Análise de sedimentos associados à atividade de perfuração na plataforma continental externa, Bacia Potiguar - Brasil

This study was developed in an area located on the outer shelf in the Potiguar Basin, Brazilian equatorial margin; this tropical shelf represents a modern, highly dynamic mixed carbonate-siliciclastic system. Field sampling was carried out during 3 cruises surrounding a shallow-water exploratory...

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שמור ב:
מידע ביבליוגרפי
מחבר ראשי: Souza, Claudete Rodrigues de
מחברים אחרים: Vital, Helenice
פורמט: Dissertação
שפה:por
יצא לאור: Universidade Federal do Rio Grande do Norte
נושאים:
Monitoramento
Costa afora
Plataforma externa
Margem equatorial brasileira
CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS: GEODINÂMICA E GEOFÍSICA
גישה מקוונת:https://repositorio.ufrn.br/jspui/handle/123456789/21055
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id ri-123456789-21055
record_format dspace
institution Repositório Institucional
collection RI - UFRN
language por
topic Monitoramento
Costa afora
Plataforma externa
Margem equatorial brasileira
CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS: GEODINÂMICA E GEOFÍSICA
spellingShingle Monitoramento
Costa afora
Plataforma externa
Margem equatorial brasileira
CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS: GEODINÂMICA E GEOFÍSICA
Souza, Claudete Rodrigues de
Análise de sedimentos associados à atividade de perfuração na plataforma continental externa, Bacia Potiguar - Brasil
description This study was developed in an area located on the outer shelf in the Potiguar Basin, Brazilian equatorial margin; this tropical shelf represents a modern, highly dynamic mixed carbonate-siliciclastic system. Field sampling was carried out during 3 cruises surrounding a shallow-water exploratory well to compare sediment properties of the seafloor, including grainsize, texture, mineral composition, carbonate content, and organic matter. Cruise 1 (C1) was carried prior to drilling, while Cruise 2(C2) and 3 (C3) respectivelly 3 and 12 months after drilling. The sample grid used had 16 stations located along 4 radials from 50 m the well up to a distance of 500 m. Sediments were analyzed in the first 0-2 cm, and 0-10 cm layers. The results show that sedimentary cover around the well is poor to very poorly sorted, with the particle size predominantly in the medium to coarse sand fraction, followed by gravel and mud. The content of calcium carbonate is greater than 96%, associated to bioclastic sediments, and the content of organic matter is less than 12%. Only minor sedimentological variations occured in the area affected by drilling operations. Mainly observed during the second cruise, in terms of a change in grain size distribution associated to an increase in siliciclastic content, This impact occurred in the most surficial sediment (0-2 cm), in the radial closest to the well (50 m), and could suggest the effects of drilling. However, in the third cruise, one year after drilling, the sediments return to show the same characteristics as in the first cruise. These results show no significant sedimentological variations due to drilling activity, and indicate that ocean dynamics in this area was high enough to recover the environment original characteristics.
author2 Vital, Helenice
author_facet Vital, Helenice
Souza, Claudete Rodrigues de
format masterThesis
author Souza, Claudete Rodrigues de
author_sort Souza, Claudete Rodrigues de
title Análise de sedimentos associados à atividade de perfuração na plataforma continental externa, Bacia Potiguar - Brasil
title_short Análise de sedimentos associados à atividade de perfuração na plataforma continental externa, Bacia Potiguar - Brasil
title_full Análise de sedimentos associados à atividade de perfuração na plataforma continental externa, Bacia Potiguar - Brasil
title_fullStr Análise de sedimentos associados à atividade de perfuração na plataforma continental externa, Bacia Potiguar - Brasil
title_full_unstemmed Análise de sedimentos associados à atividade de perfuração na plataforma continental externa, Bacia Potiguar - Brasil
title_sort análise de sedimentos associados à atividade de perfuração na plataforma continental externa, bacia potiguar - brasil
publisher Universidade Federal do Rio Grande do Norte
publishDate 2016
url https://repositorio.ufrn.br/jspui/handle/123456789/21055
work_keys_str_mv AT souzaclaudeterodriguesde analisedesedimentosassociadosaatividadedeperfuracaonaplataformacontinentalexternabaciapotiguarbrasil
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spelling ri-123456789-210552017-11-03T15:05:19Z Análise de sedimentos associados à atividade de perfuração na plataforma continental externa, Bacia Potiguar - Brasil Souza, Claudete Rodrigues de Vital, Helenice Lima, Zuleide Maria Carvalho Corrêa, Iran Carlos Stalliviere Monitoramento Costa afora Plataforma externa Margem equatorial brasileira CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS: GEODINÂMICA E GEOFÍSICA This study was developed in an area located on the outer shelf in the Potiguar Basin, Brazilian equatorial margin; this tropical shelf represents a modern, highly dynamic mixed carbonate-siliciclastic system. Field sampling was carried out during 3 cruises surrounding a shallow-water exploratory well to compare sediment properties of the seafloor, including grainsize, texture, mineral composition, carbonate content, and organic matter. Cruise 1 (C1) was carried prior to drilling, while Cruise 2(C2) and 3 (C3) respectivelly 3 and 12 months after drilling. The sample grid used had 16 stations located along 4 radials from 50 m the well up to a distance of 500 m. Sediments were analyzed in the first 0-2 cm, and 0-10 cm layers. The results show that sedimentary cover around the well is poor to very poorly sorted, with the particle size predominantly in the medium to coarse sand fraction, followed by gravel and mud. The content of calcium carbonate is greater than 96%, associated to bioclastic sediments, and the content of organic matter is less than 12%. Only minor sedimentological variations occured in the area affected by drilling operations. Mainly observed during the second cruise, in terms of a change in grain size distribution associated to an increase in siliciclastic content, This impact occurred in the most surficial sediment (0-2 cm), in the radial closest to the well (50 m), and could suggest the effects of drilling. However, in the third cruise, one year after drilling, the sediments return to show the same characteristics as in the first cruise. These results show no significant sedimentological variations due to drilling activity, and indicate that ocean dynamics in this area was high enough to recover the environment original characteristics. Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Este estudo foi desenvolvido em uma área localizada na plataforma externa da Bacia Potiguar, margem equatorial brasileira. A amostragem de sedimentos foi realizada em três campanhas, em torno de um poço exploratório, para comparar as propriedades dos sedimentos do fundo marinho, incluindo granulometria, composição, conteúdo de carbonato e matéria orgânica, anterior a perfuração do poço, com amostras coletadas 3 e 12 meses após a perfuração. O planejamento amostral utilizou 16 estações localizadas em 4 radiais distantes 50 m, 100 m, 250 m e 500 m do poço. Os sedimentos foram analisados nas camadas 0-2 cm e 0-10 cm. Os resultados mostraram que a cobertura sedimentar em torno do poço era pobre a muito pobremente selecionada, com granulometria predominante na fração areia grossa com granulo e cascalho, seguida por cascalho e lama. O conteúdo de carbonato de cálcio foi maior que 96%, associado a sedimentos biocláticos, e o conteúdo de matéria orgânica foi menor que 12%. Apenas pequenas variações sedimentológicas ocorreram na área afetada pelas operações de perfuração. A principal diferença foi observada em amostras da segunda campanha, em termos de uma mudança na distribuição granulométrica associada a um aumento no conteúdo de sedimentos siliciclásticos. Este impacto ocorreu nos sedimentos mais superficias (0-2 cm), no raio mais próximo ao poço (50 m), e poderia sugerir o efeito da perfuração. Entretanto, os sedimentos coletados na campanha 3, um ano após a perfuração, voltaram a apresentar as mesmas características da primeira campanha. Estes resultados indicam que não houve variações sedimentológicas significantes devido a atividade de perfuração, e que a dinâmica oceânica na área de estudo foi forte o suficiente para recuperar as características originais do ambiente. ABSTRACT This study was developed in an area located on the outer shelf in the Potiguar Basin, Brazilian equatorial margin; this tropical shelf represents a modern, highly dynamic mixed carbonate-siliciclastic system. Field sampling was carried out during 3 cruises surrounding a shallow-water exploratory well to compare sediment properties of the seafloor, including grain-size, texture, mineral composition, carbonate content, and organic matter, prior to drilling with samples obtained 3 and 12 months after drilling. The sample grid used had 16 stations located along 4 radials from 50 m the well up to a distance of 500 m. Sediments were analyzed in the first 0-2 cm, and 0-10 cm layers. The results show that sedimentary cover around the well is poor to very poorly sorted, with the particle size predominantly in the medium to coarse sand fraction, followed by gravel and mud. The content of calcium carbonate is greater than 96%, associated to bioclastic sediments, and the content of organic matter is less than 12%. Only minor sedimentological variations occured ­in the area affected by drilling operations. The most noticeable effects were observed during the second cruise, in terms of a change in grain size distribution associated to an increase in siliciclastic content, This impact occurred in the most surficial sediment (0-2 cm), in the radial closest to the well (50 m), and could suggest the effects of drilling. However, in the third cruise, one year after drilling, the sediments return to show the same characteristics as in the first cruise. These results show no significant sedimentological variations due to drilling activity, and indicate that ocean dynamics in this area was high enough to recover the environment original characteristics. 2016-07-28T22:35:34Z 2016-07-28T22:35:34Z 2014-04-03 masterThesis SOUZA, Claudete Rodrigues de. Análise de sedimentos associados à atividade de perfuração na plataforma continental externa, Bacia Potiguar - Brasil. 2014. 31f. Dissertação (Mestrado em Geodinâmica e Geofísica) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2014. https://repositorio.ufrn.br/jspui/handle/123456789/21055 por Acesso Aberto application/pdf Universidade Federal do Rio Grande do Norte Brasil UFRN PROGRAMA DE PÓS-GRADUAÇÃO EM GEODINÂMICA E GEOFÍSICA

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