Correlative core- to pore-scale imaging of shales

Goral, Jan; Andrew, Matthew; Olson, Terrilyn M.; Deo, Milind

doi:10.1016/j.marpetgeo.2019.08.009

Cited by 45 publications

(24 citation statements)

References 10 publications

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“…This assumption provides a way of effectively predicting the behaviour of macroscopic variable of the entire volume from the REV. Sometimes, multi-scale imaging is used especially for highly heterogeneous rocks as the smallest pores determine the resolution to be used for optimal imaging (Goral et al 2020). Upscaling has also been used in different researches to circumvent this challenge (Long et al 2016;Piller et al 2014;Mehmani et al 2020).…”

Section: Pore Geometry Propertiesmentioning

confidence: 99%

Effect of CO2 Phase on Pore Geometry of Saline Reservoir Rock

et al. 2022

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The phase of CO2 present in a saline reservoir influences the change of the pore geometry properties of reservoir rocks and consequently the transport and storage integrity of the reservoir. In this study, digital rock physics was used to evaluate pore geometry properties of rocks saturated with the different phaseCO2-brine under reservoir conditions. The changes in the pore geometry properties due to the different phaseCO2-brine-rock interaction were quantified. In addition to compression, CO2-brine-rock interaction caused a further reduction in porosity by precipitation. Compared to the dry sample, the porosity of the gaseous CO2-br sample was reduced the most, and was lower by 15% after saturation and compression. There was reduction in the pre-compression porosity after compression for all the samples, however, the reduction was highest in the gaseous CO2-br-saturated sample (13%). The flatness of pore surfaces was reduced, and pores became less rounded after compression, especially in supercritical CO2-br-saturated rock. The results from this research provide a valuable input to guide a robust simulation of CO2 storage in reservoir rocks where different phases of CO2 could be present.

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Section: Pore Geometry Propertiesmentioning

confidence: 99%

Effect of CO2 Phase on Pore Geometry of Saline Reservoir Rock

et al. 2022

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“…Porosity and permeability of shales are often determined by examining core rock samples recovered from oil/gas wells drilled deep into rock formation. Recently, modern 2D/3D imaging techniques, have been used to investigate mineralogy and porosity in very fine detail, down to the sub-nanometer level [1][2][3][4] . These methods (and advanced image analysis) have facilitated characterization of the pore morphology within both the organic matter and non-organic (mineral) matrix of shales [5][6][7][8][9][10][11][12][13][14] .…”

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confidence: 99%

Confinement Effect on Porosity and Permeability of Shales

Goral

Panja

Deo

et al. 2020

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Porosity and permeability are the key factors in assessing the hydrocarbon productivity of unconventional (shale) reservoirs, which are complex in nature due to their heterogeneous mineralogy and poorly connected nano-and micro-pore systems. Experimental efforts to measure these petrophysical properties posse many limitations, because they often take weeks to complete and are difficult to reproduce. Alternatively, numerical simulations can be conducted in digital rock 3D models reconstructed from image datasets acquired via e.g., nanoscale-resolution focused ion beam-scanning electron microscopy (FIB-SEM) nano-tomography. In this study, impact of reservoir confinement (stress) on porosity and permeability of shales was investigated using two digital rock 3D models, which represented nanoporous organic/mineral microstructure of the Marcellus Shale. Five stress scenarios were simulated for different depths (2,000-6,000 feet) within the production interval of a typical oil/gas reservoir within the Marcellus Shale play. Porosity and permeability of the pre-and post-compression digital rock 3D models were calculated and compared. A minimal effect of stress on porosity and permeability was observed in both 3D models. These results have direct implications in determining the oil-/gas-in-place and assessing the production potential of a shale reservoir under various stress conditions.

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“…Due to the limited analytical scales, 3D reconstruction results are sometimes not fully representative of the actual complex and highly heterogeneous structure of rocks. It is therefore necessary to combine X-ray computed tomography and SEM mosaic images for statistical analysis from micron to nanometer scale [ 91 , 92 ]. Therefore, a balance should be found between “resolution” and “analytical scale” during the research of materials such as oil shale.…”

Section: Applications Of the Fib-sem Systemmentioning

confidence: 99%

Application of FIB-SEM Techniques for the Advanced Characterization of Earth and Planetary Materials

Wang

Tang

et al. 2020

Scanning

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Advanced microanalytical techniques such as high-resolution transmission electron microscopy (HRTEM), atom probe tomography (APT), and synchrotron-based scanning transmission X-ray microscopy (STXM) enable one to characterize the structure and chemical and isotopic compositions of natural materials down towards the atomic scale. Dual focused ion beam-scanning electron microscopy (FIB-SEM) is a powerful tool for site-specific sample preparation and subsequent analysis by TEM, APT, and STXM to the highest energy and spatial resolutions. FIB-SEM also works as a stand-alone technique for three-dimensional (3D) tomography. In this review, we will outline the principles and challenges when using FIB-SEM for the advanced characterization of natural materials in the Earth and Planetary Sciences. More specifically, we aim to highlight the state-of-the-art applications of FIB-SEM using examples including (a) traditional FIB ultrathin sample preparation of small particles in the study of space weathering of lunar soil grains, (b) migration of Pb isotopes in zircons by FIB-based APT, (c) coordinated synchrotron-based STXM characterization of extraterrestrial organic material in carbonaceous chondrite, and finally (d) FIB-based 3D tomography of oil shale pores by slice and view methods. Dual beam FIB-SEM is a powerful analytical platform, the scope of which, for technological development and adaptation, is vast and exciting in the field of Earth and Planetary Sciences. For example, dual beam FIB-SEM will be a vital technique for the characterization of fine-grained asteroid and lunar samples returned to the Earth in the near future.

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Correlative core- to pore-scale imaging of shales

Cited by 45 publications

References 10 publications

Effect of CO2 Phase on Pore Geometry of Saline Reservoir Rock

Effect of CO2 Phase on Pore Geometry of Saline Reservoir Rock

Confinement Effect on Porosity and Permeability of Shales

Application of FIB-SEM Techniques for the Advanced Characterization of Earth and Planetary Materials

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