Intelligent framework for mineral segmentation and fluid-accessible surface area analysis in scanning electron microscopy

Asadi, Parisa; Beckingham, Lauren E.

doi:10.1016/j.apgeochem.2022.105387

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…As CO 2 dissolves into formation brine, the pH of the system is lowered. The resulting acidic conditions may favor the dissolution of primary minerals. − Dissolution of carbonate minerals, such as calcite or dolomite, can buffer the pH. As minerals dissolve, ions are released into solution such that conditions favoring precipitation of secondary minerals may develop.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Spatial and Temporal Evolution of Fractured Systems with a Heterogenous Mineralogy

Asadi,

Salek,

Beckingham

2024

ACS Earth Space Chem.

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Reactive transport modeling is a critical tool for elucidating the coupling among geochemical reactions, transport processes, and fracture permeability. This study explores the implications of preferential clay-rich regions near fracture surfaces of a Mancos shale sample on the reactive evolution of the fracture by using reactive transport simulations. These simulations utilized heterogeneous mineralogy data obtained from an in-depth analysis of a clay-rich region near the fracture surface, sourced from a mechanically induced fracture. We compared these simulations with counterparts assuming homogeneous mineral distributions based on bulk X-ray diffraction (XRD) data and prior imaging of the sample matrix. The results consistently show increased reactivity in cells near the inlet and fracture surface across all scenarios. The most significant changes in the porosity, mineral composition, and ion concentration occur in cells adjacent to the fracture at the system inlet. Comparative analysis reveals variations in mineral and porosity evolutions among the three systems. Over longer simulation periods, dissolution and porosity increase occur more rapidly in simulations, reflecting mineral heterogeneity, particularly within the clay-rich region near the fracture. A sensitivity analysis of mineral surface area (SA) values shows consistent trends using both low and high Brunauer−Emmett−Teller (BET) SA values over short time scales (days) but substantial disparities over longer time scales (years). These findings hold promise for improving our ability to predict the evolution of reactive fractures, with implications for subsurface CO 2 sequestration and oil recovery. In summary, this study advances our understanding of reactive transport in fractured systems, offering new avenues for predictive modeling.

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Section: Introductionmentioning

confidence: 99%

Modeling the Spatial and Temporal Evolution of Fractured Systems with a Heterogenous Mineralogy

Asadi,

Salek,

Beckingham

2024

ACS Earth Space Chem.

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“…Such hybrid (multiscale) models, however, still need an increase in the efficiency of coupling strategies, intending to combine the accuracy of pore-scale models and the computational efficiency of continuum-scale modeling (Battiato et al, 2011;Prasianakis et al, 2020;Scheibe et al, 2015;Tang et al, 2015). This used to be achieved by machine learning techniques with respect to decreasing computational time and interfacing various codes that operate at different length and time scales (Asadi & Beckingham, 2022;D'Elia et al, 2022;Deng et al, 2022;Menke et al, 2021;Prasianakis et al, 2020).…”

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confidence: 99%

Capturing the Dynamic Processes of Porosity Clogging

Lönartz,

Yang,

Deissmann

et al. 2023

Water Resources Research

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Understanding mineral precipitation induced porosity clogging and being able to quantify its non‐linear feedback on transport properties is fundamental for predicting the long‐term evolution of energy‐related subsurface systems. Commonly applied porosity‐diffusivity relations used in numerical simulations on the continuum‐scale predict the case of clogging as a final state. However, recent experiments and pore‐scale modeling investigations suggest dissolution‐recrystallization processes causing a non‐negligible inherent diffusivity of newly formed precipitates. To verify these processes, we present a novel microfluidic reactor design that combines time‐lapse optical microscopy and confocal Raman spectroscopy, providing real‐time insights of mineral precipitation induced porosity clogging under purely diffusive transport conditions. Based on 2D optical images, the effective diffusivity was determined as a function of the evolving porous media, using pore‐scale modeling. At the clogged state, Raman isotopic tracer experiments were conducted to visualize the transport of deuterium through the evolving microporosity of the precipitates, demonstrating the non‐final state of clogging. The evolution of the porosity‐diffusivity relationship in response to precipitation reactions shows a behavior deviating from Archie's law. The application of an extended power law improved the description of the evolving porosity‐diffusivity, but still neglected post‐clogging features. Our innovative combination of microfluidic experiments and pore‐scale modeling opens new possibilities to validate and identify relevant pore‐scale processes, providing data for upscaling approaches to derive key relationships for continuum‐scale reactive transport simulations.

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Substantiation of thermophysical action over electrode paste to achieve an even structure of electrodes of needle coke for thermal furnaces

Bazhin

Krylov

Sharikov

2023

jour

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The aim was to develop a procedure for obtaining an electrode paste of needle coke in case of thermophysical action in the extruder circuit to produce graphitized carbon electrodes with the required structure and properties for thermal furnaces. To study the properties and composition of electrode pastes and electrodes, X-ray powder diffraction, electron microscopy, infrared spectroscopy, and calorimetry analysis were used. To evaluate the electrode behavior upon its heating in a melt, mathematical and statistical analysis was used. The data were processed using standard MS Office programs. Experiments with graphitized carbon materials were conducted in a calorimetric laboratory at the Scientific Center for Problems of Processing Mineral and Man-Made Resources, Department of Metallurgy, Saint Petersburg Mining University (Russia), using a developed proprietary prototype of the extruder. The conditions and technological parameters for processing electrode pastes were defined and substantiated (rate of extrusion and electrode paste flow, pressure, and heating rate within the defined temperature range to achieve stable structural indicators of electrodes). According to XRD data, the proposed method of thermophysical processing of an electrode paste via a special extruder within 550–620°C and a die pressure of 60–80 MPa provides an evenly directed structure of needle coke with an average needle thickness of 12–20 nm and a length of needle phases of 5–10 mm. The behavior of electrode samples was examined in the furnace melt within 1500–1700°C. The obtained stable levels of the thermal-expansion coefficient (0.3·10-6 °C-1) and specific electrical resistance (4.5–6.0 μmOhm·m) were manifested in reduced electrode sublimation, low losses of overall weight at the electrode end, decreased oxidation, and reduced damage on its side. The proposed electrode structure ensures stable heat and electrical conductivity, as well as high heat capacity, which levels are equivalent to those of imported electrodes and electrode pastes.

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Intelligent framework for mineral segmentation and fluid-accessible surface area analysis in scanning electron microscopy

Cited by 5 publications

References 30 publications

Modeling the Spatial and Temporal Evolution of Fractured Systems with a Heterogenous Mineralogy

Modeling the Spatial and Temporal Evolution of Fractured Systems with a Heterogenous Mineralogy

Capturing the Dynamic Processes of Porosity Clogging

Substantiation of thermophysical action over electrode paste to achieve an even structure of electrodes of needle coke for thermal furnaces

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