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

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Title CO2-induced mechanical behaviour of Hawkesbury sandstone in the Gosford basin: An experimental study
 
Creator RATHNAWEERA, TD
RANJITH, PG
PERERA, MSA
HAQUE, A
LASHIN, A
AL ARIFI, N
CHANDRASEKHARAM, D
YANG, SQ
XU, T
WANH, SH
YASAR, E
 
Subject DEEP-SALINE AQUIFERS
CO2 SEQUESTRATION
CARBON-DIOXIDE
DISSOLUTION KINETICS
AQUEOUS-SOLUTIONS
STORAGE
SOLUBILITY
PRESSURE
MODEL
WATER
CO2 sequestration
Saline aquifers
Strength
Crack formation
Microstructure
CO2 storage in Australia
 
Description 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, 38 mm in diameter and 76 mm high, obtained from the Gosford basin, were used to perform a series of un-confined compressive strength (UCS) tests. Different saturation conditions: dry, water- and brine-saturated sandstone samples with and without scCO(2) (super-critical carbon dioxide) injection, were considered in the study to obtain a comprehensive understanding of the impact of scCO(2) 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. (C) 2015 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2016-01-15T04:42:54Z
2016-01-15T04:42:54Z
2015
 
Type Article
 
Identifier MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 641,123-137
0921-5093
1873-4936
http://dx.doi.org/10.1016/j.msea.2015.05.029
http://dspace.library.iitb.ac.in/jspui/handle/100/17786
 
Language en