Estudo da porção offshore da bacia do Benin e o seu potencial no armazenamento de hidrocarbonetos, margem equatorial africana

Pós-graduação em Geologia Regional - IGCE

Comportamento dinâmico não-linear de um sistema mecânico com vibrações associadas a uma transição brusca na rigidez

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Determinação estatística dos contatos fluidos em perfis de poço

No interior dos reservatórios petrolíferos, o efeito da gravidade produz naturalmente a segregação dos fluidos presentes. Em razão basicamente das forças capilares não existe uma superfície definida de separação entre cada dois fluidos. No entanto, é comum na engenharia de petróleo admitir-se uma superfície convencional de separação dos fluidos. À essa superfície dá-se o nome de interface fluida ou contato fluido. A obtenção da localização dos contatos fluidos no interior dos reservatórios, como os contatos óleo-água, contatos gás-água e os contatos gás-óleo, sem a interpretação completa dos perfis geofísicos ou a realização dos procedimentos diretos dos testes de formação é um problema de difícil solução para a indústria do petróleo. O posicionamento em profundidade dos contatos pode ser utilizado para a definição dos procedimentos de completação do poço e para o posicionamento do canhoneio nos horizontes produtores dos poços verticais. Temos também a aplicação do mapeamento deste parâmetro, para os projetos e controle da perfuração no caso dos poços direcionais e horizontais, que utilizam tal informação para o posicionamento do eixo do poço no interior da zona de hidrocarboneto no reservatório, a fim de se evitar, principalmente, a produção de água. Este trabalho apresenta uma metodologia para a identificação e posicionamento dos contatos fluidos, através da aplicação da técnica da estatística multivariada, chamada de análise discriminante. Nesta aplicação, faz-se uso direto dos perfis de resistividade (R_T), de raios gama natural (RG), de densidade (ρ_b), de porosidade neutrônica (Φ_N), de caliper (Cal) e do perfil de volume de argila (Vcla), como dados de entrada no programa de análise discriminante. Para o caso de depósitos clásticos, com seqüências arenito-folhelho, a análise discriminante fornece ainda a indicação da litologia e as espessuras aparentes dos reservatórios. As curvas de perfis geofísicos aplicadas para a avaliação desta metodologia são provenientes de poços perfurados na bacia do lago Maracaibo, na Venezuela, onde, segundo estudos geológicos, existe a ocorrência de seqüências estratigráficas, com camadas de folhelhos e arenitos, sendo também confirmada a presença de hidrocarbonetos nos poços utilizados neste trabalho.

Effects of calcium salts of soybean oil on factors that influence pregnancy establishment in Bos indicus beef cows

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

In Vitro Antiparasitic Activity and Chemical Composition of the Essential Oil Obtained from the Fruits of Piper cubeba

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

The effect of a minor constituent of essential oil from Citrus aurantium: The role of beta-myrcene in preventing peptic ulcer disease

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Macadamia Oil Supplementation Attenuates Inflammation and Adipocyte Hypertrophy in Obese Mice

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Caracterização dos reservatórios do grupo Macaé no Campo de Garoupa - Bacia de Campos - por meio de interpretação sísmica e perfis de poço

The study area is the Garoupa Field, located 75 km from the coast of Rio de Janeiro in bathymetric elevation of 125 m and it is the first important offshore discovery of the Campos Basin with hydrocarbon production in the Albian carbonates. The high significance of carbonate rock reservoirs for the global oil industry and its degree of complexity, combined with the fact that the Garoupa Field is a mature field, make this research project interesting to develop a re-exploratory vision of the study area. The objective of this paper is to characterize the physical properties of the Macae Group reservoirs in the Garoupa Field through well correlation techniques, petrophysical analysis and seismic interpretation (3D), in order to evaluate qualitatively and quantitatively the response of geophysical data to the presence of carbonate rock reservoirs. From the analysis of well profiles (gamma ray, resistivity, density and sonic) it was possible to identify six reservoir levels in the Quissamã Formation. As a result, the reservoirs have good correlation between the wells in the Garoupa Field and show lateral facies variation. In the seismic interpretation, structural contour maps were generated in time (ms) from the top of the Macae Group and two horizons that correspond to the reservoir levels. These maps show that the oil producing area of this field is a structural high located at the west of the interpreted seismic cube, and it was classified as a rollover limited by lateral faults forming a horst. The seismic attribute maps show a good response to the reservoirs of the Garoupa Field because they are associated with amplitude anomalies, verified by the correlation between the physical properties of the reservoir rock and seismic data through cross plots, with emphasis in a linear correlation between the resistivity profile and the values of Maximum Absolute Amplitude and RMS Amplitude attributes

Evolução tectonossedimentar dos principais reservatórios de hidrocarbonetos do Campo de Golfinho (Bacia do Espírito Santo)

The Golfinho Field is located in the offshore region of the Espírito Santo Basin. Its importance is linked to the current average production about 19,000 barrels of oil per day, in turbidite reservoirs , giving it the nineteenth placement among the largest oil fields producing of Brazil. By interpretation and correlation’s methods based on 2D seismic sections and geophysical well logs, the study of tectonic-sedimentary evolution of major Golfinho Field’s reservoirs, which are located in Maastrichtian , aims understand and characterize the geological model of the area for the purpose of identify the main structures and types of reservoirs, improving the geological understanding of the area and using this knowledge at similar sets, that may present exploratory success in similar cases. By structural contour maps and geological cross-sections generated since time-depth conversion , the results defined for the geological model of the area , two distinct tectonic styles: a distensinal tectonics style , characterized by grabens and horsts , which belongs to rift phase, and a salt tectonics style, characterized by salt domes , listric faults and folds rolllover folds type, which belongs to marine phase . The interpretation of seismic sections and subsequent analysis of the main deformations present in the Maastrichtian reservoirs rocks ( turbidites ) showed that the northern region of the field is the most affected by salt tectonics . As for reservoirs, it was concluded to be associated to tectonics formed by rollover folds type, being older than listric faults

Effect of rosemary (Rosmarinus officinalis) extracts on the oxidative stability and sensory acceptability of soybean oil

Background: Plant extracts have b een used as an alternative to the use of synthetic antioxidants in order to preserve oils fromoxidative degradation. Additionally, these extracts add special flavors and aromas to the food. Thus, the objective of this studywas to evaluate the effect of hydroethanolic extracts of fresh and freeze-dried rosemar y in the oxidative stability of soybean oilunder accelerated storage in an oven. Results: The application of the extracts in the oil showed that that freeze-dried extract was better in reducing the formation ofoxidation products, showing 8.6 meq kg−1of peroxides after 20 days of storage. On the other hand, the mixture of the naturalextract with t-butylhydroquinone conferred better oxidative stability index until the 20th day, 9.7 h. Both extracts prevented theloss of tocopherol, not d iffering between each other (P > 0.05), and present approximately 505 mg kg−1of residual tocopherols.The sensory evaluation revealed that consumers accepted equally the oils added and not added of the rosemary extracts. Conclusion: The extracts are therefore potential sources of natural antioxidants and they would be well accepted by consumersif applied by the food industry to replace synthetic antioxidants.

Antioxidant effect of thyme ( -L.) and oregano ( -L.) extracts in soybean oil under thermoxidation

The rancidity of vegetable oils is considered one problem in the food industry,thus, are added antioxidants in food. The objective of this study was to investigatethe antioxidant effect of oregano and thyme extracts in soybean oil underthermoxidation. Soybean oil containing 3,000 mg/kg of oregano and thyme oleo-resins and the mixture of both, as well as soybean oil containing tert-butylhydroquinone (TBHQ; 50 mg/kg) and soybean oil free of were subjected tothermoxidation. Then, the physicochemical properties and fatty acid profile wereevaluated. Oregano and thyme oleoresins applied separately presented a higherprotective effect, inhibiting a greater formation of polar compounds than the anti-oxidant TBHQ, indicating that the addition of 3,000 mg/kg has ensured a betteroxidative protection than the synthetic antioxidant. The increase in the concentra-tion of oleoresins by mixing thyme and oregano extracts has given a higher pro-tective effect.

Effect of oil overlay on inhibition potential of roscovitine in sheep cumulus-oocyte complexes

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Diurnal effects on spearmint oil yields and composition

'Native'spearmint (Mentha spicata L.) is one of the two spearmint species grown commercially in the United States and other countries for essential oil production. The two major constituents of spearmint oil are carvone and limonene. It is not known if the essential oil yield (content) and composition of spearmint oil are affected by diurnal variation, and when it would be the best time for harvesting flowering spearmints within a 24h period. Therefore, the objective of this study was to evaluate the effect of diurnal variation on yield and composition of spearmint 'Native'essential oil for the environmental conditions of Northern Wyoming, at elevation 1170 m above the sea level. The experiment was conducted on a 3-year old well established spearmint plantation. The harvest times were every 2 h within a 24-h period: 7:00 AM, 9:00 AM, 11:00AM, 1:00 PM, 3:00 PM, 5:00 PM, 7:00 PM, 9:00 PM, 11:00 PM, 1:00 AM, 3:00 AM, and 5:00 AM. Essential oil yield varied from 0.96 to 1.47 g of oil per 100 g of dry herbage; the maximum oil yield was obtained at 9:00 AM and the minimum at 7:00 PM. The concentration of carvone in the oil varied from 44.1% (at 1:00 PM) to 66.4% (at 9:00 PM) of the total oil. However, the yield of carvone (a function of oil yield and carvone concentration in the oil) was the highest at 3:00 AM and the lowest at 1:00 PM. The concentration of limonene (10.7-15.8% of the oil) was the highest at 7:00 PM and the lowest at 1:00 PM, whereas the yield of limonene was the highest at 9:00 PM. For best essential oil yields, flowering spearmint should be harvested at around 9:00 AM. However, to obtain oil with high carvone concentration, spearmint should be harvested at 9:00 PM. Harvests at 1:00 PM would result in spearmint oil with low concentrations of both carvone and limonene, and hence, should be avoided. (C) 2014 Elsevier B.V. All rights reserved.

Controlling Asian soybean rust (Phakopsora pachyrhizi) with Bacillus spp. and coffee oil

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

The application of neural networks to the analysis of dissolved gases in insulating oil used in transformers

The state of insulating oils used in transformers is determined through the accomplishment of physical-chemical tests, which determine the state of the oil, as well as the chromatography test, which determines possible faults in the equipment. This article concentrate on determining, from a new methodology, a relationship among the variation of the indices obtained from the physical-chemical tests with those indices supplied by the chromatography tests.The determination of the relationship among the tests is accomplished through the application of neural networks. From the data obtained by physical-chemical tests, the network is capable to determine the relationship among the concentration of the main gases present in a certain sample, which were detected by the chromatography tests.More specifically, the proposed approach uses neural networks of perceptron type constituted of multiple layers. After the process of network training, it is possible to determine the existent relationship between the physical-chemical tests and the amount of gases present in the insulating oil.