Diagénesis y estratigrafía secuencial de la arenisca «U» de la Fm Napo del Oriente, Ecuador

The Napo Formation of Cretaceous age in the Oriente basin, Ecuador, is an important sandstone reservoir. The «U» sandstone is one oil interval within the Napo Formation. It is buried at a depth of 1500 m in the eastern part of the basin and down to 3100 m in the western part. This sandstone display...

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Detalhes bibliográficos
Autores: Estupiñán Letamendi, Jenny, Marfil Pérez, Rafaela, Permanyer, Albert
Formato: artículo
Fecha de publicación:2006
País:España
Recursos:Universidad de Huelva (UHU)
Repositorio:Arias Montano. Repositorio Institucional de la Universidad de Huelva
Idioma:español
OAI Identifier:oai:ariasmontano.uhu.es:10272/8595
Acesso em linha:http://hdl.handle.net/10272/8595
Access Level:acceso abierto
Palavra-chave:Diagenesis
Carbonate cement
Sequence stratigraphy
Oriente Basin
Ecuador
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spelling Diagénesis y estratigrafía secuencial de la arenisca «U» de la Fm Napo del Oriente, EcuadorDiagenesis and sequence stratigraphy of the &quotU&quotsandstone from the Napo Formation, Oriente basin, EcuadorEstupiñán Letamendi, JennyMarfil Pérez, RafaelaPermanyer, AlbertDiagenesisCarbonate cementSequence stratigraphyOriente BasinEcuadorThe Napo Formation of Cretaceous age in the Oriente basin, Ecuador, is an important sandstone reservoir. The «U» sandstone is one oil interval within the Napo Formation. It is buried at a depth of 1500 m in the eastern part of the basin and down to 3100 m in the western part. This sandstone display higher porosity values (av. 20%) than other reservoirs in the region. The sandstone was deposited in fluvial, transitional and marine environments, and their correlation with the sequence stratigraphy is related to HST, LST, TS. «U» sandstone is fine to medium grained quartzarenite and subordinate subarkose. The principal cements are carbonates, quartz overgrowth and kaolin, with scarce amounts of pyrite and chlorite. Carbonate cements include: Eogenetic siderite (S1), mesogenetic and post-compactional calcite, Fe-dolomite, ankerite and siderite (S2). Early siderite helped to retain porosity by supporting the sandstone framework against compaction. Dissolution of feldspars and mesogenetic carbonate cements is the main mechanism for secondary porosity development during mesodiagenesis. The stable isotope composition of the S1 siderite are consistent with precipitation from meteoric waters. The anomalous low ä18O‰ values of some of these carbonate phases could reflect the replacement and recristalization from S1 to S2 siderite at deep burial and high temperature. However, due to this higher Mg content, siderite S2 could have precipitated as a result of the thermal descarboxilation of the Mg rich organic matter. The last carbonate cements to precipitate were dolomite/ankerite. The negative ä18O‰ in these cements is related to the continued precipitation at higher temperature and burial depth20062006-01-0120062006-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10272/8595reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelvainstname:Universidad de Huelva (UHU)Españolspaopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:ariasmontano.uhu.es:10272/85952026-06-02T14:58:11Z
dc.title.none.fl_str_mv Diagénesis y estratigrafía secuencial de la arenisca «U» de la Fm Napo del Oriente, Ecuador
Diagenesis and sequence stratigraphy of the &quot
U&quot
sandstone from the Napo Formation, Oriente basin, Ecuador
title Diagénesis y estratigrafía secuencial de la arenisca «U» de la Fm Napo del Oriente, Ecuador
spellingShingle Diagénesis y estratigrafía secuencial de la arenisca «U» de la Fm Napo del Oriente, Ecuador
Estupiñán Letamendi, Jenny
Diagenesis
Carbonate cement
Sequence stratigraphy
Oriente Basin
Ecuador
title_short Diagénesis y estratigrafía secuencial de la arenisca «U» de la Fm Napo del Oriente, Ecuador
title_full Diagénesis y estratigrafía secuencial de la arenisca «U» de la Fm Napo del Oriente, Ecuador
title_fullStr Diagénesis y estratigrafía secuencial de la arenisca «U» de la Fm Napo del Oriente, Ecuador
title_full_unstemmed Diagénesis y estratigrafía secuencial de la arenisca «U» de la Fm Napo del Oriente, Ecuador
title_sort Diagénesis y estratigrafía secuencial de la arenisca «U» de la Fm Napo del Oriente, Ecuador
dc.creator.none.fl_str_mv Estupiñán Letamendi, Jenny
Marfil Pérez, Rafaela
Permanyer, Albert
author Estupiñán Letamendi, Jenny
author_facet Estupiñán Letamendi, Jenny
Marfil Pérez, Rafaela
Permanyer, Albert
author_role author
author2 Marfil Pérez, Rafaela
Permanyer, Albert
author2_role author
author
dc.contributor.none.fl_str_mv
dc.subject.none.fl_str_mv Diagenesis
Carbonate cement
Sequence stratigraphy
Oriente Basin
Ecuador
topic Diagenesis
Carbonate cement
Sequence stratigraphy
Oriente Basin
Ecuador
description The Napo Formation of Cretaceous age in the Oriente basin, Ecuador, is an important sandstone reservoir. The «U» sandstone is one oil interval within the Napo Formation. It is buried at a depth of 1500 m in the eastern part of the basin and down to 3100 m in the western part. This sandstone display higher porosity values (av. 20%) than other reservoirs in the region. The sandstone was deposited in fluvial, transitional and marine environments, and their correlation with the sequence stratigraphy is related to HST, LST, TS. «U» sandstone is fine to medium grained quartzarenite and subordinate subarkose. The principal cements are carbonates, quartz overgrowth and kaolin, with scarce amounts of pyrite and chlorite. Carbonate cements include: Eogenetic siderite (S1), mesogenetic and post-compactional calcite, Fe-dolomite, ankerite and siderite (S2). Early siderite helped to retain porosity by supporting the sandstone framework against compaction. Dissolution of feldspars and mesogenetic carbonate cements is the main mechanism for secondary porosity development during mesodiagenesis. The stable isotope composition of the S1 siderite are consistent with precipitation from meteoric waters. The anomalous low ä18O‰ values of some of these carbonate phases could reflect the replacement and recristalization from S1 to S2 siderite at deep burial and high temperature. However, due to this higher Mg content, siderite S2 could have precipitated as a result of the thermal descarboxilation of the Mg rich organic matter. The last carbonate cements to precipitate were dolomite/ankerite. The negative ä18O‰ in these cements is related to the continued precipitation at higher temperature and burial depth
publishDate 2006
dc.date.none.fl_str_mv 2006
2006-01-01
2006
2006-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10272/8595
url http://hdl.handle.net/10272/8595
dc.language.none.fl_str_mv Español
spa
language_invalid_str_mv Español
language spa
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelva
instname:Universidad de Huelva (UHU)
instname_str Universidad de Huelva (UHU)
reponame_str Arias Montano. Repositorio Institucional de la Universidad de Huelva
collection Arias Montano. Repositorio Institucional de la Universidad de Huelva
repository.name.fl_str_mv
repository.mail.fl_str_mv
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