Evolution of pore-scale morphology of oil shale during pyrolysis - a quantitative analysis

Todor Baychev; Arash Rabbani; Shahab Ayatollahi; Andrey Jivkov

doi:10.1007/s11242-017-0877-1

Evolution of pore-scale morphology of oil shale during pyrolysis - a quantitative analysis

Todor Baychev, Arash Rabbani, Shahab Ayatollahi, Andrey Jivkov

Sharif University of Technology

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Abstract

Changes of morphological parameters of oil shale under thermal conditions are investigated. Analyses are based on 26 micro-computed tomography (micro-CT) images of Green River immature shale rock available under creative commons license. Several image-processing and characterisation algorithms are applied to sequential high-resolution micro-CT images of oil shale samples undergoing pyrolysis. Pore-scale morphology is extracted and quantified, providing results for pore size, throat size, grain size, specific surface, coordination number, and fracture aperture. The results demonstrate critical increases of porosity, coordination number and fracture aperture in the temperature range from 390 to 400 °C, which translates into step change in the transport properties of the shale after pyrolysis. It is further observed, that the coordination spectrum, the pore and throat size distributions, become smoother during the pyrolysis process. The morphological characteristics presented here enable advanced microstructure-informed approaches to pore-scale modelling of transport for optimising oil production.

Original language	English
Pages (from-to)	143-162
Number of pages	20
Journal	Transport in Porous Media
Volume	119
Issue number	1
Early online date	1 Jun 2017
DOIs	https://doi.org/10.1007/s11242-017-0877-1
Publication status	Published - 1 Aug 2017

Keywords

Micro computed tomography
pyrolysis
coordination number
pore and throat size
fracture aperture
morphology

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10.1007/s11242-017-0877-1

Manuscript-AcceptedAccepted author manuscript, 8.56 MB

MaPoS: Mechanics and Physics of Solids
Jivkov, A. (PI), Katnam, K.-B. (CoI), Lazarov, B. (CoI), Margetts, L. (CoI), Boom, P. (CoI), Borodin, E. (CoI), Kosmas, O. (CoI), Baychev, T. (PGR student), Chen, T. (PGR student), Farrokhnia, A. (PGR student), Ford, M. (PGR student), He, L. (PGR student), Hewitt, S. (PGR student), Li, X. (PGR student), Marshall, O. (PGR student), Song, Z. (PGR student), Tsamos, A. (PGR student) & Wang, J. (PGR student)
Project: Research

Cite this

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title = "Evolution of pore-scale morphology of oil shale during pyrolysis - a quantitative analysis",

abstract = "Changes of morphological parameters of oil shale under thermal conditions are investigated. Analyses are based on 26 micro-computed tomography (micro-CT) images of Green River immature shale rock available under creative commons license. Several image-processing and characterisation algorithms are applied to sequential high-resolution micro-CT images of oil shale samples undergoing pyrolysis. Pore-scale morphology is extracted and quantified, providing results for pore size, throat size, grain size, specific surface, coordination number, and fracture aperture. The results demonstrate critical increases of porosity, coordination number and fracture aperture in the temperature range from 390 to 400 °C, which translates into step change in the transport properties of the shale after pyrolysis. It is further observed, that the coordination spectrum, the pore and throat size distributions, become smoother during the pyrolysis process. The morphological characteristics presented here enable advanced microstructure-informed approaches to pore-scale modelling of transport for optimising oil production.",

keywords = "Micro computed tomography, pyrolysis, coordination number, pore and throat size, fracture aperture, morphology",

author = "Todor Baychev and Arash Rabbani and Shahab Ayatollahi and Andrey Jivkov",

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doi = "10.1007/s11242-017-0877-1",

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AU - Baychev, Todor

AU - Rabbani, Arash

AU - Ayatollahi, Shahab

AU - Jivkov, Andrey

PY - 2017/8/1

Y1 - 2017/8/1

N2 - Changes of morphological parameters of oil shale under thermal conditions are investigated. Analyses are based on 26 micro-computed tomography (micro-CT) images of Green River immature shale rock available under creative commons license. Several image-processing and characterisation algorithms are applied to sequential high-resolution micro-CT images of oil shale samples undergoing pyrolysis. Pore-scale morphology is extracted and quantified, providing results for pore size, throat size, grain size, specific surface, coordination number, and fracture aperture. The results demonstrate critical increases of porosity, coordination number and fracture aperture in the temperature range from 390 to 400 °C, which translates into step change in the transport properties of the shale after pyrolysis. It is further observed, that the coordination spectrum, the pore and throat size distributions, become smoother during the pyrolysis process. The morphological characteristics presented here enable advanced microstructure-informed approaches to pore-scale modelling of transport for optimising oil production.

AB - Changes of morphological parameters of oil shale under thermal conditions are investigated. Analyses are based on 26 micro-computed tomography (micro-CT) images of Green River immature shale rock available under creative commons license. Several image-processing and characterisation algorithms are applied to sequential high-resolution micro-CT images of oil shale samples undergoing pyrolysis. Pore-scale morphology is extracted and quantified, providing results for pore size, throat size, grain size, specific surface, coordination number, and fracture aperture. The results demonstrate critical increases of porosity, coordination number and fracture aperture in the temperature range from 390 to 400 °C, which translates into step change in the transport properties of the shale after pyrolysis. It is further observed, that the coordination spectrum, the pore and throat size distributions, become smoother during the pyrolysis process. The morphological characteristics presented here enable advanced microstructure-informed approaches to pore-scale modelling of transport for optimising oil production.

KW - Micro computed tomography

KW - pyrolysis

KW - coordination number

KW - pore and throat size

KW - fracture aperture

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JO - Transport in Porous Media

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Evolution of pore-scale morphology of oil shale during pyrolysis - a quantitative analysis

Abstract

Keywords

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MaPoS: Mechanics and Physics of Solids

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