevance to improve the estimates about the geological accumulations of CH4 and CO2. Temperature is one of the most important factors affecting microbial growth and biogeochemical processes responsible for CH4 and CO2 generation in subsurface environments. In this context, the Irati Formation (Permian of the Paraná Basin) in southern of South America represents one of the most organicrich shale around the world, reaching up to 23% of total organic carbon (TOC) and covering an area of approximately 700.000 km 2. The thermal history of this important geological carbon pool is atypical because it depends not only on the burial history, but also on the emplacement of igneous bodies during the Early Cretaceous. In this study, shale samples of the Irati Formation were used in incubation experiments performed under different temperatures (22°C, 50°C, 70°C and 80°C) to evaluate the influence of thermal conditions on biogenic generation of CH4 and CO2. Higher temperatures promoted higher production rates of CH4 and CO2. Biogenic CH4 production was more efficient when shale samples were incubated at 80°C, with a maximum yield of 2.45 ml/t.d compared to 0.49 ml/t.d at 22°C, 1.75 ml/t.d at 50°C and 2.09 ml/t.d at 70°C. The same trend was observed for CO2 generated as by-product of methanogenesis. The maximum production for CO2 was observed at 80°C, reaching 23467.37 ml/t.d. The differences in CH4 and CO2 production observed for different analyzed samples seem to be related to the composition of the mineral matrix, being observed higher production in samples with higher amount of sulfur. Additionaly, organic layers of the Água de Madeiros and Vale das Fontes Formations (Lusitanian Basin), which are thermally immature and present typically marine kerogen, were also submitted to incubation experiments to evaluate CH4 and CO2 generation. Higher biogenic generation of CH4 with the elevation of temperature was also observed for the Água de Madeiros and Vale das Fontes Formations. This suggests that biogenic CH4 generation is favored by higher temperatures, at least until 80°C, independent of the thermal maturity of the substrate, pointing that the temperature window (and depth zone) for the generation of biogenic CH4 in sedimentary basins is larger than suggested in previous studies.

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Section: Evidências De Geração De Ch4 Biogênico Na Formação Iratiunclassified

Influência da temperatura na geração biogênica de metano e dióxido de carbono na formação Irati, permiano da bacia do Paraná

Almeida¹

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“…O seu conteúdo fossilífero é rico em fósseis répteis Mesosaurus brasilienses (Permiano), que constituiu um elemento crucial na correlação com a África do Sul (Formação Whitehill) e advogar a teoria da deriva continental (Du Toit, 1937). Na sucessão sedimentar, segue-se a Formação Serra Alta, que é constituída por uma sequência de folhelhos e siltitos cinza escuros a pretos maciços pouco ricos em matéria orgânica, entre 0,1 a 0,4 %, com baixo potencial para geração de hidrocarbonetos apesar da sua posição estratigráfica (Teixeira, 2014 . A Formação Serra Alta representaria a última incursão marinha da bacia .…”

Section: Unidades Litoestratigráficas E Sedimentaçãounclassified

História térmica e dinâmica de hidrocarbonetos e fluidos aquosos em folhelhos permianos da Bacia do Paraná

Teixeira¹

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“…The color changes and the presence of trace fossils associated with the Cruziana ichnofacies indicate the return of sedimentation in a very shallow water, under conditions of siliciclastic-dominated environment (Rohn et al 2003. The TOC and hydrogen (H) values from the Serra Alta Formation, vary from minimum and maximum of 0.1 and 3.20%, respectively, indicating a low potential for oil and generation (Teixeira 2014). Stable isotope analyses (δ 13 C) of calcite cement and veins from the Serra Alta shales yielded both negative values (Teixeira 2014) ranging from -8.6 to -2.3‰ (PDB) and from -5.1 to -3.7‰ (PDB), respectively.…”

Section: The Serra Alta Formationmentioning

confidence: 99%

“…The TOC and hydrogen (H) values from the Serra Alta Formation, vary from minimum and maximum of 0.1 and 3.20%, respectively, indicating a low potential for oil and generation (Teixeira 2014). Stable isotope analyses (δ 13 C) of calcite cement and veins from the Serra Alta shales yielded both negative values (Teixeira 2014) ranging from -8.6 to -2.3‰ (PDB) and from -5.1 to -3.7‰ (PDB), respectively. The fluid inclusions data, evidence an homogenization temperature ranging from 55 to 220°C, eutectic temperature (Te) from -57.5 and -49.5°C and ice melting temperatures from -2.5 and 1.0°C indicate a low salinity environment with 0 and 4.2 wt.…”

Section: The Serra Alta Formationmentioning

confidence: 99%

Geocronologia e geoquímica isotópica do Grupo Passa Dois (Permiano) na borda leste da Bacia do Paraná (Estados de Santa Catarina e São Paulo, Brasil)

Alessandretti¹

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The main goals of this thesis are the evaluation of the sedimentary provenance and the birth and growth of carbonate concretions from the Permian Passa Dois Group along the eastern border of the Paraná Basin. To achieve such objectives, detailed columnar sections from the distinct formations of the Passa Dois Group were measured in the Lages Dome, Rio do Rastro and Porangaba areas. The U-Pb and Lu-Hf isotopic signatures of detrital zircons coupled with paleocurrent data from the Serra Alta, Teresina and Rio do Rasto formations, allowed the elaboration of a paleogeographic model for the Paraná Basin and adjacent areas of southwestern Gondwana during the Permian. In this way, the Gondwanides Orogen, which was active during the Permo-Carboniferous, acted as an important source area providing immature detritus to the sediment-routing systems. The Brasiliano/Pan-African mobile belts such as the Ribeira, Dom Feliciano, Damara and Namaqua-Natal, which surrounded the eastern edge of Paraná Basin during Permian times, acted as important sediment source areas. The sedimentary recycling of the Cambrian and Devonian quartzites of the Ventania Fold Belt and the Siluro-Devonian sandstones of the Sierra Grande Formation of the North Patagonian Massif was also a striking process responsible for the sedimentary supply of the Paraná Basin during the Permian. Another significant source area was the Grenvillian igneous rocks of mafic to intermediate compositions from the Namaqua-Natal Belt in South Africa and Namibia. In this way, the sediments that reached the Paraná Basin during the Permian have been subjected to both, short and long distance travels. The stable isotope analyses of micritic calcite cements from carbonate concretions and clastic dikes of the Serra Alta Formation revealed an atypical methane seep system in the Permian Passa Dois Group of the basin. This seep was developed within an epicontinental sea and was fueled by the organic-rich shales of the Irati Formation. The intraplate seismic activity, probably related to the compressional stress along the southern margin of Gondwana, resulted in extensive faulting of Precambrian basement and Permian strata. This syn-sedimentary seismicity induced sediment liquefaction and upward forced injection of fluidized sediments within the Serra Alta sediments. After faulting and clastic dikes emplacement, these structures acted as the plumbing system for methane migration from the Irati organic-rich shales to the Serra Alta Formation. The subtle 13 C-depleted carbonate matrix from the Serra Alta x concretions suggests that the formation was mediated by microbially-induced anaerobic oxidation of methane coupled with sulfate reduction at the sulfate-methane transition zone. Furthermore, microbially-induced sedimentary structures are recorded in limestones between the concretion-bearing intervals. Unusually large pyrite framboid clusters (~1.5 mm) along the concretions rims indicate establishment of strongly reducing conditions, most likely associated to the expansion of an oxygen m...

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Evolução térmica e paleofluídos dos folhelhos da Formação Serra Alta na borda leste da Bacia do Paraná

Cited by 5 publications

References 15 publications

Influência da temperatura na geração biogênica de metano e dióxido de carbono na formação Irati, permiano da bacia do Paraná

Influência da temperatura na geração biogênica de metano e dióxido de carbono na formação Irati, permiano da bacia do Paraná

História térmica e dinâmica de hidrocarbonetos e fluidos aquosos em folhelhos permianos da Bacia do Paraná

Geocronologia e geoquímica isotópica do Grupo Passa Dois (Permiano) na borda leste da Bacia do Paraná (Estados de Santa Catarina e São Paulo, Brasil)

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