A novel upscaling procedure for characterising heterogeneous shale porosity from nanometer-to millimetre-scale in 3D

Lin Ma, Patrick Dowey, Ernest Rutter, Kevin Taylor, Peter Lee

    Research output: Contribution to journalArticlepeer-review

    112 Downloads (Pure)

    Abstract

    Microstructures and pore systems in shales are key to understanding the role of shale in many energy applications. This study proposes a novel multi-stage upscaling procedure to comprehensively investigate the heterogeneous and complex microstructures and pore systems in a laminated and microfractured shale, utilizing 3D multi-scale imaging data. Five imaging techniques were used for characterisation from sub-nanoscale to macroscale (core-scale), spanning four orders of magnitude. Image data collected using X-ray tomography, Focused Ion Beam, and Electron Tomography techniques range in voxel size from 0.6 nm to 13 μm.

    Prior to upscaling, a novel two-step analysis was performed to ensure sub-samples were representative. Following this, a three-step procedure, based on homogenising descriptors and computed volume coefficients, was used to upscale the quantified microstructure and pore system. At the highest resolution (nanoscale), four distinct pore types were identified. At the sub-micron scale equations were derived for three pore-associated phases. At the microscale, the volume coefficients were recalculated to upscale the pore system to the macroscale (millimetre). The accuracy of the upscaling methodology was verified, predicting the total porosity within 7.2% discrepancy. The results provide a unique perspective to understand heterogeneous rock types, breaking though prior scale limitations in the pore system.
    Original languageEnglish
    Pages (from-to)1285-1297
    JournalEnergy
    Volume181
    Early online date5 Jun 2019
    DOIs
    Publication statusPublished - 5 Jun 2019

    Fingerprint

    Dive into the research topics of 'A novel upscaling procedure for characterising heterogeneous shale porosity from nanometer-to millimetre-scale in 3D'. Together they form a unique fingerprint.

    Cite this