Pore anisotropy in shale and its dependence on thermal maturity and organic carbon content

A scanning SAXS study

Journal article (2023)

Authors

Jitendra Bahadur Bhabha Atomic Research Centre, Homi Bhabha National Institute, Mumbai
D. Chandra Applied Geophysics and Petrophysics - CEG
Avik Das Bhabha Atomic Research Centre
Vikram Vishal Indian Institute of Technology Bombay
Ashish Kumar Agrawal Bhabha Atomic Research Centre
Debasis Sen Bhabha Atomic Research Centre, Homi Bhabha National Institute, Mumbai
Research Group
Applied Geophysics and Petrophysics (CEG) (TU Delft)
Copyright: © 2023 Jitendra Bahadur, D. Chandra, Avik Das, Vikram Vishal, Ashish Kumar Agrawal, Debasis Sen
DOI: https://doi.org/10.1016/j.coal.2023.104268
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Published Date

2023

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Geoscience and Engineering

Research Group

Applied Geophysics and Petrophysics

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.

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