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Dieta de duas esp?cies de peixes da fam?lia Cichlidae (Actinopterygii ? Perciformes) na regi?o do aproveitamento el?trico de estreito: Rio Tocantins, MaReis, Luis Rog?rio Godinho dos 04 February 2013 (has links)
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Previous issue date: 2013-02-04 / The inclusion of artificial barriers in freshwater ecosystems can trigger ecological, economic and social processes, affecting them. The food plasticity is an adaptive feature to the new environment, it is expected that the food of fish species under modified atmospheres follows changes in nutrient availability in the environment. To evaluate whether among the different phases of construction of Estreito barrage, Tocantins River, MA there are differences in the dietary habits of the family Cichlidae, collecting expeditions were conducted from November 2009 to 2010, (river stage) and November 2010 to April 2011 (filling phase), with an average duration of 10 days per year. The food items of dominant cichlid were analyzed using frequency and volume index, combined in Alimentary Index(IAI). The Shannon index was used to evaluate the diversity of items and classification of trophic guild. Significant differences in amplitude niche between the river and filler phases were verified by testing Hutcheson. Among cichlids found in fishes and alga influences barrage area, Geophagus proximus and Cichla proximus piquiti were dominant, being examined 26 specimens of Geophagus proximus in river stage and 6 specimens in filling stage, with results suggesting an omnivorous diet, predominantly f item in river stage and insects item for filling phase. The Cichla piquiti were examined 28 specimens in river stage and 32 specimens during stage filling, suggesting a piscivorous diet in both phases of the barrage. The number of food categories ranged between 09, during river phase and 08 the filling phase to Ciclha piquiti and between 14 during river phase and 12 the filling phase to Geophagus proximus. The test of difference in niche amplitude between the two phases revealed a nonsignificant difference for Cichla piquiti and significant for Geophagus proximus. It is concluded that the change in the hydrological regime caused by different stages in construction of the Estreito barrage (river and filling) led to changes in dietary habits in only one of two species of fish of the Cichlidae family in the region. Cichla piquiti presented itself more specialized as to its feed, preserving the two phases of the barrage piscivorous habit as that Geophagus proximus proved to have a greater trophic plasticity, having a greater amount of food items and diversifying them, in the two phases of the barrage, but not diversifying its trophic guild. / A inclus?o de barreiras artificiais em ecossistemas aqu?ticos continentais pode desencadear processos com repercuss?es ecol?gicas, econ?micas e sociais. A plasticidade alimentar ? uma caracter?stica ? adapta??o ao novo ambiente, esperando-se que a alimenta??o de esp?cies de peixes em ambientes modificados acompanhe as mudan?as na disponibilidade de nutrientes do ambiente. Para avaliar se entre as diferentes fases de constru??o da Barragem de Estreito, Rio Tocantins, MA houve diferen?as no h?bito alimentar em duas esp?cies de peixes (Geophagus proximus e Cichla piquiti) da fam?lia Cichlidae, expedi??es de coleta foram realizadas de novembro de 2009 a 2010, (fase rio) e novembro de 2010 a abril 2011(fase enchimento), com dura??o m?dia de 10 dias por campanha. Os itens alimentares de cicl?deos dominantes foram analisados pelo m?todo de freq??ncia de ocorr?ncia e ?ndice volum?trico, combinados no ?ndice de Import?ncia Alimentar (IAI). O ?ndice de Shannon foi usado para avalia??o da diversidade de itens e classifica??o de guilda tr?fica. As diferen?as significativas na amplitude de nicho entre as fases rio e enchimento foram verificadas atrav?s do teste de Hutcheson. Entre os Cicl?deos encontrados na ?rea de influ?ncia da Barragem, Geophagus proximus e Cichla piquiti foram dominantes, com os resultados sugerindo uma dieta on?vora, com predomin?ncia de peixes e algas para a fase rio e de insetos para a fase enchimento. O n?mero de categorias alimentares variou entre 09 na fase rio e 08 na fase enchimento para Ciclha piquiti e entre 14 na fase rio e 12 na fase enchimento para Geophagus proximus. O teste de diferen?a de amplitude de nicho entre as duas fases revelou uma diferen?a n?o significativa para Cichla piquiti e significativa para Geophagus proximus. Conclui-se neste trabalho que a mudan?a no regime hidrol?gico causado pelas diferentes fases de constru??o da Barragem de Estreito (rio e enchimento) causou modifica??es nos h?bitos alimentares das duas esp?cies de peixes da fam?lia Cichlidae da regi?o. Cichla Piquiti revelou-se mais conservativa quanto a sua alimenta??o, apresentando poucas modifica??es em sua dieta nas duas fases da barragem enquanto Geophagus proximus revelou ter uma maior plasticidade tr?fica, tendo uma maior quantidade de itens alimentares e com varia??es nos itens dominantes entre as duas fases da barragem, por?m n?o variando sua guilda tr?fica.
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Geoprocessamento aplicado ? identifica??o, an?lise espacial e temporal de usos da terra em ?reas adjacentes ?s turfeiras da serra do espinha?o meridional / Geoprocessing applied to identification, spatial and temporal analysis of land use in peat bogs neighboring ?reas of the Southern Espinha?oFonseca, Samuel Ferreira da January 2016 (has links)
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Previous issue date: 2016 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Turfeiras s?o produto da lenta decomposi??o de vegetais em ambientes saturados com ?gua. S?o ecossistemas particulares por acumularem grandes volumes de ?gua e mat?ria org?nica e atuam como registros cronol?gicos de mudan?as clim?ticas e ambientais. O objetivo deste trabalho foi: cartografar ?reas adjacentes ? turfeiras da Serra do Espinha?o Meridional ? SdEM cronologicamente (1964 ? 2014), para identificar e quantificar atividades antr?picas nos ?ltimos 50 anos, por meio de t?cnicas do geoprocessamento. Foram utilizadas fotografias a?reas de 1964 (1:60.000), e de 1979 (1:25.000). Tamb?m foram utilizadas imagens orbitais, dos sat?lites Landsat TM/5 dos anos 1984, 1995 e 2005, Landsat OLI/8 de 2014 e RapdEye de 2011. As cartas topogr?ficas do IBGE (1:100.000) formaram a base cartogr?fica. Todos os dados foram processados nas seguintes plataformas: Google earth? pro, ArcGIS? 9.3., ENVI? 4.5 e Quantum GIS? 2.10. O geoprocessamento ocorreu suportado pelas seguintes t?cnicas: georreferenciamento, mosaicagem, classifica??o supervisionada (MaxVer) e vetoriza??o. Os dados gerados foram utilizados para identifica??o dos tipos de atividades do uso da terra, como pastagem, eucalipto e outras culturas. A atividade agr?cola mais intensa nas ?reas adjacentes ?s turfeiras foi o cultivo de eucalipto, que n?o era cultivado em 1964, mas em 2014 ocupou 341,37 ha (2,07%). Outras culturas (milho, caf? e morango), que n?o eram cultivadas nas adjac?ncias das turfeiras em 1964, passaram a ocupar 312,46 ha (1,90%) em 2014. A ?rea ocupada com pastagens passou de 378,57 ha em 1964 para 1.176,40 ha em 2014, o que corresponde a um avan?o de 2,30 para 7,14% da ?rea adjacente total. As ?reas adjacentes ?s turfeiras n?o eram utilizadas de forma sistem?tica at? 1995. O avan?o das atividades antr?picas nas ?reas adjacentes ?s turfeiras nas ?ltimas d?cadas foi substancial. A decad?ncia da minera??o de diamante na regi?o de Diamantina coincide com a intensifica??o do uso da terra. Este cen?rio sinaliza a necessidade de cria??o de mecanismos legais para prote??o desses ecossistemas. Al?m disso, ? necess?rio estabelecer diretrizes para o planejamento da ocupa??o das ?reas no entorno das turfeiras da SdEM. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2016. / ABSTRACT Peat bogs are outcome of slow plant decomposition in environments saturated by water. Theyare particular ecosystems that accumulate large amounts of water and organic matter and act as chronological records of climatic and environmental changes. This study aims to map peat bogs adjacent ?reas of the Southern Espinha?o - SdE chronologically (1964 - 2014), to identify and quantify anthropic activities over the past 50 years, through geoprocessing techniques. Aerial photographs from 1964 were used (1: 60,000) and 1979 (1: 25,000). Space-based images were also used Satellite Landsat TM/5 years 1984, 1995 and 2005, Landsat OLI/8 RapidEye 2014 and 2011. IBGE topographic maps (1:100,000) made up the
cartographic base. All data were processed on platforms: Google earth ? pro, ArcGIS ? 9.3, 4.5 and ENVI ? Quantum GIS? 2.10. Geoprocessing was supported by these techniques: georeferencing, mosaicing, supervised classification (MaxVer) and vectorization. Data generated were used to identify types of land use activities such as grazing, eucalyptus and other crops. The most intense agricultural activity in adjacent ?reas to peat bogs was eucalyptus cultivation, which was not cultivated in 1964, but in 2014, it held 341.37 ha (2.07%). Other crops (corn, coffee and strawberry), which were not cultivated in peat lands vicinity in 1964, came to occupy 312.46 ha (1.90%) in 2014. The ?rea occupied by pastures increased from 378.57 ha in 1964 to 1176.40 ha in 2014, which corresponds to an advance of 2.30 to 7.14% of the total adjacent ?rea. Adjacent ?reas to peat bogs were not used systematically until 1995. Human activities advance in adjacent ?reas to peat bogs in recent
decades has been extensive. Diamond mining decay in Diamantina region coincides with the intensification of land use. This scenario shows the necessity to establish legal mechanisms to protect these ecosystems. Moreover, it is necessary to establish guidelines for planning o ?reas occupation surrounding the Southern Espinha?o peat bogs.
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Evolu??o tectono-estrutural do Campo de Xar?u (Sub-bacia de Munda?, Bacia do Cear? - NE do Brasil: abordagem multiescala e pluriferramentalAntunes, Alex Francisco 26 July 2004 (has links)
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Previous issue date: 2004-07-26 / The Xar?u Oil Field, located in the center-southern portion of the Munda? Sub-Basin (eastern portion of the Cear? Basin), is characterized by a main Iramework of NW-trending and NE-dipping faults. The faults in the Xar?u Oil Field, among which the Xar?u Fautt stands out, are arranged according to an extensional-listriclan, rooted on a detachment surface corresponding to the Munda? Fault, the border fautt of Munda? Sub-Basin. During the tectonic-structural evolution of the Xar?u Oil Field and the Munda? Sub-Basin, the Munda? Fault played a crucial role on the control of the geometry of both compartments. The main carbonatic unit in the Xar?u Oil Field, named the Trair? Member(Paracuru Formation of Late Aptian to Early Albian age), contains the largest oil volume in the field, concentrated in structurally-controlled accumulations. The Trair? Member is composed by a variety of carbonatic rocks (massive, bedded or laminated calcilutites, ostracodites, calcarenites and carbonatic rudites, all of them presenting variable degrees of dolomitization). The carbonatic rocks are interbedded into thick packages of black shales and marls, besides local beds of siliciclastic conglomerates, sandstones, siltnes and argillites. From the spatial association and the genetic relationships between the carbonatic and siliciclastic units, it is possible to group them in three lithofacies associations (Marginal Plain, Ramp and Lacustrine Interior) that, together, were developed in a lacustrine system associated to a marginal sabkha. Structural studies based on drill coresthat sample the Trair? Member in the Xar?u Oil Field allowed to characterize two generations of meso- to microscale structures: the D1 group presents a typical hydroplastic character, being characterized by intra/interstratal to oblique-bedding shear zones. The hydroplastic character related to these structures allowed to infer their development at an early-lithilication stage of the Trair? Member, leading to infer an Early Cretaceous age to them. The second group of structures identified in the drill cores, nominated D2 and ascribed to a Neogene age, presents a strictly brttle character, being typilied by normal faults and slickenfibers of re-crystallized clayminerals, ali olthem displaying variable orientations. Although the present faults in the Xar?u Oil Field (and, consequently, in the Munda? Sub-Basin) were classically relerred as struetures of essentially normal displacement, the kinematics analysis of the meso-to microscaie D1 struetures in the drill cores led to deline oblique displacements (normal with a clockwise strike-slip component) to these faults, indicating a main tectonic transport to ENE. These oblique movements would be responsible for the installation of a transtensive context in the Munda? Sub-Basin, as part of the transcurrent to translormant opening of the Atlantic Equatorial Margin. The balancing of four struetural cross-sections ofthe Xar?u Oil Field indicates that the Munda? Fault was responsible for more than 50% of the total stretching (? factor) registered during the Early Aptian. At the initial stages of the "rifting", during Early Aptianuntil the Holocene, the Munda? Sub-Basin (and consequently the Xar?u Oil Fleld) accumulated a total stretching between 1.21 and 1.23; in other words, the crust in this segment of the Atlantic Equatorial Margin was subjeeted to an elongation of about 20%. From estimates of oblique displacements related to the faults, it ws possible to construct diagrams that allow the determination of stretching factors related to these displacements. Using these diagrams and assuming the sense 01 dominant teetonictransport towards ENE, it was possible to calculate the real stretching lactors related to the oblique movement 0 of the faults in the Munda? Sub-Basin. which reached actual values between 1.28 and 1.42. ln addnion to the tectonic-structural studies in the Xar?u Oil Field, the interpretation of remote sensing products, coupled wnh characterization of terrain analogues in seleeted areas along the northern Cear? State (continental margins of the Cear? and Potiguar basins), provided addnional data and constraints about the teetonic-structural evolution of the oil lield. The work at the analogue sites was particularly effective in the recognition and mapping, in semidetail scale, several generations of struetures originated under a brittle regime. Ali the obtained information (from the Xar?u Oil Field, the remote sensor data and the terrain analogues) were jointly interpreted, culminating with the proposnion of an evolutionary model lor this segment of the Atlantic Equatorial Margin; this model that can be applied to the whole Margin, as well. This segmentof the Atlantic Equatorial Margin was delormedin an early E-W (when considered lhe present-day position of the South American Plate) transcurrent to transform regime with dextral kinematics, started Irom, at least, the Early Aptian, which left its record in several outcrops along the continental margin of the Cear? State and specilically in the Xar?u off Field. The continuous operation of the regime, through the Albian and later periods, led to the definitive separation between the South American and African plates, with the formation of oceanic lithosphere between the two continental blocks, due to the emplacement off spreading centers. This process involved the subsequent transition of the transcurrent to a translorm dextral regime, creating lhe Equatorial Atlantic Oceano With the separation between the South American and African plates already completed and the increasing separation between lhe continental masses, other tecton ic mechanisms began to act during the Cenozoic (even though the Cretaceous tectonic regime lasted until the Neogene), like an E-W compressive stress l?eld (related to the spreading olthe oceanic floor along lhe M id-Atlantic Ridge and to the compression of the Andean Chain) effective Irom the Late Cretaceous, and a state of general extension olthe horizontal surface (due to the thermal uplift ofthe central portion of Borborema Province), effective during the Neogene. The overlap of these mechanisms during the Cenozoic led to the imprint of a complex tectonic framework, which apparently influenced the migration and entrapment 01 hydrocarbon in the Cear? Basin
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Interpreta??o s?smica e an?lise de atributos - ?rea do levantamento s?smico 3D de siririzinho (Bacia Sergipe-Alagoas, NE do Brasil)Francelino, Arthur V?ctor Medeiros 29 August 2011 (has links)
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Previous issue date: 2011-08-29 / The main objective of the present thesis was the seismic interpretation and seismic attribute
analysis of the 3D seismic data from the Siririzinho high, located in the Sergipe Sub-basin
(southern portion of Sergipe-Alagoas Basin). This study has enabled a better understanding
of the stratigraphy and structure that the Siririzinho high experienced during its
development. In a first analysis, we used two types of filters: the dip-steered median filter,
was used to remove random noise and increase the lateral continuity of reflections, and
fault-enhancement filter was applied to enhance the reflection discontinuities. After this
filtering step similarity and curvature attributes were applied in order to identify and
enhance the distribution of faults and fractures. The use of attributes and filtering greatly
contributed to the identification and enhancement of continuity of faults. Besides the
application of typical attributes (similarity and curvature) neural network and fingerprint
techniques were also used, which generate meta-attributes, also aiming to highlight the
faults; however, the results were not satisfactory. In a subsequent step, well log and seismic
data analysis were performed, which allowed the understanding of the distribution and
arrangement of sequences that occur in the Siririzinho high, as well as an understanding of
how these units are affected by main structures in the region. The Siririzinho high comprises
an elongated structure elongated in the NS direction, capped by four seismo-sequences
(informally named, from bottom to top, the sequences I to IV, plus the top of the basement).
It was possible to recognize the main NS-oriented faults, which especially affect the
sequences I and II, and faults oriented NE-SW, that reach the younger sequences, III and IV.
Finally, with the interpretation of seismic horizons corresponding to each of these
sequences, it was possible to define a better understanding of geometry, deposition and
structural relations in the area. / A presente disserta??o tem como objetivo principal a interpreta??o s?smica e an?lise
de atributos s?smicos do alto de Sirizinho, localizado na Sub-bacia de Sergipe (por??o sul da
Bacia Sergipe-Alagoas). Tal estudo possibilitou um melhor entendimento da estratigrafia e
estrutura??o que o alto experimentou durante o seu desenvolvimento. Em uma primeira
an?lise, foram utilizados dois tipos de filtros, sendo o dip-steered median filter, com a
finalidade de retirar os ru?dos aleat?rios e aumentar a continuidade lateral das reflex?es, e o
fault-enhancement filter para real?ar as descontinuidades das reflex?es. Ap?s esta etapa de
filtragem foram aplicados os atributos de similaridade e curvatura, para se identificar a
distribui??o das falhas. O uso dos atributos e filtragens colaborou fortemente para a
identifica??o e o realce da continuidade dos falhamentos. Al?m da aplica??o dos atributos
t?picos (similaridade e curvatura) foram utilizadas as t?cnicas de redes neurais e fingerprint,
que geram meta-atributos, tamb?m com o objetivo de real?ar os falhamentos. No entanto, os
resultados obtidos n?o foram satisfat?rios. Em etapa subsequente com a avalia??o dos perfis
geof?sicos e do dado s?smico, foi poss?vel realizar a interpreta??o sismoestrutural e
sismoestratigr?fica que permitiram o entendimento da distribui??o e arranjo das sequ?ncias
que capeiam o alto de Siririzinho, bem como da compreens?o de como estas unidades s?o
afetadas pelas principais estruturas da regi?o. O alto de Siririzinho compreende uma
estrutura d?mica alongada na dire??o N-S, capeada por quatro sismossequ?ncias
(informalmente nomeadas, da base para o topo, de sequ?ncias I a IV, al?m do topo do
embasamento). Foi poss?vel reconhecer falhamentos com orienta??o principal N-S, que
afetam especialmente as sequ?ncias I e II, e falhamentos com orienta??o NE-SW que
atingem as sequ?ncias mais jovens, III e IV. Por fim, com a interpreta??o dos horizontes
s?smicos correspondentes a cada uma dessas sequ?ncias, foi poss?vel definir um melhor
entendimento da geometria, deposi??o e das rela??es estruturais na ?rea estudada.
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Reservat?rio Tabatinga (Maca?ba-RN): qualidade ambiental, conflitos e usoGuedes, Josiel de Alencar 30 January 2015 (has links)
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Previous issue date: 2015-01-30 / Os reservat?rios s?o mananciais constru?dos ao longo de canais fluviais, com a
intercepta??o por barramentos feitos por concreto ou terra. No Brasil eles s?o constru?dos para
diversas finalidades, destacando-se a gera??o de energias (hidrel?tricas), regulariza??o de
vaz?o e cria??o de reservas h?dricas, e conten??o de enchentes, por isso desempenharam e
ainda desempenham papel importante na sociedade moderna. No semi?rido da regi?o
Nordeste, normalmente s?o utilizados para o abastecimento de cidades e como fonte de
alimenta??o. No Estado do Rio Grande do Norte, os grandes reservat?rios s?o destinados a
esta mesma finalidade. Cidades que se formaram ?s margens de rios, ou que tenham canais
fluviais cruzando seu espa?o, lidam com problemas relacionados e inunda??o. Na cidade de
Maca?ba-RN, esse processo ocorria sistematicamente durante o per?odo chuvoso, causando
grandes transtornos ? popula??o local. Fruto de reivindica??o coletiva, foi constru?do o
Reservat?rio de Tabatinga no rio Jundia?, a montante da cidade. Diante deste cen?rio, esta tese
visou analisar a qualidade socioambiental desse manancial. Para atingir esse objetivo, foram
empregadas metodologias centradas na averigua??o da qualidade de ?gua, al?m da aplica??o
de question?rio para conhecer a percep??o dos moradores da ?rea rural, onde o reservat?rio
foi constru?do e dos moradores da ?rea urbana da cidade. Os resultados mostraram a
exist?ncia de conflitos dos moradores das comunidades rurais e a presen?a do reservat?rio,
enquanto que para a popula??o da cidade, o reservat?rio ? considerado a solu??o correta para
o t?rmino das enchentes na zona urbana, mas entendem que tamb?m servem como fonte
econ?mica para a popula??o rural. Considerando a avalia??o da fonte de ?gua, este estudo
concluiu que o Reservat?rio Tabatinga est? impr?prio para uso, em fun??o da presen?a de
metais de signific?ncia toxicol?gica com potencial de causar danos ao material gen?tico dos
indiv?duos que utilizam esse a?ude para diversos fins, podendo levar s?rios riscos ? sa?de da
popula??o. / The reservoirs are water sources built along the fluvial basins, between rivers and dams made
by concrete or earth. In Brazil they are built for different purposes, standing out the generation
of energy (hydroelectric power station), flowing regulation, water reserves and flooding
control, therefore they have played and still play an important role in the modern society.In
the Northeastern semiarid region, they are typically used to supply cities and as a source of
food.In the state of Rio Grande do Norte, the large reservoirs are intended for the same
purpose.The cities settled in the riverbanks, or which have river channels crossing them, face
flooding related problems. In the city of Maca?ba-RN, flooding occurred systematically
during the rainy season, causing great inconvenience to the local population.As product of
the collective claim Tabatinga Reservoir in Jundia? river was built, upstream of the city.
Facing this background, this thesis aimed to assess the s?cio-environmental quality of this
reservoir.To achieve this goal, methodologies pointed to assess water quality along with the
aplication of a questionnaire were used aimed to verify the quality of water and to know the
perception of the residents from urban and rural ?rea settled near to the reservoir was
performed. The results showed the existence of conflicts of residents of rural communities
and the presence of the reservoir, while for the city's population, the reservoir is considered
not only the right solution to solve flooding in urban areas, but also as economic source for
the rural population. Considering the water source assessment, this study concluded that the
Tabatinga Reservoir is unfit for human use, due to the presence of metals of toxicological
significance with the potential to elicit damage to the genetic material of individuals that use
water from this reservoir, leading to cause serious risks to health population.
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An?lise econ?mica de um sistema de aproveitamento de ?gua de chuva em unidade hospitalar / Financial analysis of a rainwater harvesting system in hospital unitFonseca, M?rcio de Castro 02 December 2016 (has links)
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Previous issue date: 2016-12-02 / O uso de tecnologias de aproveitamento de ?gua de chuva vem se consolidando cada vez mais como fonte alternativa de suprimento de ?gua em diversos tipos de usos. A vantagem desta tecnologia se baseia na acessibilidade da ?gua durante a esta??o seca, com a possibilidade de substitui??o da ?gua proveniente do abastecimento p?blico. O objetivo deste estudo consistiu na an?lise financeira de dois projetos piloto de aproveitamento de ?gua de chuva para o abastecimento de lavanderia em unidade hospitalar nas cidades de Natal e Caic?. Para isso, foi desenvolvido um modelo de simula??o do comportamento hidrol?gico do sistema na escala di?ria. O estudo considerou a otimiza??o do uso da ?gua de chuva como forma de minimizar os custos de consumo da ?gua do abastecimento p?blico. Considerando as tecnologias atualmente dispon?veis, este estudo utilizou reservat?rio semienterrado com revestimento em geomembrana de polietileno de alta densidade (PEAD), tendo em vista a possibilidade de constru??o de reservat?rios de grande capacidade com baixo custo, adequado para situa??es de alta demanda e irregularidades na distribui??o da precipita??o. Foram realizadas simula??es envolvendo diferentes cen?rios de aproveitamento de ?gua de chuva, com a utiliza??o da ?gua em lavanderias das unidades hospitalares do Hospital Universit?rio Onofre Lopes (Natal) e do Hospital Regional do Serid? (Caic?). A an?lise financeira envolveu o Valor Presente L?quido, a Taxa Interna de Retorno e o payback. Ela permitiu selecionar a solu??o mais adequada para cada sistema. Os resultados obtidos para Natal demonstraram que o uso de um reservat?rio com capacidade de 500 m3 possibilitaria economia anual de R$ 81.143,10 (redu??o de 44% na conta de ?gua), e payback do sistema de sete meses. Para Caic?, um reservat?rio com capacidade de 2.000 m3 possibilitaria uma economia anual de R$ 40.154,00 (redu??o de 68% na conta de ?gua), e payback do sistema de 24 meses.
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Estudo da sismicidade na barragem do A?u no per?odo de 2012 a 2013Ferreira, Pedro Augusto Rodrigues 24 February 2016 (has links)
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Previous issue date: 2016-02-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / A atividade s?smica do Nordeste do Brasil tem sidoalvo constante de estudos, uma vez que esta ? regi?o mais ativa do pa?s.Contudo, algumas ?reas possuem seus terremotos relacionados com a??o humana, ouseja, s?o de car?ter induzido. A barragem do A?u constitui um exemplo cl?ssicode sismicidade induzida por reservat?rio e j? foi alvo de diversos estudos.Recentemente, ap?s um consider?vel per?odo sem que houvesse atividade s?smicana barragem, o LabSis/UFRN registrou, por meio de uma esta??o regional, eventosrelacionados com o a?ude, o que motivou a instala??o de uma rede local ao redorda barragem. A partir dos dados provenientes dessa rede, observou-se que aatividade s?smica est? relacionada com uma nova ?rea epicentral dento dabarragem. Os par?metros hipocentrais dessa atividade foram determinados, bemcomo o respectivo mecanismo focal. Verificou-se que eventos estavamrelacionados com a reativa??o do embasamento em uma nova falha subvertical comorienta??o NE-SW subparalela a falha de S?o Rafael. Esses resultados foramutilizados na elabora??o de um artigo cient?fico, o qual discutiu a rela??odessa sismicidade com a geologia da regi?o e tamb?m com o n?vel de ?gua doreservat?rio. O artigo mostrou que a difus?o da press?o de poro foi o mecanismoque controlou o disparo da sismicidade induzida na barragem. / The seismic activity in the Northeastern of Brazil has been a constant target of study, since it is the most active region of the country. However, some areas have their earthquakes related to human action, what means they are induced. The A?u dam is a classic example of reservoir-induced seismicity and it has been the subject of several studies. Recently, after a considerable period of inactivity, the LabSis / UFRN recorded events related to the dam, which led to the installation of a network around the reservoir. From the data provided by this network, it was observed that the seismic activity is related to a new epicental area inside the lake. The epicentral parameters and the focal mechanism were determined. It was found that the events were related to the reactivation of a basement structure in a new seismogenic subvertical fault with NE-SW-striking subparallel to the S?o Rafael Fault. These results were used in the preparation of a scientific paper, which discussed the relationship between this seismicity with the geology of the region and with the reservoir water level. The paper showed that the diffusion of pore pressure was the main mechanism that controlled the triggering of the induced seismicity at the reservoir.
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Estudo do acoplamento do po?o injetor nas simula??es de inje??o c?clica de vaporSouza J?nior, Jos? Cleodon de 20 February 2013 (has links)
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Previous issue date: 2013-02-20 / Steam injection is a method usually applied to very viscous oils and consists of injecting heat
to reduce the viscosity and, therefore, increase the oil mobility, improving the oil production.
For designing a steam injection project it is necessary to have a reservoir simulation in order
to define the various parameters necessary for an efficient heat reservoir management, and
with this, improve the recovery factor of the reservoir.
The purpose of this work is to show the influence of the coupled wellbore/reservoir on the
thermal simulation of reservoirs under cyclic steam stimulation. In this study, the
methodology used in the solution of the problem involved the development of a wellbore
model for the integration of steam flow model in injection wellbores, VapMec, and a blackoil
reservoir model for the injection of cyclic steam in oil reservoirs. Thus, case studies were
developed for shallow and deep reservoirs, whereas the usual configurations of injector well
existing in the oil industry, i.e., conventional tubing without packer, conventional tubing with
packer and insulated tubing with packer. A comparative study of the injection and production
parameters was performed, always considering the same operational conditions, for the two
simulation models, non-coupled and a coupled model. It was observed that the results are very
similar for the specified well injection rate, whereas significant differences for the specified
well pressure. Finally, on the basis of computational experiments, it was concluded that the
influence of the coupled wellbore/reservoir in thermal simulations using cyclic steam
injection as an enhanced oil recovery method is greater for the specified well pressure, while
for the specified well injection rate, the steam flow model for the injector well and the
reservoir may be simulated in a non- coupled way / A inje??o de vapor ? um m?todo aplicado geralmente em ?leos muito viscosos e
consiste em injetar calor para reduzir a viscosidade e, portanto, aumentar a mobilidade do
?leo, resultando em incremento na produ??o dos po?os. Para o planejamento de um projeto de
inje??o de vapor ? necess?rio efetuar um estudo de reservat?rio com o objetivo de se definir
os v?rios par?metros necess?rios para um eficiente gerenciamento de calor no meio poroso e,
com isto, melhorar o fator de recupera??o do reservat?rio. Neste estudo, para o sistema de
inje??o, representado pelo po?o injetor, ? normalmente adotado um modelo padr?o em todos
os casos estudados, sendo desta forma, a integra??o entre o po?o injetor e o reservat?rio,
realizada de forma bastante simplificada. Este trabalho tem como objetivo mostrar a
influ?ncia do acoplamento do po?o injetor nas simula??es t?rmicas de reservat?rios
submetidos ? inje??o c?clica de vapor. Neste estudo, a metodologia utilizada na solu??o do
problema envolveu o desenvolvimento de um modelo de po?o para a integra??o do modelo de
escoamento de vapor em po?os de petr?leo, VapMec, e o modelo de reservat?rio tipo beta
para a inje??o c?clica de vapor em reservat?rios de petr?leo. Assim, desenvolveram-se estudos
de caso para reservat?rios rasos e profundos, considerando as principais configura??es de
po?o injetor existentes na ind?stria de petr?leo, ou seja, coluna convencional sem packer,
coluna convencional com packer e coluna isolada com packer. Foi realizado um estudo
comparativo dos par?metros de inje??o e produ??o obtidos na simula??o, considerando
sempre as mesmas condi??es de opera??o, para os dois modelos de simula??o, sendo um
modelo n?o acoplado e o outro modelo acoplado. Observou-se que os resultados entre os
modelos s?o bastante similares para a situa??o de vaz?o de inje??o igual ? vaz?o especificada,
tendo sido encontrado diferen?as significativas na situa??o em que a press?o de inje??o ?
igual ? press?o especificada. Finalmente, com base nos experimentos computacionais, foi
poss?vel concluir que a influ?ncia do acoplamento do po?o injetor nos estudos de
reservat?rios que utilizam a inje??o c?clica de vapor como m?todo especial de recupera??o ?
maior para a condi??o de press?o especificada, sendo que para a condi??o de vaz?o
especificada, o modelo de escoamento no po?o injetor e o modelo do reservat?rio podem ser
simulados de forma n?o integrada
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Uso do GPR na gera??o de modelos est?ticos 3D para o planejamento de lavra de minerais pesados depositados em dunas e?licasSouza, Anderson de Medeiros 29 February 2008 (has links)
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Previous issue date: 2008-02-29 / Petr?leo Brasileiro SA - PETROBRAS / This project was developed as a partnership between the Laboratory of Stratigraphical Analyses of the Geology Department of UFRN and the company Millennium Inorganic Chemicals Minera??o Ltda. This company is located in the north end of the paraiban coast, in the municipal district of Mataraca. Millennium has as main prospected product, heavy minerals as ilmenita, rutilo and zircon presents in the sands of the dunes. These dunes are predominantly inactive, and overlap the superior portion of Barreiras Formation rocks. The mining happens with the use of a dredge that is emerged at an artificial lake on the dunes. This dredge removes sand dunes of the bottom lake (after it disassembles of the lake borders with water jets) and directs for the concentration plant, through piping where the minerals are then separate. The present work consisted in the acquisition external geometries of the dunes, where in the end a 3D Static Model could be set up of these sedimentary deposits with emphasis in the behavior of the structural top of Barreiras Formation rocks (inferior limit of the deposit). The knowledge of this surface is important in the phase of the plowing planning for the company, because a calculation mistake can do with that the dredge works too close of this limit, taking the risk that fragments can cause obstruction in the dredge generating a financial damage so much in the equipment repair as for the stopped days production. During the field stages (accomplished in 2006 and 2007) topographical techniques risings were used with Total Station and Geodesic GPS as well as shallow geophysical acquisitions with GPR (Ground Penetrating Radar). It was acquired almost 10,4km of topography and 10km of profiles GPR. The Geodesic GPS was used for the data geopositioning and topographical rising of a traverse line with 630m of extension in the stage of 2007. The GPR was shown a reliable method, ecologically clean, fast acquisition and with a low cost in relation to traditional methods as surveys. The main advantage of this equipment is obtain a continuous information to superior surface Barreiras Formation rocks. The static models 3D were elaborated starting from the obtained data being used two specific softwares for visualization 3D: GoCAD 2.0.8 and Datamine. The visualization 3D allows a better understanding of the Barreiras surface behavior as well as it makes possible the execution of several types of measurements, favoring like calculations and allowing that procedures used for mineral extraction is used with larger safety / Este projeto foi desenvolvido como forma de uma parceria entre o Laborat?rio de An?lises Estratigr?ficas do Departamento de Geologia da UFRN e a empresa Millennium Inorganic Chemicals Minera??o Ltda. Esta mina localiza-se no extremo norte do litoral paraibano, no munic?pio de Mataraca, tendo como principal produto prospectado, minerais pesados como ilmenita, rutilo e zirc?o presentes nas areias das dunas. Tais dunas, predominantemente inativas, repousam sobre a por??o superior das rochas silicicl?sticas da Forma??o Barreiras. A minera??o se d? atrav?s do uso de uma draga que fica emersa em um lago artificial sobre as dunas. Esta retira a areia das dunas do fundo do lago (ap?s o desmonte das bordas do lago com jatos de ?gua) e encaminha para a planta de concentra??o, atrav?s de tubula??es onde os minerais s?o ent?o separados. O presente trabalho consistiu na aquisi??o das geometrias externa e interna das dunas, de forma que ao final se pudesse montar um Modelo Est?tico 3D destes dep?sitos sedimentares, com ?nfase no comportamento do topo estrutural das rochas da Forma??o Barreiras (limite inferior da jazida). O conhecimento detalhado desta superf?cie ? de fundamental import?ncia na fase do planejamento da lavra pela empresa, visto que um erro de c?lculo pode fazer com que a draga trabalhe pr?ximo demais deste limite, correndo o risco de que fragmentos possam causar obstru??o na draga gerando um preju?zo financeiro tanto no reparo do equipamento como pelos dias parados de produ??o. Durante as etapas de campo (realizadas nos anos de 2006 e 2007) foram utilizadas t?cnicas de levantamentos topogr?ficos com Esta??o Total e GPS Geod?sico bem como aquisi??es geof?sicas rasas com GPR (Ground Penetrating Radar). Foram adquiridos aproximadamente 10,5Km de topografia e 10Km de perfis GPR. O GPS Geod?sico foi utilizado para o georreferenciamento dos dados e levantamento topogr?fico de uma linha transversal com 630m de extens?o na etapa de 2007. O GPR mostrou-se um m?todo confi?vel, ecologicamente limpo, de r?pida aquisi??o e com um baixo custo em rela??o a m?todos tradicionais como sondagens. A principal vantagem do uso deste equipamento ? obter uma informa??o cont?nua da superf?cie superior da Forma??o Barreiras. Os modelos est?ticos 3D foram elaborados a partir dos dados obtidos utilizando-se dois softwares espec?ficos para ambientes 3D: GoCAD 2.0.8 e o Datamine. A visualiza??o em ambiente 3D permite uma melhor compreens?o do comportamento da superf?cie do Barreiras bem como possibilita a execu??o de diversos tipos de medi??es, favorecendo assim uma melhor cubagem da jazida e permitindo que os procedimentos utilizados para extra??o mineral sejam utilizados com maior seguran?a
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Avalia??o do controle da diag?nese na qualidade de reservat?rio silicicl?stico do cenomaniano superior da forma??o A?u, sudoeste da bacia potiguarMartins, Rosiney Ara?jo 01 July 2014 (has links)
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Previous issue date: 2014-07-01 / A distribui??o das altera??es diagen?ticas em reservat?rio silicicl?stico do Cenomaniano
Superior da Bacia Potiguar sofreu influ?ncia do arcabou?o estratigr?fico e do sistema
deposicional. Se??es s?smicas e perfis geof?sicos de dois po?os perfurados na por??o SW da
citada bacia registram superf?cies estratigr?ficas regionais representativas de inunda??es
m?ximas relacionadas a evento transgressivo. Na an?lise sequencial de oitenta metros de
testemunhos (~450m de profundidade) foram reconhecidas nove f?cies deposicionais cujo
padr?o de empilhamento granodecrescente ascendente limita ciclos com base conglomer?tica
erosiva (lag) sobreposta por intercala??es de arenitos m?dios a muito finos com
estratifica??es cruzadas (acanalada, planar e de baixo ?ngulo) e horizontais (plano-paralela,
wave e flaser). O topo dos ciclos ? marcado pela deposi??o de pelitos e desenvolvimento de
paleossolos e laguna. A correla??o de f?cies geneticamente relacionadas revela associa??es de
preenchimento de canal, crevasse e plan?cie de inunda??o, depositadas em trato de sistema
transgressivo. Descri??es detalhadas de setenta e nove l?minas delgadas auxiliadas por
an?lises de MEV-EBSD/EDS, DRX e is?topos est?veis em arenitos revelaram composi??o
arcosiana e arranjos texturais complexos com abundantes franjas de esmectita cobrindo
continuamente constituintes prim?rios, cut?culas mecanicamente infiltradas e poros m?ldicos
e intragranulares. Crescimentos epitaxiais de K-feldspato cobrem continua ou
descontinuamente gr?os de microcl?nio e ortocl?sio antes de qualquer outra fase. Abundante
pseudomatriz da compacta??o de intraclastos lamosos, concentrados ao longo de planos de
estratifica??o, localmente substitu?da por calcita macrocristalina e pirita microcristalina e
framboidal. Caulinita (livrinhos e vermicular), esmectita microcristalina, minerais de tit?nio
microcristalinos e pirita substituem constituintes prim?rios. Porosidade intergranular
predomina sobre a m?ldica, intragranular e de contra??o. Os poros s?o mal conectados devido
? presen?a intergranular de esmectita, crescimentos de K-feldspato, argilas infiltradas e
pseudomatriz. Os arenitos foram sujeitos a condi??es eodiagen?ticas pr?ximas ? superf?cie e
mesodiagen?ticas de soterramento raso. As altera??es diagen?tica reduziram a porosidade e
permeabilidade deposicionais principalmente pela precipita??o de franjas de esmectita,
compacta??o de intraclastos lamosos ? pseudomatriz e cimenta??o por calcita poiquilot?pica,
caracterizando diferentes petrof?cies de reservat?rio. Esses produtos diagen?ticos atuaram
como barreiras e desvios ao fluxo de fluido reduzindo qualidade do reservat?rio. / The distribution of diagenetic alterations in Late Cenomanian siliciclastic reservoirs from
Potiguar Basin was influenced by the stratigraphic framework and the depositional system.
Seismic sections and geophysical logs of two wells drilled in the SW portion of the mentioned
basin above register regional stratigraphic surfaces representing maximum floods related to a
transgressive event. The sequential analysis of 80 m of drill core (~450 m deep) recognized
nine depositional facies with an upwards granodecrescent standard piling that limits cycles
with an erosional conglomeratic base (lag) overlain by intercalations of medium to very fine
sandstones showing cross bedding (channel, planar and low angled) and horizontal bedding
(plane-parallel , wave and flaser). The top of the cycles is marked by the deposition of pelites
and the development of paleosoils and lagoons. The correlation of genetically related facies
reveals associations of channel fillings, crevasse, and flood plains deposited in a transgressive
system. Detailed descriptions of seventy nine thin sections aided by MEV-EBSD/EDS, DRX
and stable isotope analyses in sandstones revealed an arcosian composition and complex
textural arrays with abundant smectite fringes continuously covering primary components,
mechanically infiltrated cuticles and moldic and intragrain pores. K-feldspar epitaxial
overgrowth covers microcline and orthoclase grains before any other phase. Abundant
pseudomatrix due to the compactation of mud intraclasts concentrate along the stratification
planes, locally replaced by macrocristalline calcite and microcrystalline and framboidal
pyrite. Kaolinite (booklets and vermicular), microcrystalline smectite, microcrystalline
titanium minerals and pyrite replace the primary components. The intergrain porosity prevails
over the moldic, intragrain and contraction porosities. The pores are poorly connected due to
the presence of intergranular smectite, k-feldspar overgrowth, infiltrated mud and
pseudomatrix. The sandstones were subjected to eodiagenetic conditions next to the surface
and shallow burial mesodiagenetic conditions. The diagenetic alterations reduced the porosity
and the permeability mainly due to the precipitation of smectite fringes, compactation of mud
intraclasts onto the pseudomatrix and cementing by poikilotopic calcite characterizing
different reservoir petrofacies. These diagenetic products acted as barriers and detours to the
flow of fluids thus reducing the quality of the reservoir.
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