Padrões diagenéticos em arenitos de sistemas de Sabk ha costeiros-eólicos: um estudo comparativo dos reservatórios Juruá da área de Urucu, Bacia de Solimões, AM

Coastal-eolian sabkha sandstones from different ages and basins show similar diagenetic patterns, which understanding is important for their evaluation as geochemical systems and as hydrocarbon reservoirs. The Carboniferous sandstones of the Juruá Formation (Solimões Basin) are one of the most impor...

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Autores: Elias, Andreia Regina Dias, De Ros, Luiz Fernando, Mizusaki, Ana Maria Pimentel
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2004
País:Brasil
Recursos:Universidade Federal do Rio Grande do Sul (UFRGS)
Repositório:Repositório Institucional da UFRGS
Idioma:português
OAI Identifier:oai:www.lume.ufrgs.br:10183/22615
Acesso em linha:http://hdl.handle.net/10183/22615
Access Level:Acceso aberto
Palavra-chave:Diagenese de arenitos
Solimões, Bacia sedimentar do (AM)
Diagenesis
Coastal-eolian sabkha sandstones
Paragenetic evolution
Solimões Basin
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spelling 2010-05-20T04:16:22Z20041518-2398http://hdl.handle.net/10183/22615000442815Coastal-eolian sabkha sandstones from different ages and basins show similar diagenetic patterns, which understanding is important for their evaluation as geochemical systems and as hydrocarbon reservoirs. The Carboniferous sandstones of the Juruá Formation (Solimões Basin) are one of the most important gas reservoirs of Brazil. The sandstones and interbedded mudrocks, evaporites and dolostones were deposited within a coastal sabkha environment with pervasive eolian reworking, under increasing marine influence, and hot and dry climate. Four stacked drying/wetting upward cycles were identified, with sabkha facies in the base overlain by eolian deposits, followed again by sabkha deposits, commonly eroded by the next cycle. Eolian dune and sandsheet sandstones are the best reservoirs. The diagenetic evolution and the relationships among diagenesis, depositional facies and stratigraphic unit boundaries show similarities with other coastal-eolian sabkha sandstones. The eodiagenesis is characterized by mechanical compaction, hematite and infiltrated clay coatings, framboidal pyrite, microcrystalline and blocky dolomite. Mesodiagenesis comprises chemical compaction, K-feldspar and quartz overgrowths, poikilotopic anhydrite, feldspar dissolution and albitization, illite and chlorite authigenesis, and late quartz, Fedolomite/ ankerite, calcite and siderite. Localized telogenetic effects include oxidation of ferroan constituents and kaolinite precipitation. Blocky dolomite and quartz cementation, and chemical compaction through intergranular and stylolitic pressure dissolution are more abundant in the non-eolian sandstones. Microcrystalline pore-filling and pore-lining dolomite, and patchy, poikilotopic, post-compactional anhydrite cementation, mostly close to the contacts with interbedded evaporites, are more abundant in the eolian sandstones. These diagenetic patterns are similar to those of the Rotliegend Group in northern Germany and in the North Sea, of the Norphlet and Tensleep Formations in USA, of the Muschelkalk Formation in Spain, and of the Monte Alegre Formation from the Amazonas Basin, northern Brazil. The similarities among the diagenetic histories of these coastal-eolian sabkha sandstones are ascribed to their similar patterns of stratigraphic organization (intercalated evaporite and carbonate beds) and of composition and circulation of pore fluids.application/pdfporPesquisas em Geociências. Porto Alegre, RS. Vol. 31, n. 1 (2004), p. 51-70Diagenese de arenitosSolimões, Bacia sedimentar do (AM)DiagenesisCoastal-eolian sabkha sandstonesParagenetic evolutionSolimões BasinPadrões diagenéticos em arenitos de sistemas de Sabk ha costeiros-eólicos: um estudo comparativo dos reservatórios Juruá da área de Urucu, Bacia de Solimões, AMinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSElias, Andreia Regina DiasDe Ros, Luiz FernandoMizusaki, Ana Maria PimentelTEXT000442815.pdf.txt000442815.pdf.txtExtracted Texttext/plain62251http://www.lume.ufrgs.br/bitstream/10183/22615/2/000442815.pdf.txtc0bc9ca12ef6210c0524f438ad6d7fb9MD52ORIGINAL000442815.pdf000442815.pdfTexto completoapplication/pdf581339http://www.lume.ufrgs.br/bitstream/10183/22615/1/000442815.pdf1fcd64eee2f7a9de0b0adf747a7c27caMD51THUMBNAIL000442815.pdf.jpg000442815.pdf.jpgGenerated Thumbnailimage/jpeg1573http://www.lume.ufrgs.br/bitstream/10183/22615/3/000442815.pdf.jpg700a3db6c413554908c51ad5eb6e097aMD5310183/226152021-12-20 05:31:54.316929oai:www.lume.ufrgs.br:10183/22615Repositório InstitucionalPUBhttps://lume.ufrgs.br/oai/requestlume@ufrgs.bropendoar:2021-12-20T07:31:54Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Padrões diagenéticos em arenitos de sistemas de Sabk ha costeiros-eólicos: um estudo comparativo dos reservatórios Juruá da área de Urucu, Bacia de Solimões, AM
title Padrões diagenéticos em arenitos de sistemas de Sabk ha costeiros-eólicos: um estudo comparativo dos reservatórios Juruá da área de Urucu, Bacia de Solimões, AM
spellingShingle Padrões diagenéticos em arenitos de sistemas de Sabk ha costeiros-eólicos: um estudo comparativo dos reservatórios Juruá da área de Urucu, Bacia de Solimões, AM
Elias, Andreia Regina Dias
Diagenese de arenitos
Solimões, Bacia sedimentar do (AM)
Diagenesis
Coastal-eolian sabkha sandstones
Paragenetic evolution
Solimões Basin
title_short Padrões diagenéticos em arenitos de sistemas de Sabk ha costeiros-eólicos: um estudo comparativo dos reservatórios Juruá da área de Urucu, Bacia de Solimões, AM
title_full Padrões diagenéticos em arenitos de sistemas de Sabk ha costeiros-eólicos: um estudo comparativo dos reservatórios Juruá da área de Urucu, Bacia de Solimões, AM
title_fullStr Padrões diagenéticos em arenitos de sistemas de Sabk ha costeiros-eólicos: um estudo comparativo dos reservatórios Juruá da área de Urucu, Bacia de Solimões, AM
title_full_unstemmed Padrões diagenéticos em arenitos de sistemas de Sabk ha costeiros-eólicos: um estudo comparativo dos reservatórios Juruá da área de Urucu, Bacia de Solimões, AM
title_sort Padrões diagenéticos em arenitos de sistemas de Sabk ha costeiros-eólicos: um estudo comparativo dos reservatórios Juruá da área de Urucu, Bacia de Solimões, AM
dc.creator.none.fl_str_mv Elias, Andreia Regina Dias
De Ros, Luiz Fernando
Mizusaki, Ana Maria Pimentel
author Elias, Andreia Regina Dias
author_facet Elias, Andreia Regina Dias
De Ros, Luiz Fernando
Mizusaki, Ana Maria Pimentel
author_role author
author2 De Ros, Luiz Fernando
Mizusaki, Ana Maria Pimentel
author2_role author
author
dc.subject.por.fl_str_mv Diagenese de arenitos
Solimões, Bacia sedimentar do (AM)
topic Diagenese de arenitos
Solimões, Bacia sedimentar do (AM)
Diagenesis
Coastal-eolian sabkha sandstones
Paragenetic evolution
Solimões Basin
dc.subject.eng.fl_str_mv Diagenesis
Coastal-eolian sabkha sandstones
Paragenetic evolution
Solimões Basin
description Coastal-eolian sabkha sandstones from different ages and basins show similar diagenetic patterns, which understanding is important for their evaluation as geochemical systems and as hydrocarbon reservoirs. The Carboniferous sandstones of the Juruá Formation (Solimões Basin) are one of the most important gas reservoirs of Brazil. The sandstones and interbedded mudrocks, evaporites and dolostones were deposited within a coastal sabkha environment with pervasive eolian reworking, under increasing marine influence, and hot and dry climate. Four stacked drying/wetting upward cycles were identified, with sabkha facies in the base overlain by eolian deposits, followed again by sabkha deposits, commonly eroded by the next cycle. Eolian dune and sandsheet sandstones are the best reservoirs. The diagenetic evolution and the relationships among diagenesis, depositional facies and stratigraphic unit boundaries show similarities with other coastal-eolian sabkha sandstones. The eodiagenesis is characterized by mechanical compaction, hematite and infiltrated clay coatings, framboidal pyrite, microcrystalline and blocky dolomite. Mesodiagenesis comprises chemical compaction, K-feldspar and quartz overgrowths, poikilotopic anhydrite, feldspar dissolution and albitization, illite and chlorite authigenesis, and late quartz, Fedolomite/ ankerite, calcite and siderite. Localized telogenetic effects include oxidation of ferroan constituents and kaolinite precipitation. Blocky dolomite and quartz cementation, and chemical compaction through intergranular and stylolitic pressure dissolution are more abundant in the non-eolian sandstones. Microcrystalline pore-filling and pore-lining dolomite, and patchy, poikilotopic, post-compactional anhydrite cementation, mostly close to the contacts with interbedded evaporites, are more abundant in the eolian sandstones. These diagenetic patterns are similar to those of the Rotliegend Group in northern Germany and in the North Sea, of the Norphlet and Tensleep Formations in USA, of the Muschelkalk Formation in Spain, and of the Monte Alegre Formation from the Amazonas Basin, northern Brazil. The similarities among the diagenetic histories of these coastal-eolian sabkha sandstones are ascribed to their similar patterns of stratigraphic organization (intercalated evaporite and carbonate beds) and of composition and circulation of pore fluids.
publishDate 2004
dc.date.issued.fl_str_mv 2004
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dc.relation.ispartof.pt_BR.fl_str_mv Pesquisas em Geociências. Porto Alegre, RS. Vol. 31, n. 1 (2004), p. 51-70
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