A microtomografia computadorizada de raios x integrada à petrografia no estudo tridimensional de porosidade em rochas

Neto, José Manoel dos Reis; Fiori, Angelo; Lopes, Angela Pacheco; Marchese, Clarice; Pinto-Coelho, Cristina Valle; Vasconcellos, Eleonora Maria Gouvêa; Silva, Gabriel Fischer da; Secchi, Rodrigo

doi:10.25249/0375-7536.2011413498508

Cited by 13 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several authors have presented many applications for the rock digital models generated from microCT data (Schmitt et al, 2015;Archilla et al, 2016;Soares et al, 2018;Oliveira & Soares, 2018). Reis-Neto et al (2011) quantify the porosity, the pore connectivity degree and the mineral composition of four samples of rocks from X-ray microtomography data and digital photographs of thin sections. The samples analyzed were of marble, quartzite, sandstone and dolomitic breccia.…”

Section: Introductionmentioning

confidence: 99%

Structural Characterization of Rocks Using the X-ray Microtomography Technique

Lima

Soares

2020

Anu. Inst. Geoc.

View full text Add to dashboard Cite

In this article are presented the results obtained for the determination of mineral composition and petrophysical properties of eight sedimentary rock samples through a proposed new method, which is supported by X-ray microtomography image analysis (microCT). The results are compared with their corresponding ones obtained by traditional techniques in order to assess the efficiency of the new method. Three samples of carbonate rocks and five of sandstone were used in this study. Two sandstone samples come from the Rio do Peixe basin (BRP, at northeastern Brazil) while the rest were extracted from USA basins. The best results were obtained in the quantification of the mineral composition of the rocks and, consequently, in the estimation of grain density. Due to its insufficient image resolution, the microtomography was sometimes unable to quantify very small pores, giving low porosity values. The correlation between bulk densities measured by the two methods shows an intermediate efficiency. Although the results presented here indicate that the microCT image analysis is appropriate for quantification of mineral phases, this technique has potential for determination of many other physical properties, such as mechanical, electrical and fluid flow rock properties.

show abstract

Section: Introductionmentioning

confidence: 99%

Structural Characterization of Rocks Using the X-ray Microtomography Technique

Lima

Soares

2020

Anu. Inst. Geoc.

View full text Add to dashboard Cite

show abstract

“…The combination of CT data with traditional petrographic analysis becomes an effective methodology for the study of carbonate rocks regarding porosity and diagenetic features (Okabe and Blunt, 2007;Reis Neto et al, 2011). Petrography is important to connect CT results to geological features and reduce mistakes in interpretation.…”

Section: Introductionmentioning

confidence: 99%

Petrophysical characterization of coquinas from Morro do Chaves Formation (Sergipe-Alagoas Basin) by x-ray computed tomography

Belila¹,

Kuroda²,

Souza³

et al. 2018

Geol. USP. Sér. cient.

View full text Add to dashboard Cite

Carbonate rocks constitute a large number of petroleum reservoirs worldwide. Notwithstanding, the characterization of these rocks is still a challenge due to their high complexity and pore space variability, indicating the importance of further studies to reduce uncertainty in reservoir interpretation and characterization. This work was performed for coquina samples from Morro do Chaves Formation (Sergipe-Alagoas Basin), analogous to important Brazilian reservoirs. Computed tomography (CT) was used for three-dimensional characterization of rock structure. The neural network named Self-Organizing Maps (SOM) was used for CT images segmentation. According to our tests, CT demonstrated to be a consistent tool for quantitative and qualitative analysis of heterogeneous pore space, by the evaluation of porosity, connectivity and the representative elementary volume.

show abstract

“…X-ray computed microtomography (µCT) is a non-destructive technique that allows the collection and analysis of hundreds of image sections enabling three-dimensional reconstruction and visualization of different types of porous media. Since µCT is a high-resolution computed tomography, it allows the quantification of areas and volumes of the internal structure of sedimentary rock, such as its pore system (Reis Neto et al, 2011;Leiderman et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Representative Elementary Volume of a Region of Interest of a Heterogeneous Carbonate Rock Using X-Ray Computed Microtomography and Numerical Simulation

Silva¹,

Rios²,

Hoerlle³

et al. 2018

Braz J Geophys

View full text Add to dashboard Cite

ABSTRACT. Characterization of carbonate rocks presents several challenges regarding the acquisition of petrophysical parameters and the understanding of fluid-flow dynamics in their pore system. To face these challenges, techniques such as X-ray microtomography, three-dimensional digital model reconstruction and fluid-flow numerical simulations have been continuously developed and improved. This study analyzes the representative elementary volume (REV) of a region of interest (ROI) of a highly heterogeneous stromatolite sample. Porosity and permeability are estimated for different subvolumes of the sample based on digital petrophysics. All necessary steps for reconstruction and segmentation of the complex pore system of the sample, as well as numerical simulations of fluid flow, are presented and discussed. The workflow is promising for reservoir evaluation because it can be applied to any type of carbonate rock.Keywords: Stromatolite, mCT, segmentation, REV, digital petrophysicsRESUMO. A caracterização de rochas carbonáticas apresenta diversos desafios quanto à determinação de seus parâmetros petrofísicos e o entendimento da dinâmica de escoamento de fluidos em seus sistemas porosos. Técnicas como a microtomografia de raios X, a modelagem digital tridimensional e a simulação numérica do escoamento de fluidos têm sido continuamente desenvolvidas e aprimoradas para superar esses desafios. Este estudo analisa o volume elementar representativo (REV) em uma região de interesse (ROI) de uma amostra de estromatólito altamente heterogênea. A porosidade e a permeabilidade são estimadas em diferentes subvolumes da amostra através da petrofísica digital. São apresentadas e discutidas todas as etapas necessárias para a reconstrução e segmentação do sistema poroso e a simulação numérica do escoamento de fluidos. A metodologia é promissora para avalição de reservatórios visto que o fluxo de trabalho pode ser aplicado a qualquer tipo de rocha carbonática.Palavras-chave: Estromatólitos, mCT, segmentação, REV, petrofísica digital

show abstract

A microtomografia computadorizada de raios x integrada à petrografia no estudo tridimensional de porosidade em rochas

Cited by 13 publications

References 21 publications

Structural Characterization of Rocks Using the X-ray Microtomography Technique

Structural Characterization of Rocks Using the X-ray Microtomography Technique

Petrophysical characterization of coquinas from Morro do Chaves Formation (Sergipe-Alagoas Basin) by x-ray computed tomography

Representative Elementary Volume of a Region of Interest of a Heterogeneous Carbonate Rock Using X-Ray Computed Microtomography and Numerical Simulation

Contact Info

Product

Resources

About