Grain boundary networks and shape preferred orientation – A fresh angle on pattern quantification with GBPaQ

Heeb, Johanna; Healy, David; Timms, Nicholas E.; Gomez‐Rivas, Enrique

doi:10.1016/j.cageo.2023.105311

Computers & Geosciences

2023

DOI: 10.1016/j.cageo.2023.105311

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Grain boundary networks and shape preferred orientation – A fresh angle on pattern quantification with GBPaQ

Johanna Heeb

David Healy

Nicholas E. Timms

et al.

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2024

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Effect of microvariability on electrical rock properties

Börner,

Menzel,

Scheunert

2024

Geophysical Journal International

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Summary In petrophysics, physical rock properties are typically established through laboratory measurements of individual samples. These measurements predominantly relate to the specific sample and can be challenging to associate with the rock as a whole since the physical attributes are heavily reliant on the microstructure, which can vary significantly in different areas. Thus, the obtained values have limited applicability to the entirety of the original rock mass. To examine the dependence of petrophysical measurements based on the variable microstructure, we generate sets of random 2D microstructure representations for a sample, taking into account macroscopic parameters such as porosity and mean grain size. For each microstructure produced, we assess the electrical conductivity and evaluate how it is dependent on the microstructure’s variability. The developed workflow including microstructure modelling, finite element simulation of electrical conductivity as well as statistical and petrophysical evaluation of the results is presented. We show that the methodology can adequately mimic the physical behaviour of real rocks, showing consistent emulation of the dependence of electrical conductivity on connected porosity according to Archie’s law across different types of pore space (micro-fracture, inter-granular, and vuggy, oomoldic pore space). Furthermore, properties such as the internal surface area and its fractal dimension as well as the electrical tortuosity are accessible for the random microstructures and show reasonable behaviour. Finally, the possibilities, challenges and meshing strategies for extending the methodology to 3D microstructures are discussed.

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Effect of microvariability on electrical rock properties

Börner,

Menzel,

Scheunert

2024

Geophysical Journal International

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show abstract

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Grain boundary networks and shape preferred orientation – A fresh angle on pattern quantification with GBPaQ

Cited by 1 publication

References 61 publications

Effect of microvariability on electrical rock properties

Effect of microvariability on electrical rock properties

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