CO2-induced mechanical behaviour of Hawkesbury sandstone in the Gosford basin: an experimental study

Article


Rathnaweera, T. D., Ranjith, P. G., Perera, M. S. A., Haque, A., Lashin, A., Al Arifi, Nassir, Chandrasekharam, D., Yang, S. Q., Xu, T., Wang, S. H. and Yasar, E.. 2015. "CO2-induced mechanical behaviour of Hawkesbury sandstone in the Gosford basin: an experimental study." Materials Science and Engineering A. 641, pp. 123-137. https://doi.org/10.1016/j.msea.2015.05.029
Article Title

CO2-induced mechanical behaviour of Hawkesbury sandstone in the Gosford basin: an experimental study

ERA Journal ID201061
Article CategoryArticle
AuthorsRathnaweera, T. D. (Author), Ranjith, P. G. (Author), Perera, M. S. A. (Author), Haque, A. (Author), Lashin, A. (Author), Al Arifi, Nassir (Author), Chandrasekharam, D. (Author), Yang, S. Q. (Author), Xu, T. (Author), Wang, S. H. (Author) and Yasar, E. (Author)
Journal TitleMaterials Science and Engineering A
Journal of Materials Science and Engineering A
Journal Citation641, pp. 123-137
Number of Pages15
Year2015
Place of PublicationNetherlands
ISSN1934-8967
2161-6213
Digital Object Identifier (DOI)https://doi.org/10.1016/j.msea.2015.05.029
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0921509315005511?via%3Dihub
Abstract

Carbon dioxide (CO2) sequestered in saline aquifers undergoes a variety of chemically-coupled mechanical effects, which may cause CO2-induced mechanical changes and time-dependent reservoir deformation. This paper investigates the mineralogical and microstructural changes that occur in reservoir rocks following injection of CO2 in deep saline aquifers and the manner in which these changes influence the mechanical properties of the reservoir rocks. In this study, cylindrical sandstone specimens, 38mm in diameter and 76mm high, obtained from the Gosford basin, were used to perform a series of unconfined compressive strength (UCS) tests. Different saturation conditions: dry, water- and brine-saturated sandstone samples with and without scCO2 (super-critical carbon dioxide) injection, were considered in the study to obtain a comprehensive understanding of the impact of scCO2 injection during the CO2 sequestration process on saline aquifer mechanical properties.An acoustic emission (AE) system was employed to identify the stress threshold values of crack closure, crack initiation and crack damage for each testing condition during the whole deformation process of the specimens. Finally, scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray fluorescence (XRF) analyses were performed to evaluate the chemical and mineralogical changes that occur in reservoir rocks during CO2 injection. From the test results, it is clear that the CO2-saturated samples possessed a lower peak strength compared to non-CO2 saturated samples. According to SEM, XRD and XRF analyses, considerable quartz mineral corrosion and dissolution of calcite and siderite were observed during the interactions of the CO2/water/rock and CO2/brine/rock systems, which implies that mineralogical and geochemical rock alterations affect rock mechanical properties by accelerating the collapse mechanisms of the pore matrix. AE results also reveal the weakening effect of rock pore structure with CO2 injection, which suggests a significant effect of CO2 on failure mechanisms of the reservoir rock, with CO2 saturation showing a significant influence on crack initiation and crack damage stages.

KeywordsCOs sequestration, saline aquifers, strength, crack formation, microstructure, CO2 storage in Australia
ANZSRC Field of Research 2020419999. Other environmental sciences not elsewhere classified
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Byline AffiliationsMonash University
King Saud University, Saudi Arabia
Indian Institute of Technology, India
Northeastern University, China
Iskenderun Technical University, Turkiye
Institution of OriginUniversity of Southern Queensland
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