Multi-scale characterization of pore evolution in a combustion metamorphic complex, Hatrurim basin, Israel: Combining (ultra) small-angle neutron scattering and image analysis

Wang, Hsiu-Wen; Anovitz, Lawrence M.; Burg, Avihu; Cole, David R.; Allard, Lawrence F.; Jackson, Andrew; Stack, Andrew G.; Rother, Gernot

doi:10.1016/j.gca.2013.07.034

Cited by 40 publications

(50 citation statements)

References 43 publications

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“…Additional details of the data reduction procedures for both neutron scattering and the use of imagery may be found in (Anovitz et al, 2009, Anovitz et al, 2013, Anovitz and Cole, 2015, Wang et al, 2013.…”

Section: Sans/usansmentioning

confidence: 99%

Evaluation of accessible mineral surface areas for improved prediction of mineral reaction rates in porous media

Beckingham

Steefel

Swift

et al. 2017

Geochimica et Cosmochimica Acta

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121

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The rates of mineral dissolution reactions in porous media are difficult to predict, in part because of a lack of understanding of mineral reactive surface area in natural porous media. Common estimates of mineral reactive surface area used in reactive transport models for porous media are typically ad hoc and often based on average grain size, increased to account for surface roughness or decreased by several orders of magnitude to account for reduced surface reactivity of field as opposed to laboratory samples. In this study, accessible mineral surface areas are determined for a sample from the reservoir formation at the Nagaoka pilot CO2 injection site (Japan) using a multi-scale image analysis based on synchrotron Xray microCT, SEMQEMSCAN, XRD, SANS, and FIB-SEM. This analysis not only accounts for accessibility of mineral surfaces to macro-pores, but also accessibility through connected micro-pores in smectite, the most abundant clay mineral in this sample. While the imaging analysis reveals that most of the micro-and macro-pores are well connected, some pore regions are unconnected and thus inaccessible to fluid flow and diffusion. To evaluate whether mineral accessible surface area accurately reflects reactive surface area a flow-through core experiment is performed and modeled at the continuum scale. The core experiment is performed under conditions replicating the pilot site and the evolution of effluent solutes in the aqueous phase is tracked.Various reactive surface area models are evaluated for their ability to capture the observed effluent chemistry, beginning with parameter values determined as a best fit to a disaggregated sediment experiment (Beckingham et al., 2016) described previously.Simulations that assume that all mineral surfaces are accessible (as in the disaggregated sediment experiment) over-predict the observed mineral reaction rates, suggesting that a reduction of RSA by a factor of 10-20 is required to match the core flood experimental data. While the fit of the effluent chemistry (and inferred mineral dissolution rates) greatly improve when the pore-accessible mineral surface areas are used, it was also necessary to include highly reactive glass phases to match the experimental observations, in agreement with conclusions from the disaggregated sediment experiment. It is hypothesized here that the 10-20 reduction in reactive surface areas based on the limited pore accessibility of reactive phases in core flood experiment may be reasonable for poorly sorted and cemented sediments like those at the Nagaoka site, although this reflects pore rather than larger scale heterogeneity.

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Section: Sans/usansmentioning

confidence: 99%

Evaluation of accessible mineral surface areas for improved prediction of mineral reaction rates in porous media

Beckingham

Steefel

Swift

et al. 2017

Geochimica et Cosmochimica Acta

Self Cite

121

View full text Add to dashboard Cite

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“…Wang et al (2013) detected a reduced (relative) contribution to the total porosity from small scale pores in metamorphic rocks that underwent higher degrees of metamorphism. This implies that smaller pores tended to close fi rst during the combustion and other metamorphic processes the rocks underwent over time.…”

Section: Observations Of Precipitation In Poresmentioning

confidence: 97%

“…Recent work has shown that small and ultra-small angle neutron and X-ray scattering can be combined with, e.g., traditional SEM-BSE analysis to obtain a measurement of pore sizes that range seven orders of magnitude (Wang et al 2013). This series of techniques removes one of the issues with the pore size characterization techniques described above in that the sample is not ground to a powder.…”

Section: Observations Of Precipitation In Poresmentioning

confidence: 99%

Precipitation in Pores: A Geochemical Frontier

Stack

2015

Reviews in Mineralogy and Geochemistry

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“…Standard petrographic techniques, such as backscattering SEM, and TEM cover only certain ranges of length scales (Fig. 7.7), and quantification of pore structures for thin-section-sized samples is difficult, especially at high image resolutions [80].…”

Section: Structure Of Sedimentary Rocksmentioning

confidence: 99%

“…Surface fractal dimension is a sample specific parameter. It can vary even for similar rocks, which suggests that structures of pore/grain interfaces depend on the detailed history of a given rock, as well as on the materials forming the interfaces [80]. Both surface and mass fractal structures have been documented, the latter describing the statistical distribution of pores within the sample.…”

Section: Structure Of Sedimentary Rocksmentioning

confidence: 99%

Structural Characterization of Porous Materials Using SAS

Melnichenko

2016

Small-Angle Scattering From Confined and Interfacial Fluids

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This chapter begins with an overview of various engineered and naturally occurring porous solids and their applications in modern technologies. Different modes of confinement, such as topological, chemical, biological, and interfacial, can affect structural and kinetic aspects of the fluid phase equilibria, mechanical and viscoelastic properties, diffusion, and flow in confined spaces. Such dramatic modification of the fluid properties under confinement can be efficiently exploited in a variety of technologies, provided there are ways of controlling the internal structures and surface chemistry of the target porous material at the macroscopic, mesoscopic, microscopic, and molecular levels. SAS represents a nonintrusive technique that can provide information on the structure of porous media that is inaccessible to other methods of structural characterization. The rest of the chapter is devoted to the description of SAS structural analysis of porous silicas, carbons, membranes, polymer monoliths, sedimentary rocks and other common materials.

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Multi-scale characterization of pore evolution in a combustion metamorphic complex, Hatrurim basin, Israel: Combining (ultra) small-angle neutron scattering and image analysis

Cited by 40 publications

References 43 publications

Evaluation of accessible mineral surface areas for improved prediction of mineral reaction rates in porous media

Evaluation of accessible mineral surface areas for improved prediction of mineral reaction rates in porous media

Precipitation in Pores: A Geochemical Frontier

Structural Characterization of Porous Materials Using SAS

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