Digital core analysis and pore network modeling of CO2 flow and trapping in the Otway Basin

Author Identifier (ORCID)

Masoud Aslannezhad: https://orcid.org/0000-0002-7113-7341

Stefan Iglauer: https://orcid.org/0000-0002-8080-1590

Alireza Keshavarz: https://orcid.org/0000-0002-8091-961X

Abstract

This research utilizes three-dimensional pore-scale imaging of cores from the Paaratte Sandstone in the Otway Basin, obtained through micro-CT, to investigate CO2storage potential and multiphase flow characteristics. Capillary trapping, a critical mechanism for CO2storage, was thoroughly examined in the context of CO2-brine displacement in a water-wet system. Using pore-scale modeling, drainage and imbibition curves were generated to determine key parameters, including initial and residual saturations, drainage and imbibition capillary pressures, and relative permeability for CRC-8 rock types. A comprehensive assessment of uncertainties and sensitivities is also included in the analysis. Model-generated curves enabled an exploration of the impact of variables such as wettability and initial water saturation, providing valuable insight into the sensitivity of CO2trapping mechanisms. Notably, our model allowed for an exploration of sensitivity to contact angle, showing that increased contact angles correspond to a reduction in residual trapping. This study’s results underscore the potential of digital rock technology for enhancing understanding of geological CO2storage. Through high-resolution imaging, experimental measurements, and pore network modeling, insights into the key mechanisms influencing CO2trapping and multiphase flow in reservoir rocks were gained, providing a foundation for improved reservoir characterization and modeling.

Document Type

Journal Article

Date of Publication

8-14-2025

Volume

39

Issue

32

Publication Title

Energy and Fuels

Publisher

ACS

School

Centre for Sustainable Energy and Resources / School of Engineering

Funders

CO2CRC Ltd / Edith Cowan University

Comments

Aslannezhad, M., Tang, D., Bason, D., Gomez, L., Iglauer, S., & Keshavarz, A. (2025). Digital core analysis and pore network modeling of CO2 flow and trapping in the Otway Basin. Energy & Fuels, 39(32), 15369–15385. https://doi.org/10.1021/acs.energyfuels.5c02672

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First Page

15369

Last Page

15385

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Link to publisher version (DOI)

10.1021/acs.energyfuels.5c02672