X-ray microtomography application in pore space reservoir rock

Oliveira, Milena; Lima, I.; Borghi, Leonardo; Lopes, Ricardo Tadeu

doi:10.1016/j.apradiso.2011.11.047

Cited by 22 publications

(6 citation statements)

References 8 publications

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“…Case 1 represents the reference case, where the system was calibrated to work with a detector matrix of 2240 × 2240 pixels, a pixel size of 18.16 µm, a voltage of 130 kV and a current of 61 µA, with an additional filter of copper of 0.5 mm, 5 frames and a total rotation of 360 • . These parameters were based on the literature [4,8].…”

Section: Microctmentioning

confidence: 99%

Optimization of image resolution parameters to characterize carbonate rocks through representative elementary volume analysis.

Santos¹,

Machado²,

Araújo³

et al. 2018

J. Inst.

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X-ray computed microtomography (microCT) is a powerful nondestructive and noninvasive technique for 2D and 3D structure analyses. However, the parameters used in the image acquisition process have a direct influence on the qualitative and quantitative results, such as porosity, and on the characterization of samples, such as carbonate rocks, due to the spatial resolution of the image. The aim of this study is to determine the influence of these parameters on the results through tests in which these parameters are changed in different scenarios and system characterizations. In addition, with the optimum parameters, the whole sample image was acquired for characterization and compared to the homogeneity and representativeness of one part of the sample. The results demonstrate that the pixel size and detector matrix are the main parameters that influence the spatial resolution and that the use of additional filters for better image quality is essential. Microtomography is considered an excellent technique for rock characterization by using the best image spatial resolution possible.

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Section: Microctmentioning

confidence: 99%

Optimization of image resolution parameters to characterize carbonate rocks through representative elementary volume analysis.

Santos¹,

Machado²,

Araújo³

et al. 2018

J. Inst.

Self Cite

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“…These rocks are very heterogeneous, fractured, and characterized by great variation of textures . The understanding of the structures and textures, types, and distribution of pores, as well as their quantification are important for the reservoir characterization …”

Section: Introductionmentioning

confidence: 99%

Characterization of carbonate rocks through X‐ray microfluorescence and X‐ray computed microtomography

et al. 2019

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Carbonate rocks play an important role in petroleum geology by acting as reservoir rocks, generators, and even hydrocarbon sealants, accounting for about half of the oil and gas reserves known in the world. The study of these carbonate rocks have become very important in the hydrocarbon exploration scene in Brazil because of they consist in analogous for reservoir rocks of the presalt interval. Thus, the objective of this research was to use X‐ray microfluorescence (micro‐XRF) and X‐ray microtomography analysis, as complementary techniques, in order to characterize samples of carbonate rocks in respect to their structures, textures, mineralogy, and pores. The microtomographic analyses allowed the identification of the horizontal structures as parallel lamination, horizontal, and vertical fractures filled by calcite and biotic constituents (gastropods bioclasts). Different composition of minerals were also identified, as calcite, quartz, feldspars, iron sulfides, and oxides. The porosity (ranges <1 to17%), and the high‐density elements could also be quantified, as well as their distribution in each sample. The micro‐XRF analysis present a direct relationship with the distribution of minerals that compound carbonate rocks, highlighting some structures, as well as helping to identify trace and minor elements in the carbonates (Mn, Sr, and Mg).

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“…Nevertheless, most of the research using µ-CT is usually restricted to the characterization of reservoir rocks, highlighting different methods and procedures applied to the quantification and classification of petrophysical parameters, as well as their limitations (Arns et al, 2005;Al-Kharusi, 2007;Cnudde & Boone, 2013;Machado et al, 2014;Schmitt et al, 2016), whereas some authors applied the characterization method to different rocks in order to quantify petrophysical properties or even to visualize features and relevant structures to complement the description of reservoir rocks (Appoloni et al, 2007;Reis Neto et al, 2011;Oliveira et al, 2012;Mantovani, 2013;Schmitt, 2014;Jia et al, 2014;Voorn et al, 2015). Additionally, very few studies have associated petrophysical properties extracted via µ-CT with carbonate facies in a way that could make the integration of petrophysical and geologic information possible.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Pore System Properties of Coquinas From Morro Do Chaves Formation by Means of X-Ray Microtomography

et al. 2018

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ABSTRACT. The recent increase in the use of X-ray microtomography (μ-CT) for reservoir rock characterization can be explained by numerous factors, such as its non-destructive nature, higher spatial resolution and 3D pore space visualization, which were explored in this work to evaluate the pore system of coquinas, a potential reservoir rock mainly composed of shells and their fragments. However, most of the recent studies have not considered an association between petrophysical parameters extracted via μ -CT and coquina facies. For this reason, this work had the goal to characterize the pore types, quantify total porosity, obtain the porosity profile, analyze the pore and pore-throat size distribution, as well as to extract additional petrophysical parameters of different taphofacies from Morro do Chaves Formation coquinas, Sergipe-Alagoas basin. The results haven shown that taphofacies from shallow sub-environment under normal conditions (group T2) and deeper sub-environment under storm influence (group T5) are better in terms of reservoir quality. Nevertheless, rocks from storm influence, deeper sub-environments are more likely to represent a good reservoir, since its pore system is predominantly dominated by moldic pores, which are originated during eogenetic phase, while rocks from shallow normal conditions have pores dominantly generated during telogenesis. Additionally, μ-CT derived data such as coordination number and pore and pore-throat sizes could also be used to explain differences in absolute permeability in the studied rocks. Nevertheless, our data suggests that coquinas have a multiscale pore system and finer imaging scales are indispensable for more accurate petrophysical characterization. Keywords: Coquinas, μ-CT, petrophysics. RESUMO. A crescente utilização da microtomografia de raios-X (μ-CT) visando a caracterização das rochas reservatório pode ser explicada por diversos fatores, como sua natureza não-destrutiva, alta resolução espacial e visualização 3D do espaço poroso, que são propriedades exploradas nesse trabalho para avaliar o sistema poroso de coquinas, uma potencial rocha reservatório composta principalmente por conchas e seus respectivos fragmentos. Entretanto, a maioria dos estudos recentes não tem associado os parâmetros petrofísicos com as fácies de coquinas. Por essa razão, esse trabalho buscou realizar a caracterização dos tipos de poros, quantificar a porosidade total, obter o perfil de porosidade, analisar a distribuição do tamanho de poros e gargantas, assim como extrair parâmetros adicionais de diferentes tafofácies das coquinas da Fm. Morro do Chaves, Bacia de Sergipe-Alagoas. Os resultados mostraram que as tafofácies dos subambientes rasos sob condições normais de deposição (grupo T2) e dos subambientes profundos sob influência de tempestades (grupo T5) são melhores em termos de qualidade de reservatório. No entanto, as rochas de subambientes profundos sob influência de tempestades são mais prováveis de representarem bons reservatórios, pois seu sistema poroso é predominantemente dominado por poros móldicos, que são originados durante a fase eogenética, enquanto que as rochas depositadas no subambiente raso em condições normais possuem poros gerados durante a telogênese. Adicionalmente, dados derivados da μ-CT, como número de coordenação e tamanho de poros e gargantas, também poderiam ser usados para explicar as diferenças em permeabilidade absoluta nas rochas estudadas. Entretanto, nossos dados sugerem que as coquinas possuem um sistema poroso multiescalar e o imageamento em escalas mais finas para uma caracterização petrofísica mais acurada é indispensável.Palavras-chave: Coquinas, μ-CT, petrofísica

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X-ray microtomography application in pore space reservoir rock

Cited by 22 publications

References 8 publications

Optimization of image resolution parameters to characterize carbonate rocks through representative elementary volume analysis.

Optimization of image resolution parameters to characterize carbonate rocks through representative elementary volume analysis.

Characterization of carbonate rocks through X‐ray microfluorescence and X‐ray computed microtomography

Evaluation of Pore System Properties of Coquinas From Morro Do Chaves Formation by Means of X-Ray Microtomography

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