Pore anisotropy in shale and its dependence on thermal maturity and organic carbon content: A scanning SAXS study

Jitendra Bahadur; Debanjan Chandra; Avik Das; Vikram Vishal; Ashish Kumar Agrawal; Debasis Sen

doi:10.1016/j.coal.2023.104268

Pore anisotropy in shale and its dependence on thermal maturity and organic carbon content: A scanning SAXS study

Jitendra Bahadur^*, Debanjan Chandra, Avik Das, Vikram Vishal, Ashish Kumar Agrawal, Debasis Sen

^*Corresponding author for this work

Applied Geophysics and Petrophysics

Research output: Contribution to journal › Article › Scientific › peer-review

2 Citations (Scopus)

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Abstract

Pore orientation in shale governs the fluid transport properties that are key to hydrocarbon production and potential CO₂ sequestration. The present work deals with the detailed study of nano-heterogeneities in shales, across the bedding plane, of varying thermal maturity and total organic carbon content using scanning small-angle X-ray scattering (SAXS) experiments. The complementary X-ray Micro-Computed Tomography (μCT) and functional group mapping elucidate the heterogeneity in micrometer resolution. 2D SAXS profiles of the shales show elliptical patterns indicating the nanoscale pore anisotropy in shale. The orientation of pores and their spatial variation is strongly dependent on the content of organic matter. The variance in the anisotropy parameter is validated with chemical mapping and high-resolution 3D imaging.

Original language	English
Article number	104268
Number of pages	14
Journal	International Journal of Coal Geology
Volume	273
DOIs	https://doi.org/10.1016/j.coal.2023.104268
Publication status	Published - 2023

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

Anisotropy
FTIR
Heterogeneity
Shale
Small-angle X-ray scattering
X-ray CT

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10.1016/j.coal.2023.104268

Pore anisotropy in shale and its dependence on thermal maturity and organic carbon content: A scanning SAXS studyFinal published version, 11.3 MB

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title = "Pore anisotropy in shale and its dependence on thermal maturity and organic carbon content: A scanning SAXS study",

abstract = "Pore orientation in shale governs the fluid transport properties that are key to hydrocarbon production and potential CO2 sequestration. The present work deals with the detailed study of nano-heterogeneities in shales, across the bedding plane, of varying thermal maturity and total organic carbon content using scanning small-angle X-ray scattering (SAXS) experiments. The complementary X-ray Micro-Computed Tomography (μCT) and functional group mapping elucidate the heterogeneity in micrometer resolution. 2D SAXS profiles of the shales show elliptical patterns indicating the nanoscale pore anisotropy in shale. The orientation of pores and their spatial variation is strongly dependent on the content of organic matter. The variance in the anisotropy parameter is validated with chemical mapping and high-resolution 3D imaging.",

keywords = "Anisotropy, FTIR, Heterogeneity, Shale, Small-angle X-ray scattering, X-ray CT",

author = "Jitendra Bahadur and Debanjan Chandra and Avik Das and Vikram Vishal and Agrawal, {Ashish Kumar} and Debasis Sen",

note = "Green Open Access added to TU Delft Institutional Repository {\textquoteleft}You share, we take care!{\textquoteright} – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.",

year = "2023",

doi = "10.1016/j.coal.2023.104268",

language = "English",

volume = "273",

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T2 - A scanning SAXS study

AU - Bahadur, Jitendra

AU - Chandra, Debanjan

AU - Das, Avik

AU - Vishal, Vikram

AU - Agrawal, Ashish Kumar

AU - Sen, Debasis

N1 - Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

PY - 2023

Y1 - 2023

N2 - Pore orientation in shale governs the fluid transport properties that are key to hydrocarbon production and potential CO2 sequestration. The present work deals with the detailed study of nano-heterogeneities in shales, across the bedding plane, of varying thermal maturity and total organic carbon content using scanning small-angle X-ray scattering (SAXS) experiments. The complementary X-ray Micro-Computed Tomography (μCT) and functional group mapping elucidate the heterogeneity in micrometer resolution. 2D SAXS profiles of the shales show elliptical patterns indicating the nanoscale pore anisotropy in shale. The orientation of pores and their spatial variation is strongly dependent on the content of organic matter. The variance in the anisotropy parameter is validated with chemical mapping and high-resolution 3D imaging.

AB - Pore orientation in shale governs the fluid transport properties that are key to hydrocarbon production and potential CO2 sequestration. The present work deals with the detailed study of nano-heterogeneities in shales, across the bedding plane, of varying thermal maturity and total organic carbon content using scanning small-angle X-ray scattering (SAXS) experiments. The complementary X-ray Micro-Computed Tomography (μCT) and functional group mapping elucidate the heterogeneity in micrometer resolution. 2D SAXS profiles of the shales show elliptical patterns indicating the nanoscale pore anisotropy in shale. The orientation of pores and their spatial variation is strongly dependent on the content of organic matter. The variance in the anisotropy parameter is validated with chemical mapping and high-resolution 3D imaging.

KW - Anisotropy

KW - FTIR

KW - Heterogeneity

KW - Shale

KW - Small-angle X-ray scattering

KW - X-ray CT

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DO - 10.1016/j.coal.2023.104268

M3 - Article

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VL - 273

JO - International Journal of Coal Geology

JF - International Journal of Coal Geology

M1 - 104268

ER -

Pore anisotropy in shale and its dependence on thermal maturity and organic carbon content: A scanning SAXS study

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Keywords

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