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Previous issue date: 2011-12-27 === The global warming, due to the accumulation of greenhouse gases (GHG) emissions in the atmosphere, has been producing an increase in global mean temperature and by the large engineering projects, intended to reduce and stabilize the concentration of GHG in the atmosphere, especially CO2. Among the seven key technologies for reducing GHG emissions is the carbon capture and storage (CCS), which consists in capture, transport and storage CO2 in geological media, for example, saline aquifers, oil and gas fields and non-mineable coal seams. The latter to be the object of the present study was detailed and the procedures adopted for the analysis in coal seams consist of scanning two samples of Brazilian coal by means of X-ray computed tomography images to obtain two-dimensional system containing the cleats and better understand the gas flow in the layers. This tool is being tested for the first time in coals of Brazil and it s fundamental to understanding the development of projects of Coalbed Methane (CBM) and Enhanced Coalbed Methane (ECBM) in the county, that is still an unknow potencial, wich could increase the demand for natural gas in the regional energy supply. From this work it was concluded that the cleats of coal samples studied are easily identified and it is possible to extract relevant data about orientation, spacing, length and volume of cleats per area. The cleats of the coals studied, however, are very small compared with data from foreign literature, are also filled with calcium carbonate, which hinders the CO2 and CH4 flow in the coal seam and reduces the permeability unfeasible to implement projects of geological storage of CO2 in the coal seam from this study. === O aquecimento global, decorrente do ac?mulo de gases de efeito estufa (GEE) na atmosfera, vem produzindo um aumento na temperatura m?dia global e por meio de grandes projetos de engenharia pretende-se reduzir e estabilizar a concentra??o dos GEE na atmosfera, principalmente o CO2. Dentre as sete principais tecnologias para redu??o das emiss?es de GEE est? a Captura e Armazenamento de Carbono (CCS), que consiste na captura, transporte e armazenamento de CO2 em meios geol?gicos como, por exemplo, os aqu?feros salinos, campos de ?leo e g?s e camadas de carv?o n?o miner?veis. Este ?ltimo por ser objeto de estudo deste trabalho foi detalhado e os procedimentos adotados para sua an?lise em camadas de carv?o consistem em escanear duas amostras do Brasil por meio da tomografia computadorizada de raios-X, para obter imagens bidimensionais do sistema de cleats e melhor entender o fluxo de gases nas camadas. Esta ferramenta est? sendo testada pela primeira vez em carv?es do Brasil e seu entendimento ? fundamental para o desenvolvimento de projetos de Coalbed Methane (CBM) e Enhanced Coalbed Methane (ECBM) no pa?s que ainda ? um potencial desconhecido, podendo aumentar a demanda de g?s natural na matriz energ?tica regional. A partir deste trabalho concluiu-se que os cleats das amostras de carv?o estudadas s?o facilmente identificados e que ? poss?vel extrair dados relevantes sobre a orienta??o, espa?amento, comprimento e volume de cleats por ?rea. Os cleats dos carv?es estudados al?m de serem muito pequenos, se comparados com dados da literatura estrangeira, tamb?m est?o preenchidos por carbonatos de c?lcio, que dificulta o fluxo do CO2 e CH4 camada de carv?o e reduz a permeabilidade do meio inviabilizando a implanta??o de projetos de armazenamento geol?gico de CO2 na camada de carv?o em estudo.
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