Evaluation of representative elementary volume for a vuggy carbonate rock—Part: Porosity, permeability, and dispersivity

Vik, Bartek; Bastesen, Eivind; Skauge, Arne

doi:10.1016/j.petrol.2013.03.029

Cited by 65 publications

(32 citation statements)

References 31 publications

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“…Moreover, the representative elementary volume (REV) may also depend on the physical property under consideration (Vik, Bastesen, and Skauge 2013). If the microstructural model is heterogeneous as is usually the case for carbonate rocks, the simulated moduli are strongly controlled by the choice of the size of the model.…”

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confidence: 99%

“…The size of the model has to be several times larger than the size of the largest microstructural heterogeneity in order for the model to be representative. Moreover, the representative elementary volume (REV) may also depend on the physical property under consideration (Vik, Bastesen, and Skauge 2013). The issue of the choice of an adequate REV has been addressed in a number of papers (see Vik et al (2013) for a review).…”

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confidence: 99%

“…Moreover, the representative elementary volume (REV) may also depend on the physical property under consideration (Vik, Bastesen, and Skauge 2013). The issue of the choice of an adequate REV has been addressed in a number of papers (see Vik et al (2013) for a review). For instance, for a random pack of uniform glass beads, Clausnitzer and Hopmans (1999) found the minimum size of the representative volume to be approximately 5.15 times the diameter of the glass beads.…”

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Effect of supercritical CO₂ on carbonates: Savonnières sample case study

Shulakova

Sarout

Pimienta

et al. 2016

Geophysical Prospecting

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CO2 geosequestration is an efficient way to reduce greenhouse gas emissions into the atmosphere. Carbonate rock formations are one of the possible targets for CO2 sequestration due to their relative abundance and ability to serve as a natural trapping reservoir. The injected supercritical CO2 can change properties of the reservoir rocks such as porosity, permeability, tortuosity, and specific surface area due to dissolution and precipitation processes. This, in turn, affects the reservoir characteristics, i.e., their elastic properties, storage capacity, stability, etc. The tremendous progresses made recently in both microcomputed X‐ray tomography and high‐performance computing make numerical simulation of physical processes on actual rock microstructures feasible. However, carbonate rocks with their extremely complex microstructure and the presence of microporosity that is below the resolution of microcomputed X‐ray tomography scanners require novel, quite specific image processing and numerical simulation approaches. In the current work, we studied the effects of supercritical CO2 injection on microstructure and elastic properties of a Savonnières limestone. We used microtomographic images of two Savonnières samples, i.e., one in its natural state and one after injection and residence of supercritical CO2. A statistical analysis of the microtomographic images showed that the injection of supercritical CO2 led to an increase in porosity and changes of the microstructure, i.e., increase of the average volume of individual pores and decrease in the total number of pores. The CO2 injection/residence also led to an increase in the mean radii of pore throats, an increase in the length of pore network segments, and made the orientation distribution of mesopores more isotropic. Numerical simulations showed that elastic moduli for the sample subjected to supercritical CO2 injection/residence are lower than those for the intact sample.

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Effect of supercritical CO₂ on carbonates: Savonnières sample case study

Shulakova

Sarout

Pimienta

et al. 2016

Geophysical Prospecting

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“…The scale of the model should be optimized before simulation in order to reduce the consumption of time and computer memory. Therefore, we have utilized the representative elementary volume (REV) [23] method to implement the optimization by investigating the variety of porosity with the scale. The scale of REV can be determined when the porosity stops changing with the increase of model size.…”

Section: Reconstruction Of Core With X-ray Ctmentioning

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Physical Transport Properties of Porous Rock with Computed Tomography

Yue¹,

Wang²

2017

Computed Tomography - Advanced Applications

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In this chapter, three-dimensional digital rock models can be constructed by the micron X-ray computed tomography (CT). Then, lattice gas automata was applied to simulate the flow of electrical current in the saturated digital rocks to reveal the non-Archie relation of resistivity index and water saturation (I-Sw). The flow of single-phase Newtonian fluid in pore space had been studied with LBM for calculating the absolute permeability. Moreover, we have developed a model based on digital rock to simulate thermal neutrons transporting for imaging the anisotropy of pore structure. The advantages of the model over traditional methods indicate that it can simultaneously consider both the separation of matrix and pore and the distribution of mineral components. The results of numerical simulation with Monte Carlo are in good agreement with the pore distribution from X-ray CT, which can further verify the validity of the new model. In contrast to the conventional conclusion, we find that the porosity calculated with neutron data can be affected by the anisotropy. Therefore, a new formula to relate the resolution of array detectors to the quality of imaging, had been proposed to analyze the critical resolution and to optimize the number of neutrons in each simulation.

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“…By using CT, it is possible to render porosity from a sample volume, revealing the pore sizes and shapes while also allowing for investigating heterogeneity. The advance in tomographic data interpretation is associated with the application of image analysis methods, making it possible to quantify several rock parameters (Ketcham and Carlson, 2001;Van Geet et al, 2003;Vik et al, 2013).…”

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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.

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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.

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Evaluation of representative elementary volume for a vuggy carbonate rock—Part: Porosity, permeability, and dispersivity

Cited by 65 publications

References 31 publications

Effect of supercritical CO₂ on carbonates: Savonnières sample case study

Effect of supercritical CO₂ on carbonates: Savonnières sample case study

Physical Transport Properties of Porous Rock with Computed Tomography

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

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Evaluation of representative elementary volume for a vuggy carbonate rock—Part: Porosity, permeability, and dispersivity

Cited by 65 publications

References 31 publications

Effect of supercritical CO2 on carbonates: Savonnières sample case study

Effect of supercritical CO2 on carbonates: Savonnières sample case study

Physical Transport Properties of Porous Rock with Computed Tomography

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

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Product

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Effect of supercritical CO₂ on carbonates: Savonnières sample case study

Effect of supercritical CO₂ on carbonates: Savonnières sample case study