Determinação de propriedades petrofísicas de rochas via simulação: um caminho interdisciplinar

et al. 2022

Preprint

The objective of this work is to physically characterize and analyze synthetic carbonate rocks through microtomography and petrography techniques, focusing on a comparative analysis before and after degradation with a reactive fluid. For this study, physical characterization analysis with computerized microtomography and petrography on the samples before and after the acidification procedure was performed. The petrographic analysis verified an increase in both intergranular and intragranular porosities after dissolution. The microtomography analysis quantified the maximum increase in porosity, from 11.8% to 41.3% in the two-dimensional analysis and 31.6% to 52% in the three-dimensional analysis of the porous structures. Furthermore, the pores were quantified according to their area, and data was obtained on the orientation of the pores, providing insight into the preferred paths of fluid flow. It was also observed that the microtomography technique was an effective tool for characterizing fractures in the samples before and after dissolution. Such analyses are crucial for the extraction and injection of fluids at high depths due to the mechanical and physical risks arising from the dissolution of minerals as well as changes in pressure, temperature, and saturation, all of which affect the stress state of the reservoir rock.

Section: Computerized Microtomographymentioning

confidence: 99%

Application of Microtomography and Petrography Techniques For the Characterization of Porosity and Distribution of Synthetic Carbonatic Rock Minerals Before and After Acidification Processes

Galindo

Lins

et al. 2022

Preprint

“… 18 emphasized the importance of experimental test data for the development of simulation algorithms. Such algorithms are used to improve rock characterization analyses via μCT, which is crucial for enhancing oil extraction.…”

Section: Introductionmentioning

confidence: 99%

Application of microtomography and petrography techniques for the characterization of porosity of synthetic carbonatic rock minerals before and after acidification processes

Galindo

Lins

et al. 2022

Sci Rep

The objective of this work is to physically characterize and analyze synthetic carbonate rocks through microtomography and petrography techniques, focusing on a comparative analysis before and after degradation with a reactive fluid. For this study, physical characterization analysis with computerized microtomography and petrography on the samples before and after the acidification procedure was performed. The petrographic analysis verified an increase in both intergranular and intragranular porosities after dissolution. The microtomography analysis quantified the maximum increase in porosity, from 11.8 to 41.3% in the two-dimensional analysis and 31.6–52% in the three-dimensional analysis of the porous structures. Furthermore, the pores were quantified according to their area, and data was obtained on the orientation of the pores, providing insight into the preferred paths of fluid flow. It was also observed that the microtomography technique was an effective tool for characterizing fractures in the samples before and after dissolution. Such analyses are crucial for the extraction and injection of fluids at high depths due to the mechanical and physical risks arising from the dissolution of minerals as well as changes in pressure, temperature, and saturation, all of which affect the stress state of the reservoir rock.

“…Para a determinação de parâmetros relevantes deste problema, tal como a porosidade, são utilizados métodos diretos que analisam lâminas de rochas, i.e. petrografia, ou por métodos indiretos que fazem uso de injeção de gás ou mercúrio em picnômetros [3][4][5]. Entretanto, a quantificação por petrografia necessita um trabalho minucioso e normalmente os resultados são limitados à análise bidimensional das lâminas [4,5] limitada à resolução da imagem.…”

Section: Introductionunclassified

“…petrografia, ou por métodos indiretos que fazem uso de injeção de gás ou mercúrio em picnômetros [3][4][5]. Entretanto, a quantificação por petrografia necessita um trabalho minucioso e normalmente os resultados são limitados à análise bidimensional das lâminas [4,5] limitada à resolução da imagem. No caso dos métodos indiretos, apesar de fornecerem informações sobre e o volume de poros, apresentam desvantagens como erros sistemáticos relacionados à penetração ineficiente e porosidade induzida pela injeção do fluido [3,4].…”

Section: Introductionunclassified

“…O Processamento de imagens é uma ferramenta interdisciplinar importante para diferentes áreas, dentre elas podemos citar: Ciência dos Materiais (Metalurgia, Microscopia, Nanoscopia, Magnetismo) [4,5,7,8], Ciências biológicas (Biologia, Genética, Botânica) [7,8], Geologia [2,4,7,9], Geografia e Meteorologia [7,8], Astronomia entre outras. No contexto das imagens de Micro-CT o processamento de imagem digital é comumente utilizado como uma ferramenta para determinação e caracterização do sistema grãos e poros [7,8].…”

Section: Introductionunclassified

See 1 more Smart Citation

Segmentation of Microtomography images of rocks using texture filter

Dias

Faria

et al. 2016

Resumo: A segmentação, realizada de maneira robusta, automatizada e eficiente, de diferentes fases em imagens de microtomografia é um fator crítico e limitador na área de Petrofísica de Rocha Digital. Abordamos a questão partindo de um algoritmo com técnicas baseadas em filtros, obtendo a maximização da Entropia Local para definir um limiar entre fundo e objeto. Validamos a qualidade da segmentação a partir de imagens de amostras de microesferas de vidro, recuperamos o raio das esferas e comparamos a técnica proposta com outros dois algoritmos de segmentação.